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Document and Entity Information - USD ($) $ in Billions	12 Months Ended
Document and Entity Information - USD ($) $ in Billions	Jan. 31, 2018	Mar. 12, 2018	Jul. 31, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	AUTODESK INC.
Entity Central Index Key	0000769397
Current Fiscal Year End Date	--01-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Jan. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		218,327,862
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 24.2

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Net revenue:
Maintenance	$ 989.6	$ 1,103.1	$ 1,152.5
Subscription	894.3	443.1	228.1
Total maintenance and subscription revenue	1,883.9	1,546.2	1,380.6
License and other	172.7	484.8	1,123.5
Total net revenue	2,056.6	2,031.0	2,504.1
Cost of revenue:
Cost of maintenance and subscription revenue	214.4	191.7	162.3
Cost of license and other revenue	72.6	110.2	159.4
Amortization of developed technology	16.4	40.0	49.0
Total cost of revenue	303.4	341.9	370.7
Gross profit	1,753.2	1,689.1	2,133.4
Operating expenses:
Marketing and sales	1,087.3	1,022.5	1,015.5
Research and development	755.5	766.1	790.0
General and administrative	305.2	287.8	293.4
Amortization of purchased intangibles	20.2	31.8	33.2
Restructuring charges and other facility exit costs, net	94.1	80.5	0.0
Total operating expenses	2,262.3	2,188.7	2,132.1
(Loss) income from operations	(509.1)	(499.6)	1.3
Interest and other expense, net	(48.2)	(24.2)	(21.6)
Loss before income taxes	(557.3)	(523.8)	(20.3)
Provision for income taxes	(9.6)	(58.3)	(310.2)
Net loss	$ (566.9)	$ (582.1)	$ (330.5)
Basic net loss per share (usd per share)	$ (2.58)	$ (2.61)	$ (1.46)
Diluted net loss per share (usd per share)	$ (2.58)	$ (2.61)	$ (1.46)
Weighted average shares used in computing basic net loss per share (in shares)	219.5	222.7	226.0
Weighted average shares used in computing diluted net loss per share (in shares)	219.5	222.7	226.0

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Statement of Comprehensive Income [Abstract]
Net loss	$ (566.9)	$ (582.1)	$ (330.5)
Other comprehensive loss, net of reclassifications:
Net loss on derivative instruments (net of tax effect of $3.2, ($1.1), and $0.6)	(31.2)	(1.1)	(27.1)
Change in net unrealized (loss) gain on available-for-sale securities (net of tax effect of $0.1, ($0.5), and $0.0)	(0.2)	1.3	(1.4)
Change in defined benefit pension items (net of tax effect of ($0.7), ($0.9), and $0.9)	4.5	(5.5)	(4.6)
Net change in cumulative foreign currency translation gain (loss) (net of tax effect of ($4.8), $0.2, and $0.5)	81.6	(52.1)	(34.7)
Total other comprehensive income (loss)	54.7	(57.4)	(67.8)
Total comprehensive loss	$ (512.2)	$ (639.5)	$ (398.3)

CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parentheticals) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Statement of Comprehensive Income [Abstract]
Net gain (loss) on derivative instruments, tax	$ 3.2	$ (1.1)	$ 0.6
Change in net unrealized (loss) gain on available-for-sale securities, tax	0.1	(0.5)	0.0
Change in unfunded portion of pension plans, tax	(0.7)	(0.9)	0.9
Net change in cumulative foreign currency translation gain (loss), tax	$ (4.8)	$ 0.2	$ 0.5

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Jan. 31, 2018	Jan. 31, 2017
Current assets:
Cash and cash equivalents	$ 1,078.0	$ 1,213.1
Marketable securities	245.2	686.8
Accounts receivable, net	438.2	452.3
Prepaid expenses and other current assets	116.5	108.4
Total current assets	1,877.9	2,460.6
Marketable securities	190.8	306.2
Computer equipment, software, furniture, and leasehold improvements, net	145.0	158.6
Developed technologies, net	27.1	45.7
Goodwill	1,620.2	1,561.1
Deferred income taxes, net	81.7	63.9
Other assets	170.9	202.0
Total assets	4,113.6	4,798.1
Current liabilities:
Accounts payable	94.7	93.5
Accrued compensation	250.9	238.2
Accrued income taxes	28.0	50.0
Deferred revenue	1,551.6	1,270.1
Current portion of long-term notes payable, net	0.0	398.7
Other accrued liabilities	198.0	134.9
Total current liabilities	2,123.2	2,185.4
Long-term deferred revenue	403.5	517.9
Long-term income taxes payable	41.6	39.3
Long-term deferred income taxes	66.6	91.5
Long-term notes payable, net	1,586.0	1,092.0
Long-term other liabilities	148.7	138.4
Commitments and contingencies
Stockholders’ (deficit) equity:
Preferred stock, $0.01 par value; shares authorized 2.0; none issued or outstanding at January 31, 2018 and 2017	0.0	0.0
Common stock and additional paid-in capital, $0.01 par value; shares authorized 750.0; 218.3 outstanding at January 31, 2018 and 220.3 outstanding at January 31, 2017	1,952.7	1,876.3
Accumulated other comprehensive loss	(123.8)	(178.5)
Accumulated deficit	(2,084.9)	(964.2)
Total stockholders’ (deficit) equity	(256.0)	733.6
Total liabilities and stockholders' (deficit) equity	$ 4,113.6	$ 4,798.1

CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares	Jan. 31, 2018	Jan. 31, 2017
Statement of Financial Position [Abstract]
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (in shares)	2,000,000.0	2,000,000.0
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	750,000,000	750,000,000.0
Common stock, shares outstanding (in shares)	218,300,000	220,300,000

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Operating Activities
Net loss	$ (566.9)	$ (582.1)	$ (330.5)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation, amortization, and accretion	108.4	139.2	145.8
Stock-based compensation expense	261.4	221.8	197.2
Deferred income taxes	(39.1)	(38.8)	235.9
Restructuring charges and other facility exit costs, net	94.1	80.5	0.0
Other operating activities	7.3	(7.7)	(25.0)
Changes in operating assets and liabilities, net of business combinations:
Accounts receivable	13.3	201.5	(195.5)
Prepaid expenses and other current assets	(9.9)	(13.5)	(2.8)
Accounts payable and accrued liabilities	(13.9)	2.7	24.9
Deferred revenue	168.3	267.0	360.5
Accrued income taxes	(22.1)	(100.9)	3.5
Net cash provided by operating activities	0.9	169.7	414.0
Investing Activities
Purchases of marketable securities	(514.0)	(1,867.9)	(2,250.1)
Sales of marketable securities	489.0	1,257.7	329.4
Maturities of marketable securities	594.3	1,057.2	1,376.6
Acquisitions, net of cash acquired	0.0	(85.2)	(148.5)
Capital expenditures	(50.7)	(76.0)	(72.4)
Other investing activities	(12.2)	(13.8)	(44.5)
Net cash provided by (used in) investing activities	506.4	272.0	(809.5)
Financing Activities
Proceeds from issuance of common stock	94.4	119.6	110.8
Taxes paid related to net share settlement of equity awards	(143.1)	(76.2)	(51.6)
Repurchase and retirement of common shares	(699.0)	(621.7)	(458.0)
Proceeds from debt, net of discount	496.9	0.0	748.3
Repayments of debt	(400.0)	0.0	0.0
Other financing activities	(5.8)	0.0	(6.3)
Net cash (used in) provided by financing activities	(656.6)	(578.3)	343.2
Effect of exchange rate changes on cash and cash equivalents	14.2	(3.3)	(5.3)
Net decrease in cash and cash equivalents	(135.1)	(139.9)	(57.6)
Cash and cash equivalents at beginning of fiscal year	1,213.1	1,353.0	1,410.6
Cash and cash equivalents at end of fiscal year	1,078.0	1,213.1	1,353.0
Supplemental cash flow information:
Cash paid during the year for interest	54.6	47.6	34.7
Net cash paid during the year for income taxes	$ 84.5	$ 77.7	$ 59.1

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY - USD ($) shares in Millions, $ in Millions	Total	Common stock and additional paid-in capital	Accumulated other comprehensive loss	Retained earnings (Accumulated deficit)
Balance (in shares) at Jan. 31, 2015		227.0
Beginning Balance at Jan. 31, 2015	$ 2,219.2	$ 1,773.1	$ (53.3)	$ 499.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common shares issued under stock plans (in shares)		5.9
Common shares issued under stock plans	59.2	$ 59.2
Stock-based compensation expense	197.2	197.2
Tax benefits from employee stock plans	0.3	$ 0.3
Net loss	(330.5)			(330.5)
Other comprehensive income (loss)	(67.8)		(67.8)
Repurchase and retirement of common shares (in shares)		(8.5)
Repurchase and retirement of common shares	(458.0)	$ (208.3)		(249.7)
Balance (in shares) at Jan. 31, 2016		224.4
Ending Balance at Jan. 31, 2016	1,619.6	$ 1,821.5	(121.1)	(80.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common shares issued under stock plans (in shares)		5.6
Common shares issued under stock plans	43.4	$ 43.4
Stock-based compensation expense	221.8	$ 221.8
Net loss	(582.1)			(582.1)
Other comprehensive income (loss)	(57.4)		(57.4)
Repurchase and retirement of common shares (in shares)		(9.7)
Repurchase and retirement of common shares	(631.6)	$ (217.3)		(414.3)
Cumulative effect of accounting changes	$ 119.9	$ 6.9		113.0
Balance (in shares) at Jan. 31, 2017	220.3	220.3
Ending Balance at Jan. 31, 2017	$ 733.6	$ 1,876.3	(178.5)	(964.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common shares issued under stock plans (in shares)		4.9
Common shares issued under stock plans	(48.7)	$ (48.7)
Stock-based compensation expense	261.4	$ 261.4
Net loss	(566.9)			(566.9)
Other comprehensive income (loss)	54.7		54.7
Repurchase and retirement of common shares (in shares)		(6.9)
Repurchase and retirement of common shares	$ (690.1)	$ (136.3)		(553.8)
Balance (in shares) at Jan. 31, 2018	218.3	218.3
Ending Balance at Jan. 31, 2018	$ (256.0)	$ 1,952.7	$ (123.8)	$ (2,084.9)

Business and Summary of Significant Accounting Policies

12 Months Ended

Jan. 31, 2018

Accounting Policies [Abstract]

Business and Summary Of Significant Accounting Policies

Business and Summary of Significant Accounting PoliciesBusiness

Autodesk, Inc. (“Autodesk” or the “Company”) is a world leading design software and services company, offering customers productive business solutions through powerful technology products and services. The Company serves customers in the architecture, engineering, and construction; manufacturing; and digital media, consumer, and entertainment industries. The Company’s sophisticated software products, offered through a hybrid of desktop and cloud functionality, enable its customers to experience their ideas before they are real by allowing them to imagine, design, and create their ideas and to visualize, simulate, and analyze real-world performance early in the design process by creating digital prototypes. These capabilities allow Autodesk’s customers to foster innovation, optimize and improve their designs, help save time and money, improve quality, and collaborate with others. Autodesk software products are sold globally, both directly to customers and through a network of resellers and distributors.

Principles of Consolidation

The accompanying consolidated financial statements include the accounts of Autodesk and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated.

Change in Presentation

During the first quarter of fiscal 2018, the Company changed its historical presentation of its revenue and cost of revenue categories. Previously, the Company presented revenue and cost of revenue on two lines: subscription, and license and other. Included within subscription was maintenance revenue for all of the Company's software products and revenue for the Company's cloud service offerings. License and other revenue included product license revenue, standalone consulting services, and other immaterial items. Also, included within license and other revenue was an allocation of the estimated value of the software license from the Company's term-based product subscriptions and enterprise offerings, which contain a software license, maintenance and cloud services. For these arrangements, as there is no vendor-specific-objective evidence ("VSOE") for the related maintenance, the arrangement consideration was allocated between the license and maintenance deliverables based on best estimated selling prices in our consolidated statements of operations. The Company performed the allocation because it provided a meaningful presentation to investors based on the Company's then current product mix.

As part of the Company's technological and business model transition, the Company discontinued the sale of most of its perpetual licenses, transitioning away from selling a mix of perpetual licenses and term-based product subscriptions to a single subscription model involving a combined hybrid offering of desktop software and cloud functionality, which provides a device-independent, collaborative design workflow for designers and their stakeholders. Fiscal 2018 marks the first full year in the Company's history that it sold substantially all term-based product subscriptions. To better reflect this shift in its business, the Company adopted a revised presentation in the first quarter of fiscal 2018, including the separation of subscription revenue and maintenance revenue on distinct line items on the Company's consolidated statement of operations.

Subscription revenue now consists of our term-based product subscriptions, cloud service offerings, and flexible enterprise business arrangements. Note that with the change in presentation of revenue in the Company’s consolidated statement of operations in fiscal 2018, term-based product subscriptions and flexible enterprise business arrangements are classified and presented in a single line item.

Maintenance revenue is presented as a separate line item in the new presentation and consists of revenue from the Company's existing maintenance plan agreements and related renewals.

License and other revenue will continue to be presented as a separate line item and include any residual perpetual licenses sold, standalone consulting services, and other immaterial items.

In connection with these revisions, the Company also revised its cost of revenue classification to present cost of subscription and maintenance revenue and amortization of developed technology separately. Cost of license and other revenue will continue to be presented as a separate line item. This change in presentation does not affect the Company's total net revenues, total cost of net revenues or overall gross margin. The following table shows reclassified amounts to conform to the periods' presentation:



	Fiscal Year Ended January 31, 2017							Fiscal Year Ended January 31, 2016
	Previously Reported		Change in Presentation Reclassification			Current Presentation		Previously Reported		Change in Presentation Reclassification			Current Presentation
Net revenue:
Maintenance (1)	N/A		$	1,103.1		$	1,103.1	N/A		$	1,152.5		$	1,152.5
Subscription	$	1,290.0	(846.9		)	443.1		$	1,277.2	(1,049.1		)	228.1
License and other	741.0		(256.2		)	484.8		1,226.9		(103.4		)	1,123.5
Total	$	2,031.0	$	—		$	2,031.0	$	2,504.1	$	—		$	2,504.1

Cost of revenue:
Maintenance and subscription (2)	$	151.3	$	40.4		$	191.7	$	156.1	$	6.2		$	162.3
License and other	190.6		(80.4		)	110.2		214.6		(55.2		)	159.4
Amortization of developed technology (1)	N/A		40.0			40.0		N/A		49.0			49.0
Total	$	341.9	$	—		$	341.9	$	370.7	$	—		$	370.7

_______________

(1) These lines were not previously reported in the Consolidated Statement of Operations.

(2) Previously, titled "Subscription."

Use of Estimates

The preparation of financial statements in conformity with U.S. generally accepted accounting principles ("GAAP") requires management to make estimates and assumptions that affect the amounts reported in Autodesk’s consolidated financial statements and notes thereto. These estimates are based on information available as of the date of the consolidated financial statements. On a regular basis, management evaluates these estimates and assumptions. Actual results may differ materially from these estimates.

Examples of significant estimates and assumptions made by management involve the determination of the fair value of acquired assets and liabilities, goodwill, financial instruments including strategic investments, long-lived assets and other intangible assets, the realizability of deferred tax assets, and the fair value of stock awards. The Company also makes assumptions, judgments, and estimates in determining the accruals for uncertain tax positions, provisional estimates associated with the December 22, 2017 enactment of the U.S. Tax Cuts and Jobs Act ("Tax Act"), variable compensation, partner incentive programs, product returns reserves, allowances for doubtful accounts, asset retirement obligations, and legal contingencies.Foreign Currency Translation and Transactions

The assets and liabilities of Autodesk’s foreign subsidiaries are translated from their respective functional currencies into U.S. dollars at the rates in effect at the balance sheet date, and revenue and expense amounts are translated at exchange rates that approximate those rates in effect during the period in which the underlying transactions occur. Foreign currency translation adjustments are recorded as other comprehensive (loss) income.

Gains and losses realized from foreign currency transactions, those transactions denominated in currencies other than the foreign subsidiary’s functional currency, are included in interest and other income, net. Monetary assets and liabilities are remeasured using foreign currency exchange rates at the end of the period, and non-monetary assets are remeasured based on historical exchange rates.

Derivative Financial Instruments

Autodesk accounts for its derivative instruments as either assets or liabilities on the balance sheet and carries them at fair value. Gains and losses resulting from changes in fair value are accounted for depending on the use of the derivative and whether it is designated and qualifies for hedge accounting. Derivatives that do not qualify for hedge accounting are adjusted to fair value through earnings. See Note 2, "Financial Instruments" for information regarding Autodesk's hedging activities.

Cash and Cash Equivalents

Autodesk considers all highly liquid investments with insignificant interest rate risk and remaining maturities of three months or less at the date of purchase to be cash equivalents. Cash equivalents are recorded at cost, which approximates fair value.

Marketable Securities and Privately Held Company Investments

Marketable securities are stated at fair value. Marketable securities maturing within one year that are not restricted are classified as current assets. Substantially all marketable debt and equity investments held by Autodesk are classified as current based on the nature of the investments and their availability for use in current operations.

Autodesk determines the appropriate classification of its marketable securities at the time of purchase and re-evaluates such classification as of each balance sheet date. Autodesk carries all “available-for-sale securities” at fair value, with unrealized gains and losses, net of tax, reported in stockholders’ equity (deficit) until disposition or maturity. Autodesk carries all “trading securities” at fair value, with unrealized gains and losses, recorded in “Interest and other income, net” in the Company’s Consolidated Statements of Operations. The cost of securities sold is based on the specific-identification method.

Autodesk regularly invests in non-marketable debt and equity securities of privately held companies. The carrying values of such investments are included in other long-term assets. For the majority of our privately held company investments, we use the cost method of accounting.

All of Autodesk’s marketable securities and privately held company investments are subject to a periodic impairment review. The Company recognizes an impairment charge when a decline in the fair value of its investments below the cost basis is judged to be other-than-temporary. Autodesk considers various factors in determining whether to recognize an impairment charge, including the length of time and extent to which the fair value has been less than Autodesk’s cost basis, the financial condition and near-term prospects of the investee, and Autodesk’s intent and ability to hold the investment for a period of time sufficient to allow for any anticipated recovery in the market value. For additional information, see “Concentration of Credit Risk” within this Note 1 and Note 2, “Financial Instruments.”Accounts Receivable, Net

Accounts receivable, net, consisted of the following as of January 31:



	2018			2017
Trade accounts receivable	$	469.2		$	477.5
Less: Allowance for doubtful accounts	(2.3		)	(1.5		)
Product returns reserve	(0.2		)	(0.2		)
Partner programs and other obligations	(28.5		)	(23.5		)
Accounts receivable, net	$	438.2		$	452.3

Allowances for uncollectible trade receivables are based upon historical loss patterns, the number of days that billings are past due, and an evaluation of the potential risk of loss associated with problem accounts.

As part of the indirect channel model, Autodesk has a partner incentive program that uses quarterly attainment of monetary rewards to motivate distributors and resellers to achieve mutually agreed upon business goals in a specified time period. A portion of these incentives reduce license and other revenue in the current period. The remainder, which relates to incentives on our Subscription Program, is recorded as a reduction to deferred revenue in the period the subscription transaction is billed and subsequently recognized as a reduction to subscription revenue over the contract period. These incentive balance

s do not require significant assumptions or judgments. Depending on how the payments are made, the reserves associated with the partner incentive program are treated on the balance sheet as either contra account receivable or accounts payable.Concentration of Credit Risk

Autodesk places its cash, cash equivalents, and marketable securities in highly liquid instruments with, and in the custody of, multiple diversified financial institutions globally with high credit ratings and limits the amounts invested with any one institution, type of security, and issuer.

Autodesk’s primary commercial banking relationship is with Citigroup Inc. and its global affiliates. Citibank, N.A., an affiliate of Citigroup, is one of the lead lenders and an agent in the syndicate of Autodesk’s $400.0 million line of credit facility. It is Autodesk’s policy to limit the amounts invested with any one institution by type of security and issuer.

The bank counterparties to the derivative contracts potentially expose Autodesk to credit-related losses in the event of their nonperformance. However, to mitigate that risk, Autodesk only contracts with counterparties who meet the Company's minimum requirements under its counterparty risk assessment process. Autodesk monitors counterparty risk on at least a quarterly basis and will adjust its exposure to various counterparties as necessary. Autodesk generally enters into master netting arrangements, which reduce credit risk by permitting net settlement of transactions with the same counterparty. However, Autodesk does not have any master netting arrangements in place with collateral features.

Autodesk’s accounts receivable are derived from sales to a large number of resellers, distributors, and direct customers in the Americas; EMEA; and APAC geographies. Autodesk performs ongoing evaluations of these partners' financial condition and limits the amount of credit extended when deemed necessary, but generally does not require collateral from such parties. Total sales to the Company's largest distributor Tech Data Corporation, and its global affiliates (“Tech Data”), accounted for 31%, 30%, and 25% of Autodesk's net revenue for fiscal years ended January 31, 2018, 2017, and 2016, respectively. The majority of the net revenue from sales to Tech Data is for sales made outside of the United States. In addition, Tech Data accounted for 31% and 20% of trade accounts receivable as of January 31, 2018, and 2017, respectively.Computer Equipment, Software, Furniture, and Leasehold Improvements, Net

Computer equipment, software, and furniture are depreciated using the straight-line method over the estimated useful lives of the assets, which range from three to five years. Leasehold improvements are amortized on a straight-line basis over the shorter of their estimated useful lives or the lease term. Depreciation expense was $67.6 million in fiscal 2018, $73.1 million in fiscal 2017, and $60.6 million in fiscal 2016.

Computer equipment, software, furniture, leasehold improvements and the related accumulated depreciation at January 31 were as follows:



	2018			2017
Computer hardware, at cost	$	217.1		$	206.1
Computer software, at cost	72.6			73.5
Leasehold improvements, land and buildings, at cost	228.9			206.3
Furniture and equipment, at cost	63.4			58.2
Computer software, hardware, leasehold improvements, furniture, and equipment, at cost	582.0			544.1
Less: Accumulated depreciation	(437.0		)	(385.5		)
Computer software, hardware, leasehold improvements, furniture, and equipment, net	$	145.0		$	158.6

Costs incurred for computer software developed or obtained for internal use are capitalized for application development activities, if material, and immediately expensed for preliminary project activities and post-implementation activities. These capitalized costs are amortized over the software’s expected useful life, which is generally three years.

Software Development Costs

Software development costs incurred prior to the establishment of technological feasibility are included in research and development expenses. Autodesk defines establishment of technological feasibility as the completion of a working model. Software development costs incurred subsequent to the establishment of technological feasibility through the period of general market availability of the products are capitalized and generally amortized over a three-year period, if material. Autodesk had no material capitalized software development costs at January 31, 2018, and January 31, 2017.Other Intangible Assets, Net

Other intangible assets include developed technologies, customer relationships, trade names, patents, user lists and the related accumulated amortization. These assets are shown as “Developed technologies, net” and as part of “Other assets” in the Consolidated Balance Sheet. The majority of Autodesk’s other intangible assets are amortized to expense over the estimated economic life of the product, which ranges from two to ten years. Amortization expense for developed technologies, customer relationships, trade names, patents, and user lists was $36.6 million in fiscal 2018, $72.2 million in fiscal 2017 and $82.6 million in fiscal 2016.

Other intangible assets and related accumulated amortization at January 31 were as follows:



	2018			2017
Developed technologies, at cost	$	578.5		$	583.6
Customer relationships, trade names, patents, and user lists, at cost (1)	372.5			375.9
Other intangible assets, at cost (2)	951.0			959.5
Less: Accumulated amortization	(895.8		)	(862.0		)
Other intangible assets, net	$	55.2		$	97.5

_______________


(1)	Included in “Other assets” in the accompanying Consolidated Balance Sheets.


(2)	Includes the effects of foreign currency translation.

The weighted average amortization period for developed technologies, customer relationships, trade names, patents, and user lists during fiscal 2018 was 4.9 years. Excluding in-process research and development, expected future amortization expense for developed technologies, customer relationships, trade names, patents, and user lists for each of the fiscal years ended thereafter is as follows:



	Fiscal Year ended January 31,
2019	$	28.0
2020	16.1
2021	7.7
2022	3.4
Thereafter	—
Total	$	55.2

Goodwill

Goodwill consists of the excess of the consideration transferred over the fair value of net assets acquired in business combinations. Autodesk tests goodwill for impairment annually in its fourth fiscal quarter or more often if circumstances indicate a potential impairment may exist, or if events have affected the composition of reporting units.

When goodwill is assessed for impairment, Autodesk has the option to perform an assessment of qualitative factors of impairment (“optional assessment”) prior to necessitating a quantitative impairment test. Should the optional assessment be used for any given fiscal year, qualitative factors to consider include cost factors; financial performance; legal, regulatory, contractual, political, business, or other factors; entity specific factors; industry and market considerations, macroeconomic conditions, and other relevant events and factors affecting the reporting unit. If, after assessing the totality of events or

circumstances, it is more likely than not that the fair value of the reporting unit is greater than its carrying value, then performing the quantitative impairment test is unnecessary.

The quantitative impairment test is necessary when either Autodesk does not use the optional assessment or, as a result of the optional assessment, it is not more likely than not that the fair value of the reporting unit is greater than its carrying value.

As described in the "Accounting Standards Adopted" section of Note 1, Autodesk early adopted ASU 2017-04, which simplifies the subsequent measurement of goodwill to eliminate Step 2 from the goodwill impairment test, removing the need to determine the implied fair value of goodwill and comparing it to the carrying amount of that goodwill to measure the impairment loss, if any. In situations in which an entity's reporting unit is publicly traded, the fair value of the Company may be approximated by its market capitalization, in performing the quantitative impairment test.

Goodwill impairment exists when the estimated fair value of goodwill is less than its carrying value. If impairment exists, the carrying value of the goodwill is reduced to fair value through an impairment charge recorded in the Company's statements of operations. The process of evaluating the potential impairment of goodwill is subjective and requires significant judgment at many points during the analysis. The value of Autodesk’s goodwill could also be impacted by future adverse changes such as: (i) declines in Autodesk’s actual financial results, (ii) a sustained decline in Autodesk’s market capitalization, (iii) a significant slowdown in the worldwide economy or the industries Autodesk serves, or (iv) changes in Autodesk’s business strategy.

For the annual impairment test, Autodesk's market capitalization was substantially in excess of the carrying value of the Company as of January 31, 2018. Accordingly, Autodesk has determined there was no goodwill impairment during the year ended January 31, 2018. In addition, Autodesk did not recognize any goodwill impairment losses in fiscal 2017 or 2016.

The following table summarizes the changes in the carrying amount of goodwill during the fiscal years ended January 31, 2018 and 2017:



	January 31, 2018			January 31, 2017
Goodwill, beginning of the year	$	1,710.3		$	1,684.2
Less: accumulated impairment losses, beginning of the year	(149.2		)	(149.2		)
Additions arising from acquisitions during the year	—			62.8
Effect of foreign currency translation, measurement period adjustments, and other (1)	59.1			(36.7		)
Goodwill, end of the year	$	1,620.2		$	1,561.1

_______________


(1)	Purchase accounting adjustments reflect revisions made to the Company’s preliminary purchase price allocations during fiscal 2018 and 2017.

Impairment of Long-Lived Assets

At least annually or more frequently as circumstances dictate, Autodesk reviews its long-lived assets for impairment whenever impairment indicators exist. Autodesk continually monitors events and changes in circumstances that could indicate the carrying amounts of its long-lived assets may not be recoverable. When such events or changes in circumstances occur, Autodesk assesses recoverability of these assets. Recoverability is measured by comparison of the carrying amounts of the assets to the future undiscounted cash flow the assets are expected to generate. If the long-lived assets are considered to be impaired, the impairment to be recognized is equal to the amount by which the carrying value of the assets exceeds its fair market value. Autodesk did not recognize any material impairments of long-lived assets during the fiscal years ended January 31, 2018, 2017, and 2016, respectively.

In addition to the recoverability assessments, Autodesk routinely reviews the remaining estimated useful lives of its long-lived assets. Any reduction in the useful life assumption will result in increased depreciation and amortization expense in the quarter when such determinations are made, as well as in subsequent quarters.Deferred Tax Assets

Deferred tax assets arise primarily from tax credits, net operating losses, and timing differences for reserves, accrued liabilities, stock options, deferred revenue, purchased technologies, and capitalized intangibles, partially offset by U.S. deferred tax liabilities on acquired intangibles, and valuation allowances against U.S. and foreign deferred tax assets. Autodesk performed a quarterly assessment of the recoverability of these net deferred tax assets and believe it will generate sufficient

future taxable income in appropriate tax jurisdictions to realize the net deferred tax assets. They are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to reverse. Valuation allowances are established when necessary to reduce gross deferred tax assets to the amount that is "more likely than not" to be realized.Revenue Recognition

Autodesk recognizes revenue when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, the price is fixed or determinable, and collection is probable.

For multiple element arrangements containing only software and software-related elements, Autodesk allocates the sales price among each of the deliverables using the residual method, under which a portion of the total arrangement consideration is allocated to undelivered elements based on their vendor-specific objective evidence (“VSOE”) of fair value and the remainder or residual of the total consideration is recognized as revenue for the delivered elements. VSOE is the price charged when an element is sold separately or a price set by management with the relevant authority. If Autodesk does not have VSOE of an undelivered element, revenue recognition is deferred on the entire sales arrangement until all elements for which Autodesk does not have VSOE are delivered. If Autodesk does not have VSOE for undelivered product subscriptions, maintenance or services, the total consideration for the arrangement is recognized ratably over the longest contractual service period in the arrangement.

For multiple element arrangements involving non-software elements, including cloud subscription services, our revenue recognition policy is based upon the accounting guidance contained in ASC 605, Revenue Recognition. For these arrangements, Autodesk first allocates the total arrangement consideration based on the relative selling prices of the software group of elements as a whole and to the non-software elements. Autodesk then further allocates consideration within the software group to the respective elements within that group using the residual method as described above. Autodesk exercises judgment and uses estimates in connection with the determination of the amount of revenue to be recognized in each accounting period.

Autodesk allocates the total arrangement consideration among the various elements based on a selling price hierarchy. The selling price for a deliverable is based on its VSOE if available, third-party evidence ("TPE") if VSOE is not available, or the best estimated selling price ("BESP") if neither VSOE nor TPE is available. BESP represents the price at which Autodesk would transact for the deliverable if it were sold regularly on a standalone basis. To establish BESP for those elements for which neither VSOE nor TPE are available, Autodesk performs a quantitative analysis of pricing data points for historical standalone transactions involving such elements for a twelve-month period. As part of this analysis, Autodesk monitors and evaluates the BESP against actual pricing to ensure that it continues to represent a reasonable estimate of the standalone selling price, considering several other external and internal factors including, but not limited to, pricing and discounting practices, contractually stated prices, the geographies in which Autodesk offers products and services, and the type of customer (i.e. distributor, value-added reseller, and direct end user, among others). Autodesk analyzes BESP at least annually or on a more frequent basis if a significant change in our business necessitates a more timely analysis, or if significant selling price variances are experienced.

In situations when Autodesk has multiple contracts with a single counterparty, Autodesk uses the guidance in ASC 985-605 to evaluate both the form and the substance of the arrangements to determine if they should be combined and accounted for as one arrangement or as separate arrangements.

Autodesk’s assessment of the likelihood of collection is also a critical factor in determining the timing of revenue recognition. If Autodesk does not believe that collection is probable, the revenue will be deferred until payment is received.

Autodesk's maintenance revenue consists of renewal fees for existing maintenance plan agreements that were initially purchased with a perpetual software license. Under the maintenance plan, customers are eligible to receive unspecified upgrades, when and if available, and technical support. Autodesk recognizes maintenance revenue ratably over the term of the maintenance agreement, which is generally between one and three years.

Autodesk's subscription revenue consists of term-based product subscriptions, cloud service offerings, and flexible enterprise business arrangements. With Autodesk's subscription plan, customers can use Autodesk software anytime, anywhere, and get access to the latest updates to previous versions. Revenue from these arrangements is recognized ratably over the contract term. Revenue for Autodesk's cloud service offerings is recognized ratably over the contract term, commencing with the date Autodesk's service is made available to customers and when all other revenue recognition criteria have been satisfied.

License and other revenue consists of two components: license revenue and other revenue. License revenue includes software license revenue from the sale of perpetual licenses. Other revenue includes revenue such as standalone consulting and training, and is recognized over time as the services are performed.

Taxes Collected from Customers

Autodesk nets taxes collected from customers against those remitted to government authorities in the consolidated financial statements. Accordingly, taxes collected from customers are not reported as revenue.

Shipping and Handling Costs

Shipping and handling costs are included in cost of revenue for all periods presented.Stock-based Compensation Expense

The following table summarizes stock-based compensation expense for fiscal 2018, 2017, and 2016, respectively, as follows:



	Fiscal Year Ended January 31,
	2018			2017			2016
Cost of maintenance and subscription revenue	$	11.9		$	8.6		$	5.8
Cost of license and other revenue	4.0			5.5			6.0
Marketing and sales	107.3			94.1			85.2
Research and development	82.9			81.3			70.4
General and administrative	55.3			32.3			29.8
Stock-based compensation expense related to stock awards and Employee Qualified Stock Purchase Plan ("ESPP") purchases	261.4			221.8			197.2
Tax benefit	(2.6		)	(2.6		)	(1.6		)
Stock-based compensation expense related to stock awards and ESPP purchases, net	$	258.8		$	219.2		$	195.6

Autodesk determines the grant date fair value of its share-based payment awards using a Black-Scholes Merton ("BSM") option pricing model or the quoted stock price on the date of grant, unless the awards are subject to market conditions, in which case Autodesk uses a binomial-lattice model (e.g., Monte Carlo simulation model). The Monte Carlo simulation model utilizes multiple input variables to estimate the probability that market conditions will be achieved. Autodesk uses the following assumptions to estimate the fair value of stock-based awards:



	Fiscal Year Ended		Fiscal Year Ended		Fiscal Year Ended
	January 31, 2018		January 31, 2017		January 31, 2016
	Performance Stock Unit	ESPP	Performance Stock Unit	ESPP	Performance Stock Unit	ESPP
Range of expected volatilities	32%	31% - 34%	38 - 39%	30 - 40%	27%	28 -29%
Range of expected lives (in years)	N/A	0.5 - 2.0	N/A	0.5 - 2.0	N/A	0.5 - 2.0
Expected dividends	—%	—%	—%	—%	—%	—%
Range of risk-free interest rates	1.0% - 1.2%	0.9% - 1.4%	0.6 - 0.7%	0.5 - 0.9%	0.2%	0.1 - 0.7%

Autodesk estimates expected volatility for stock-based awards based on the average of the following two measures: (1) a measure of historical volatility in the trading market for the Company’s common stock, and (2) the implied volatility of traded forward call options to purchase shares of the Company’s common stock. The expected volatility for performance stock units subject to market conditions includes the expected volatility of Autodesk's peer companies within the S&P Computer Software Select Index or S&P North American Technology Software Index with a market capitalization over $2.00 billion, depending on the award type.

Autodesk estimates the expected life of stock-based awards using both exercise behavior and post-vesting termination behavior as well as consideration of outstanding options. The range of expected lives of ESPP awards are based upon the four, six-month exercise periods within a 24-month offering period.

Autodesk did not pay cash dividends in fiscal 2018, 2017, or 2016 and does not anticipate paying any cash dividends in the foreseeable future. Consequently, an expected dividend yield of zero is used in the BSM option pricing model and the Monte Carlo simulation model.

The risk-free interest rate used in the BSM option pricing model and the Monte Carlo simulation model for stock-based awards is the historical yield on U.S. Treasury securities with equivalent remaining lives.

Autodesk recognizes expense only for the stock-based awards that ultimately vest. Autodesk accounts for forfeitures of stock-based awards as those forfeitures occur.Advertising Expenses

Advertising costs are expensed as incurred. Total advertising expenses incurred were $31.1 million in fiscal 2018, $33.6 million in fiscal 2017, and $29.8 million in fiscal 2016.Net (Loss) Income Per Share

Basic net (loss) income per share is computed based on the weighted average number of shares of common stock outstanding for the period, excluding stock options and restricted stock. Diluted net (loss) income per share is computed based upon the weighted average shares of common shares outstanding for the period and potentially dilutive common shares, including the effect of stock options and restricted stock units under the treasury stock method.Defined Benefit Pension Plans

The funded status of Autodesk's defined benefit pension plans is recognized in the Consolidated Balance Sheets. The funded status is measured as the difference between the fair value of plan assets and the projected benefit obligation for the fiscal years presented. The projected benefit obligation represents the actuarial present value of benefits expected to be paid upon retirement based on employee services already rendered and estimated future compensation levels. The fair value of plan assets represents the current market value of Autodesk's cumulative company and participant contributions made to the various plans in effect.

Net periodic benefit cost is recorded in the Consolidated Statements of Operations and includes service cost, interest cost, expected return on plan assets, amortization of prior service costs, and gains or losses previously recognized as a component of other comprehensive loss. Certain events, such as changes in the employee base, plan amendments, and changes in actuarial assumptions may result in a change in the defined benefit obligation and the corresponding change to other comprehensive income.

Gains and losses and prior service costs not recognized as a component of net periodic benefit cost in the Consolidated Statements of Operations as they arise are recognized as a component of other comprehensive (loss) income in the Consolidated Statements of Comprehensive (Loss) Income. Those gains and losses and prior service costs are subsequently amortized as a component of net periodic benefit cost over the average remaining service lives of the plan participants using a corridor approach to determine the portion of gain or loss subject to amortization.

The measurement of projected benefit obligations and net periodic benefit cost is based on estimates and assumptions that reflect the terms of the plans and use participant-specific information such as compensation, age and years of services, as well as certain assumptions, including estimates of discount rates, expected return of plan assets, rate of compensation increases, interest rates, and mortality rates.Accounting Standards in Fiscal 2018

With the exception of those discussed below, there have been no recent changes in accounting pronouncements issued by FASB or adopted by the Company during the fiscal year ended January 31, 2018, that are of significance, or potential significance, to the Company.

Accounting Standards Adopted

Autodesk adopted FASB's Accounting Standards Update No. 2017-04 ("ASU 2017-04"), "Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment" during the three months ended April 30, 2017. The ASU simplifies the accounting for goodwill impairment by removing Step 2 of the goodwill impairment test. Under current guidance, Step 2 of the goodwill impairment test requires entities to calculate the implied fair value of goodwill in the same manner as the amount of goodwill recognized in a business combination by assigning the fair value of a reporting unit to all of the assets and liabilities of the reporting unit. The carrying value in excess of the implied fair value is recognized as goodwill impairment. Under the new standard, goodwill impairment is recognized based on Step 1 of the current guidance, which calculates the carrying value in excess of the reporting unit’s fair value. The new guidance is required to be applied on a prospective basis and as such, Autodesk used the simplified test in its annual fourth fiscal quarter testing. ASU 2017-04 did not have a material impact on Autodesk's consolidated financial statements.

Recently Issued Accounting Standards But Not Yet Adopted

In February 2018, the FASB issued Accounting Standards Update No. 2018-02 (“ASU 2018-02”), “Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.” The amendment allows entities to reclassify stranded tax effects resulting from the Tax Cuts and Jobs Act from accumulated other comprehensive income to retained earnings. The amendment only impacts the income tax effect of the passage of the Tax Cuts and Jobs Act but does not affect the underlying guidance that requires that the effect of a change in tax laws or rates be included in income from continuing operations. The amendment is effective for Autodesk fiscal year beginning February 1, 2019, with early adoption permitted. Autodesk is currently evaluating the accounting, transition, and disclosure requirements of the standard and cannot currently estimate the financial statement impact of adoption.

In August 2017, FASB issued Accounting Standards Update No. 2017-12 ("ASU 2017-12"), "Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities." The targeted amendments help simplify certain aspects of hedge accounting and result in a more accurate portrayal of the economics of an entity’s risk management activities in its financial statements. For cash flow and net investment hedges as of the adoption date, the guidance requires a modified retrospective approach. The amended presentation and disclosure guidance is required only prospectively. The amendments are effective for Autodesk's fiscal year beginning February 1, 2019, with early adoption permitted. Autodesk is currently evaluating the accounting, transition, and disclosure requirements of the standard and cannot currently estimate the financial statement impact of adoption.

In February 2017, FASB issued Accounting Standards Update No. 2017-05 ("ASU 2017-05"), "Other Income– Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets." The ASU, among other things, clarifies the scope of the derecognition of nonfinancial assets, the definition of in substance financial assets, and impacts the accounting for partial sales of nonfinancial assets by requiring full gain recognition upon the sale. The amendments are effective for Autodesk's fiscal year beginning February 1, 2018. The guidance may be applied retrospectively for all periods presented or retrospectively with a cumulative-effect adjustment at the date of adoption. The effect of the implementation will depend upon the nature of the Company's future acquisitions or dispositions, if any. The adoption of the guidance would not have had a material impact on acquisitions prior to the current period and on the Company's consolidated statements of financial condition and results of operations.

In January 2017, FASB issued Accounting Standards Update No. 2017-01 ("ASU 2017-01"), "Business Combinations: Clarifying the Definition of a Business" which provides a more robust framework to use in determining when a set of assets and activities is considered a business. The amendments will be effective for Autodesk's fiscal year beginning February 1, 2018. The new guidance is required to be applied on a prospective basis. The effect of the implementation will depend upon the nature of the Company's future acquisitions, if any.

In October 2016, FASB issued Accounting Standards Update No. 2016-16 ("ASU 2016-16"), “Income Taxes: Intra-Entity Transfers of Assets Other than Inventory” which requires that entities recognize the income tax consequences of an intra-entity transfer of an asset, other than inventory, when the transfer occurs. The amendments will be effective for Autodesk's fiscal year beginning February 1, 2018. The new guidance is required to be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. Autodesk does not believe the ASU will have a material impact on its consolidated financial statements.

In June 2016, FASB issued Accounting Standards Update No. 2016-13 ("ASU 2016-13") regarding ASC Topic 326, "Financial Instruments - Credit Losses," which modifies the measurement of expected credit losses of certain financial instruments. Autodesk plans to adopt ASU 2016-13 as of the effective date which represents Autodesk’s fiscal year beginning February 1, 2020. Autodesk does not believe the ASU will have a material impact on its consolidated financial statements.

In February 2016, FASB issued Accounting Standards Update No. 2016-02 ("ASU 2016-02") regarding ASC Topic 842, "Leases." The amendments in this ASU require balance sheet recognition of lease assets and lease liabilities by lessees for leases classified as operating leases, with an optional policy election to not recognize lease assets and lease liabilities for leases with a term of 12 months or less. The amendments also require new disclosures, including qualitative and quantitative requirements, providing additional information about the amounts recorded in the financial statements. Autodesk plans to adopt ASU 2016-02 in Autodesk’s fiscal year beginning February 1, 2019. The amendments require a modified retrospective approach with optional practical expedients. Autodesk is currently evaluating the accounting, transition, and disclosure requirements of the standard and cannot currently estimate the financial statement impact of adoption.

In January 2016, FASB issued Accounting Standards Update No. 2016-01 ("ASU 2016-01") regarding ASC Topic 825-10, "Financial Instruments - Overall." The amendments address certain aspects of recognition, measurement, presentation, and disclosure of financial instruments, and require equity securities to be measured at fair value, unless the measurement alternative method has been elected, with changes in fair value recognized through net income. The amendments also simplify the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment for impairment quarterly at each reporting period. The amendments in ASU 2016-01 will be effective for Autodesk's fiscal year beginning February 1, 2018. An entity should apply the amendments by means of a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption, with prospective adoption of the amendments related to equity securities without readily determinable fair values existing as of the date of adoption. Autodesk does not believe ASU 2016-01 will have a material impact on its consolidated financial statements.

In May 2014, FASB issued Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers (ASC Topic 606),” which supersedes the revenue recognition requirements in "Revenue Recognition (ASC Topic 605)." ASU 2014-09 provides principles for recognizing revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In August 2015, FASB issued Accounting Standards Update No. 2015-14 to defer the effective date by one year with early adoption permitted as of the original effective date. In addition, FASB issued Accounting Standards Update No. 2016-08, Accounting Standards Update No. 2016-10, Accounting Standards Update No. 2016-12, and Accounting Standard Update No. 2016-20 in March 2016, April 2016, May 2016, and December 2016, respectively, to help provide interpretive clarifications on the new guidance in ASC Topic 606.

Autodesk will adopt ASU 2014-09 as of February 1, 2018, using the modified retrospective transition method. The Company's implementation efforts are substantially complete.

The Company has concluded that the desktop software and related cloud services that are included in the majority of its product subscription offerings and enterprise arrangements are not distinct in the context of the contract as they are considered highly interrelated and represent a single combined performance obligation that should be recognized over time. Therefore, the new standard will not result in a material change in the timing and amount of the recognition of revenue for the majority of the Company's product subscription offerings and enterprise arrangements.

One impact of the new standard relates to product subscriptions that do not incorporate substantial cloud services. A limited number of Autodesk's product subscriptions do not incorporate substantial cloud services, and under ASU 2014-09, will be recognized as distinct license and service performance obligations. Currently, under ASC Topic 605, licenses sold with undelivered elements without VSOE are recognized ratably over the term of the undelivered elements. Under ASC Topic 606, Autodesk is no longer required to establish VSOE to recognize software license revenue separately from the other elements and will recognize software licenses once the customer obtains control of the license, which is generally upon delivery of the license. Therefore, revenue allocated to the licenses in these offerings under Topic 606 will be recognized at a point in time instead of over the contract term. While the Company is still evaluating, Autodesk believes the impact of the change to the timing of revenue recognition is expected to have a balance sheet pre-tax impact at the date of adoption of approximately $80 - $100 million reduction to the deferred revenue balance.

Another significant provision under ASU 2014-09 includes the capitalization and amortization of costs associated with obtaining a contract, most significantly sales commissions. The amortization period for the Company's deferred costs will be

recognized over the estimated period of benefit. The Company expects there to be a balance sheet pre-tax impact at the date of adoption recognizing the deferred sales commission capitalization costs of approximately $102 - $112 million.

Financial Instruments

12 Months Ended

Jan. 31, 2018

Investments, All Other Investments [Abstract]

Financial Instruments

The following tables summarize the Company's financial instruments' amortized cost, gross unrealized gains, gross unrealized losses, and fair value by significant investment category as of January 31, 2018 and 2017.



			January 31, 2018
			Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value			Level 1		Level 2			Level 3
Cash equivalents (1):
	Agency bonds		$	5.0	$	—	$	—		$	5.0		$	5.0	$	—		$	—
	Certificates of deposit		17.4		—		—			17.4			17.4		—			—
	Commercial paper		324.2		—		—			324.2			—		324.2			—
	Corporate debt securities		5.0		—		—			5.0			5.0		—			—
	Custody cash deposit		5.2		—		—			5.2			5.2		—			—
	Money market funds		278.8		—		—			278.8			—		278.8			—
	Municipal bonds		5.0		—		—			5.0			5.0		—			—
	Sovereign debt		2.0		—		—			2.0			—		2.0			—
Marketable securities:
	Short-term available-for-sale
		Asset backed securities	13.1		—		—			13.1			—		13.1			—
		Commercial paper	27.5		—		—			27.5			—		27.5			—
		Corporate debt securities	99.4		—		(0.1		)	99.3			99.3		—			—
		Other (2)	9.2		—		—			9.2			7.7		1.5			—
		U.S. government securities	37.1		—		—			37.1			37.1		—			—
	Short-term trading securities
		Mutual funds	50.1		8.9		—			59.0			59.0		—			—
	Long-term available-for-sale
		Agency bonds	13.7		—		(0.1		)	13.6			13.6		—			—
		Asset backed securities	36.8		—		(0.2		)	36.6			—		36.6			—
		Corporate debt securities	100.2		0.1		(0.4		)	99.9			99.9		—			—
		Municipal bonds	12.7		—		(0.1		)	12.6			12.6		—			—
		Sovereign debt	2.8		—		—			2.8			—		2.8			—
		U.S. government securities	25.5		—		(0.2		)	25.3			25.3		—			—
Convertible debt securities (3)			7.5		0.5		(0.2		)	7.8			—		—			7.8
Derivative contract assets (4)			2.0		7.5		(1.3		)	8.2			—		7.2			1.0
Derivative contract liabilities (5)			—		—		(26.6		)	(26.6		)	—		(26.6		)	—
		Total	$	1,080.2	$	17.0	$	(29.2	)	$	1,068.0		$	392.1	$	667.1		$	8.8

____________________


(1)	Included in “Cash and cash equivalents” in the accompanying Consolidated Balance Sheets.


(2)	Consists of agency bonds, certificates of deposit, sovereign debt, and municipal bonds.


(3)	Considered “available for sale” and included in “Other assets” in the accompanying Consolidated Balance Sheets.


(4)	Included in “Prepaid expenses and other current assets,” “Other assets,” or “Other accrued liabilities” in the accompanying Consolidated Balance Sheets.


(5)	Included in “Other accrued liabilities” in the accompanying Consolidated Balance Sheets.



			January 31, 2017
			Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value			Level 1		Level 2			Level 3
Cash equivalents (1):
	Agency bonds		$	6.0	$	—	$	—		$	6.0		$	6.0	$	—		$	—
	Certificates of deposit		63.1		—		—			63.1			63.1		—			—
	Commercial paper		207.4		—		—			207.4			—		207.4			—
	Corporate debt securities		40.2		—		—			40.2			40.2		—			—
	Custody cash deposit		3.2		—		—			3.2			3.2		—			—
	Money market funds		256.5		—		—			256.5			—		256.5			—
	Municipal bonds		5.0		—		—			5.0			5.0		—			—
	Sovereign debt		15.0		—		—			15.0			—		15.0			—
	U.S. government securities		309.5		—		—			309.5			309.5		—			—
Marketable securities:
	Short-term available-for-sale
		Agency bonds	13.2		—					13.2			13.2		—			—
		Asset backed securities	19.6		—		—			19.6			—		19.6			—
		Certificates of deposit	157.3		—		—			157.3			157.3		—			—
		Commercial paper	109.2		—		—			109.2			—		109.2			—
		Corporate debt securities	234.7		—		(0.2		)	234.5			234.5		—			—
		Municipal bonds	43.4		—		—			43.4			43.4		—			—
		Sovereign debt	30.0		—		—			30.0			—		30.0			—
		U.S. government securities	32.3		—		—			32.3			32.3		—			—
	Short-term trading securities
		Mutual funds	44.8		2.5		—			47.3			47.3		—			—
	Long-term available-for-sale
		Agency bonds	7.1		—		—			7.1			7.1		—			—
		Asset backed securities	65.8		0.1		—			65.9			—		65.9			—
		Corporate debt securities	172.1		0.1		(0.1		)	172.1			172.1		—			—
		Municipal bonds	10.7		—		—			10.7			10.7		—			—
		Sovereign debt	1.5		—		—			1.5			—		1.5			—
		U.S. government securities	48.8		0.1		—			48.9			48.9		—			—
Convertible debt securities (2)			4.9		2.3		(1.6		)	5.6			—		—			5.6
Derivative contract assets (3)			2.2		12.3		(1.3		)	13.2			—		11.9			1.3
Derivative contract liabilities (4)			—		—		(10.4		)	(10.4		)	—		(10.4		)	—
		Total	$	1,903.5	$	17.4	$	(13.6	)	$	1,907.3		$	1,193.8	$	706.6		$	6.9

____________________


(1)	Included in “Cash and cash equivalents” in the accompanying Consolidated Balance Sheets.


(2)	Considered "available for sale" securities and included in "Other assets" in the accompanying Consolidated Balance Sheets.


(3)	Included in “Prepaid expenses and other current assets,” "Other assets," or “Other accrued liabilities” in the accompanying Consolidated Balance Sheets.


(4)	Included in “Other accrued liabilities” in the accompanying Consolidated Balance Sheets.

Autodesk classifies its marketable securities as either short-term or long-term based on each instrument’s underlying contractual maturity date. Generally marketable securities with remaining maturities of less than 12 months are classified as short-term and marketable securities with remaining maturities greater than 12 months are classified as long-term. Autodesk may sell certain of its marketable securities prior to their stated maturities for strategic purposes or in anticipation of credit deterioration.

Autodesk applies fair value accounting for certain financial assets and liabilities, which consist of cash equivalents, marketable securities, and other financial instruments, on a recurring basis. The Company defines fair value as the price that

would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value is estimated by applying the following hierarchy, which prioritizes the inputs used to measure fair value into three levels and bases the categorization within the hierarchy upon the lowest level of input that is available and significant to the fair value measurement: (Level 1) observable inputs such as quoted prices in active markets; (Level 2) inputs other than quoted prices in active markets for identical assets and liabilities, quoted prices for identical or similar assets or liabilities in inactive markets, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities; and (Level 3) unobservable inputs for which there is little or no market data, which require Autodesk to develop its own assumptions. When determining fair value, Autodesk uses observable market data and relies on unobservable inputs only when observable market data is not available. There have been no transfers between fair value measurement levels during the year ended January 31, 2018.

Autodesk's cash equivalents, marketable securities, and financial instruments are primarily classified within Level 1 or Level 2 of the fair value hierarchy. Autodesk values it's available for sale securities on pricing from pricing vendors, who may use quoted prices in active markets for identical assets (Level 1) or inputs other than quoted prices that are observable either directly or indirectly in determining fair value (Level 2). Autodesk's Level 2 securities are valued primarily using observable inputs other than quoted prices in active markets for identical assets and liabilities. Autodesk's Level 3 securities consist of investments held in convertible debt securities, and derivative contracts which are valued using probability weighted discounted cash flow models as some of the inputs to the models are unobservable in the market.

A reconciliation of the change in Autodesk’s Level 3 items for the fiscal year ended January 31, 2018 was as follows:



	Fair Value Measurements Using Significant Unobservable Inputs
	(Level 3)
		Derivative Contracts			Convertible Debt Securities			Total
Balances, January 31, 2017		$	1.3		$	5.6		$	6.9
Purchases		1.1			5.9			7.0
Gains (losses) included in earnings (1)		(1.4		)	(3.2		)	(4.6		)
Gains included in OCI		—			(0.5		)	(0.5		)
Balances, January 31, 2018		$	1.0		$	7.8		$	8.8

____________________


(1)	Included in “Interest and other expense, net” in the accompanying Consolidated Statement of Operations.

The following table summarizes the estimated fair value of Autodesk's “available-for-sale securities” classified by the contractual maturity date of the security:



	January 31, 2018
	Cost		Fair Value
Due within in 1 year	$	193.8	$	194.0
Due in 1 year through 5 years	186.9		186.0
Due in 5 years through 10 years	3.7		3.7
Due after 10 years	1.1		1.1
Total	$	385.5	$	384.8

As of January 31, 2018, and 2017, Autodesk had no material securities, individually and in the aggregate, in a continuous unrealized loss position for greater than twelve months.

As of January 31, 2018, and 2017, Autodesk had $112.3 million and $117.2 million, respectively, in direct investments in privately held companies accounted for under the cost method, which are periodically assessed for other-than-temporary impairment. , Autodesk does not intend to sell these cost method investments and it is not more likely than not that Autodesk will be required to sell the investment before recovery of the amortized cost bases, which may be maturity. Therefore, Autodesk does not consider those investments to be other-than-temporarily impaired at January 31, 2018. Autodesk estimates fair value of its cost method investments considering available information such as pricing in recent rounds of financing, current cash positions, earnings and cash flow forecasts, recent operational performance, and any other readily available market data.

If Autodesk determines that an other-than-temporary impairment has occurred, Autodesk writes down the investment to its fair value. During fiscal 2018 and 2017, Autodesk recorded $15.5 million and $1.3 million, respectively, in other-than-temporary impairment on its privately held equity and debt investments. The impairment expense was recorded in “Interest and other expense, net” on the Company's Consolidated Statements of Operations.

The sales or redemptions of “available-for-sale securities” in fiscal 2018, 2017, and 2016 resulted in a loss of $0.3 million, gain of $1.5 million, and gain of $0.1 million, respectively. The loss and gains were recorded in "Interest and other expense, net" on the Company's Consolidated Statements of Operations.

Proceeds from the sale and maturity of marketable securities for fiscal 2018 and fiscal 2017 were $1.1 billion and $2.3 billion, respectively.

Derivative Financial Instruments

Under its risk management strategy, Autodesk uses derivative instruments to manage its short-term exposures to fluctuations in foreign currency exchange rates which exist as part of ongoing business operations. Autodesk's general practice is to hedge a portion of transaction exposures denominated in euros, Japanese yen, Swiss francs, British pounds, Canadian dollars and Australian dollars. These instruments have maturities between one and twelve months in the future. Autodesk does not enter into derivative instrument transactions for trading or speculative purposes.

Foreign currency contracts designated as cash flow hedges

Autodesk uses foreign currency contracts to reduce the exchange rate impact on a portion of the net revenue or operating expense of certain anticipated transactions. These contracts are designated and documented as cash flow hedges. The effectiveness of the cash flow hedge contracts is assessed quarterly using regression analysis as well as other timing and probability criteria. To receive cash flow hedge accounting treatment, all hedging relationships are formally documented at the inception of the hedge and the hedges are expected to be highly effective in offsetting changes to future cash flows on hedged transactions. The gross gains and losses on these hedges are included in “Accumulated other comprehensive loss” and are reclassified into earnings at the time the forecasted revenue or expense is recognized. In the event the underlying forecasted transaction does not occur, or it becomes probable that it will not occur, Autodesk reclassifies the gain or loss on the related cash flow hedge from “Accumulated other comprehensive loss” to “Interest and other expense, net” in the Company's Consolidated Financial Statements at that time.

The net notional amounts of these contracts are presented net settled and were $619.9 million at January 31, 2018 and $369.4 million at January 31, 2017. Outstanding contracts are recognized as either assets or liabilities on the balance sheet at fair value. The majority of the net loss of $16.6 million remaining in “Accumulated other comprehensive loss” as of January 31, 2018, is expected to be recognized into earnings within the next twelve months.

Derivatives not designated as hedging instruments

Autodesk uses foreign currency contracts that are not designated as hedging instruments to reduce the exchange rate risk associated primarily with foreign currency denominated receivables, payables, and cash. These forward contracts are marked-to-market at the end of each month with gains and losses recognized as “Interest and other expense, net.” These derivative instruments do not subject the Company to material balance sheet risk due to exchange rate movements because gains and losses on these derivative instruments are intended to offset the gains or losses resulting from the revaluation and settlement of the underlying foreign currency denominated receivables, payables, and cash. The net notional amounts of these foreign currency contracts are presented net settled and were $329.6 million at January 31, 2018, and $270.6 million at January 31, 2017.

In addition to these foreign currency contracts, Autodesk holds derivative instruments issued by privately held companies, which are not designated as hedging instruments. These derivatives consist of certain conversion options on the convertible debt securities held by Autodesk and an option to acquire a privately held company. These derivatives are recorded at fair value as of each balance sheet date and are recorded in “Other assets.” Changes in the fair values of these instruments are recognized in “Interest and other expense, net.”

Fair Value of Derivative Instruments:

The fair value of derivative instruments in Autodesk’s Consolidated Balance Sheets were as follows as of January 31, 2018, and January 31, 2017:



	Balance Sheet Location	Fair Value at
	Balance Sheet Location	January 31, 2018		January 31, 2017
Derivative Assets
Foreign currency contracts designated as cash flow hedges	Prepaid expenses and other current assets	$	6.2	$	10.1
Derivatives not designated as hedging instruments	Prepaid expenses and other current assets and Other assets	2.0		3.2
Total derivative assets		$	8.2	$	13.3
Derivative Liabilities
Foreign currency contracts designated as cash flow hedges	Other accrued liabilities	$	18.7	$	4.5
Derivatives not designated as hedging instruments	Other accrued liabilities	7.9		6.0
Total derivative liabilities		$	26.6	$	10.5

The effects of derivatives designated as hedging instruments on Autodesk’s Consolidated Statements of Operations were as follows for the fiscal years ended January 31, 2018, 2017, and 2016, respectively (amounts presented include any income tax effects):



	Foreign Currency Contracts
	Fiscal Year Ended January 31,
	2018			2017			2016
Amount of (loss) gain recognized in accumulated other comprehensive loss on derivatives (effective portion)	$	(21.3	)	$	6.3		$	2.2
Amount and location of gain (loss) reclassified from accumulated other comprehensive loss into (loss) income (effective portion)
Net revenue	$	8.0		$	9.2		$	39.8
Operating expenses	1.9			(1.8		)	(10.5		)
Total	$	9.9		$	7.4		$	29.3
Amount and location of loss recognized in (loss) income on derivatives (ineffective portion and amount excluded from effectiveness testing)
Interest and other expense, net	$	(0.2	)	$	(0.3	)	$	(0.7	)

The effects of derivatives not designated as hedging instruments on Autodesk’s Consolidated Statements of Operations were as follows for the fiscal years ended January 31, 2018, 2017, and 2016, respectively (amounts presented include any income tax effects):



	Fiscal Year Ended January 31,
	2018			2017			2016
Amount and location of loss recognized in loss (income) on derivatives
Interest and other expense, net	$	(19.1	)	$	(11.1	)	$	(1.7	)

Employee and Director Stock Plans

12 Months Ended

Jan. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Employee and Director Stock Plans

Stock Plans

As of January 31, 2018, Autodesk maintained two active stock plans for the purpose of granting equity awards to employees and to non-employee members of Autodesk’s Board of Directors: the 2012 Employee Stock Plan (as amended, the “2012 Employee Plan”), which is available only to employees, and the Autodesk 2012 Outside Directors’ Stock Plan (“2012 Directors' Plan”), which is available only to non-employee directors.

The 2012 Employee Plan was approved by Autodesk's stockholders and became effective on January 6, 2012. Since the 2012 Stock Plan was adopted by stockholders in January 2012, Autodesk has received stockholder approval to increase the number of shares subject to the plan by 36.1 million shares. The 2012 Employee Plan replaced the 2008 Employee Stock Plan, as amended ("2008 Plan"), and no further equity awards may be granted under the 2008 Plan. The 2012 Employee Plan reserves up to 57.3 million shares which includes 51.3 million shares reserved under the 2012 Employee Plan, as well as up to 6.0 million shares forfeited under certain prior employee stock plans during the life of the 2012 Employee Plan. The 2012 Employee Plan permits the grant of stock options, restricted stock units, and restricted stock awards. Each restricted stock unit or restricted stock award granted will be counted against the shares authorized for issuance under the 2012 Employee Plan as 1.79 shares. If a granted option, restricted stock unit, or restricted stock award expires or becomes unexercisable for any reason, the unpurchased or forfeited shares that were granted may be returned to the 2012 Employee Plan and may become available for future grant under the 2012 Employee Plan. As of January 31, 2018, 41.1 million shares subject to options or restricted stock awards have been granted under the 2012 Employee Plan. Options and restricted stock that were granted under the 2012 plan vest over periods ranging from immediately upon grant to over a three year period and options expire 10 years from the date of grant. The 2012 Employee Plan will expire on June 30, 2022. At January 31, 2018, 21.3 million shares were available for future issuance under the 2012 Employee Plan.

The 2012 Director's Plan was approved by Autodesk's stockholders and became effective on January 6, 2012. The 2012 Directors' Plan replaced the 2010 Outside Directors' Stock Plan, as amended ("2010 Plan"). The 2012 Directors' Plan permits the grant of stock options, restricted stock units, and restricted stock awards to non-employee members of Autodesk’s Board of Directors. Each restricted stock unit or restricted stock award granted will be counted against the shares authorized for issuance under the 2012 Directors' Plan as 2.11 shares. As of January 31, 2018, 0.9 million shares subject to restricted stock unit awards have been granted under the 2012 Directors' Plan. Restricted stock units that were granted under the 2012 Outside Directors' Plan vest over one to three years from the date of grant. On March 12, 2015, the Board reduced the number of shares reserved for issuance under the 2012 Directors' Plan by 0.9 million shares, so that 1.7 million shares are now reserved for issuance under the 2012 Directors' Plan. The 2012 Directors' Plan will expire on June 30, 2022. At January 31, 2018, 0.9 million shares were available for future issuance under the 2012 Director's Plan.

The following sections summarize activity under Autodesk’s stock plans.

Stock Options:

A summary of stock option activity for the fiscal year ended January 31, 2018 is as follows:



	Number of Shares (in millions)		Weighted average exercise price per share		Weighted average remaining contractual term (in years)	Aggregate Intrinsic Value (1) (in millions)
Options outstanding at January 31, 2017	0.6		$	39.25
Exercised	(0.4	)	38.66
Options vested, exercisable and outstanding at January 31, 2018	0.2		$	40.49	2.87	$	16.4
Shares available for grant at January 31, 2018	22.2

_______________


(1)	Represents the total pre-tax intrinsic value, based on Autodesk’s closing stock price of $115.62 per share as of January 31, 2018, which would have been received by the option holders had all option holders exercised their options as of that date.

As of January 31, 2018, compensation cost related to stock options has been fully recognized.

The following table summarizes information about the pre-tax intrinsic value of options exercised during the fiscal years ended January 31, 2018, 2017, and 2016:



	Fiscal year ended January 31,
	2018		2017		2016
Pre-tax intrinsic value of options exercised (1)	$	22.8	$	32.0	$	32.6

——————


(1)	The intrinsic value of options exercised is calculated as the difference between the exercise price of the option and the market value of the stock on the date of exercise.

The following table summarizes information about options vested and exercisable, and outstanding at January 31, 2018:



	Number of Shares (in thousands)	Weighted average exercise price per share
Range of per-share exercise prices:
$28.56 - $36.44	32.6	$	34.23
$38.55 - $38.55	1.8	38.55
$41.62 - $41.62	184.4	41.62
	218.8	$	40.49

These options will expire if not exercised at specific dates ranging through September 2022.

Restricted Stock Units:

A summary of restricted stock activity for the fiscal year ended January 31, 2018 is as follows:



	Unreleased Restricted Stock Units (in thousands)		Weighted average grant date fair value per share
Unvested restricted stock at January 31, 2017	7,622.4		$	60.13
Granted	2,481.8		106.55
Vested	(3,765.7	)	57.85
Canceled/Forfeited	(692.5	)	69.08
Performance Adjustment (1)	24.7		61.79
Unvested restricted stock at January 31, 2018	5,670.7		$	82.94

_______________


(1)	Based on Autodesk's financial results and relative total stockholder return for the fiscal 2017 performance period. The performance stock units were attained at rates ranging from 99.7% to 114.7% of the target award.

For the restricted stock granted during fiscal years ended January 31, 2018, 2017, and 2016, the weighted average grant date fair value was $106.55, $65.95, and $52.53, respectively. The fair value of the shares vested during fiscal years ended January 31, 2018, 2017, and 2016 was $399.7 million, $232.2 million, and $193.3 million, respectively.

During the fiscal year ended January 31, 2018, Autodesk granted 2.2 million restricted stock units. Restricted stock units vest over periods ranging from immediately upon grant to a pre-determined date that is typically within three years from the date of grant. Restricted stock units are not considered outstanding stock at the time of grant, as the holders of these units are not entitled to any of the rights of a stockholder, including voting rights. The fair value of the restricted stock units is expensed ratably over the vesting period. Autodesk recorded stock-based compensation expense related to restricted stock units of $202.1 million, $173.0 million, and $146.4 million during fiscal years ended January 31, 2018, 2017, and 2016, respectively. As of January 31, 2018, total compensation cost not yet recognized of $310.2 million related to non-vested awards, is expected to be recognized over a weighted average period of 1.65 years. At January 31, 2018, the number of restricted stock units granted but unvested was 5.1 million.

During the fiscal year ended January 31, 2018, Autodesk granted 0.3 million performance stock units for which the ultimate number of shares earned is determined based on the achievement of performance criteria at the end of the stated service and performance period. During the period, Autodesk granted two different types of performance stock units.

The performance criteria for the first type of performance stock units were based on a mix of net subscription additions, Annualized Recurring Revenue ("ARR"), non-GAAP total spend, and total subscription renewal rate goals adopted by the Compensation and Human Resource Committee, as well as total stockholder return compared against companies in the S&P Computer Software Select Index or the S&P North American Technology Software Index ("Relative TSR"). These performance stock units vest over a three-year period and have the following vesting schedule:


•	Up to one third of the performance stock units may vest following year one, depending upon the achievement of the performance criteria for fiscal 2018 as well as 1-year Relative TSR (covering year one).


•	Up to one third of the performance stock units may vest following year two, depending upon the achievement of the performance criteria for year two as well as 2-year Relative TSR (covering years one and two).


•	Up to one third of the performance stock units may vest following year three, depending upon the achievement of the performance criteria for year three as well as 3-year Relative TSR (covering years one, two and three).

The performance criteria for the second type of performance stock units granted to our Chief Executive Officer during the fiscal year ended January 31, 2018 were based on fiscal 2020 free cash flow per share and ARR goals adopted by the Compensation and Human Resource Committee. These performance stock units vest in March 2020 based on the Company's fiscal 2020 performance against the performance criteria.

Performance stock units are not considered outstanding stock at the time of grant, as the holders of these units are not entitled to any of the rights of a stockholder, including voting rights. Autodesk has determined the grant-date fair value for these awards using the stock price on the date of grant or if the awards are subject to a market condition, a Monte Carlo simulation model. The fair value of the performance stock units is expensed using the accelerated attribution over the vesting period. Autodesk recorded stock-based compensation expense related to performance stock units of $33.7 million, $22.9 million, and $23.2 million during fiscal years ended January 31, 2018, 2017, and 2016 respectively. As of January 31, 2018, total compensation cost not yet recognized of $6.8 million related to unvested performance stock units, is expected to be recognized over a weighted average period of 0.76 years. At January 31, 2018, the number of performance stock units granted but unvested was 0.6 million. Autodesk recorded stock-based compensation expense related to the acceleration of eligible performance stock awards in conjunction with the Company's former CEO transition agreement of $7.3 million for the fiscal year ended January 31, 2018.

1998 Employee Qualified Stock Purchase Plan (“ESPP”)

Under Autodesk’s ESPP, which was approved by stockholders in 1998, eligible employees may purchase shares of Autodesk’s common stock at their discretion using up to 15% of their eligible compensation, subject to certain limitations, at 85% of the lower of Autodesk's closing price (fair market value) on the offering date or the exercise date. The offering period for ESPP awards consists of four, six-month exercise periods within a 24-month offering period.

At January 31, 2018, a total of 9.1 million shares were available for future issuance. Under the ESPP, the Company issues shares on the first trading day following March 31 and September 30 of each fiscal year. The ESPP expires during fiscal 2018.

A summary of the ESPP activity for the years ended January 31, 2018, 2017 and 2016 is as follows:



	Fiscal Year Ended January 31,
	2018		2017		2016
Issued shares	2.0		2.3		2.1
Average price of issued shares	$	39.03	$	36.99	$	36.29
Weighted average grant date fair value of awards granted under the ESPP	$	32.41	$	19.20	$	11.85

Autodesk recorded $25.7 million, $25.9 million, and $27.1 million of compensation expense associated with the ESPP in fiscal 2018, 2017, and 2016, respectively.

Equity Compensation Plan Information

The following table summarizes the number of outstanding options and awards granted to employees and directors, as well as the number of securities remaining available for future issuance under these plans as of January 31, 2018:



	(a)	(b)		(c)
Plan category	Number of securities to be issued upon exercise of outstanding options (in millions)	Weighted-average exercise price of outstanding options		Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column (a)) (in millions)
Equity compensation plans approved by security holders	5.9	$	40.49	31.3	(1)
Total	5.9	$	40.49	31.3

____________________

(1)

Included in this amount are 9.1 million securities available for future issuance under Autodesk’s ESPP.

Income Taxes

12 Months Ended

Jan. 31, 2018

Income Tax Disclosure [Abstract]

Income Taxes

The provision for income taxes consists of the following:



	Fiscal year ended January 31,
	2018			2017			2016
Federal:
Current	$	(0.8	)	$	1.6		$	(4.7	)
Deferred	(19.3		)	8.4			220.9
State:
Current	(0.3		)	(1.9		)	0.5
Deferred	2.2			1.3			20.9
Foreign:
Current	50.9			93.9			68.4
Deferred	(23.1		)	(45.0		)	4.2
	$	9.6		$	58.3		$	310.2

Foreign pretax (loss) income was $(76.2) million in fiscal 2018, $(27.6) million in fiscal 2017, and $218.2 million in fiscal 2016.

The differences between the U.S. statutory rate and the aggregate income tax provision are as follows:



	Fiscal year ended January 31,
	2018			2017			2016
Income tax provision (benefit) at U.S. Federal statutory rate	$	(188.4	)	$	(177.0	)	$	(7.1	)
State income tax benefit, net of the U.S. Federal benefit	(21.9		)	(17.3		)	(7.6		)
Foreign income taxed at rates different from the U.S. statutory rate	(53.3		)	22.3			(29.4		)
U.S. valuation allowance	(82.5		)	233.0			345.0
Transition tax	408.4			—			—
Increase in attributes due to ASU 2016-9 adoption				(119.4		)	—
Change in valuation allowance from ASU 2016-9 adoption	—			119.4			—
Tax effect of non-deductible stock-based compensation	20.7			18.8			19.3
Stock compensation windfall / shortfall	(67.7		)	(23.0		)	—
Research and development tax credit benefit	(11.3		)	(10.3		)	(9.4		)
Closure of income tax audits and changes in uncertain tax positions	1.2			8.2			(4.7		)
Tax effect of officer compensation in excess of $1.0 million	2.2			2.2			1.4
Non-deductible expenses	2.1			2.0			2.6
Other	0.1			(0.6		)	0.1
	$	9.6		$	58.3		$	310.2

Significant components of Autodesk’s deferred tax assets and liabilities are as follows:



	January 31,
	2018			2017
Stock-based compensation	$	26.7		$	37.6
Research and development tax credit carryforwards	170.3			136.7
Foreign tax credit carryforwards	162.2			127.3
Accrued compensation and benefits	25.9			39.5
Other accruals not currently deductible for tax	22.9			18.7
Purchased technology and capitalized software	43.4			76.9
Fixed assets	16.5			24.3
Tax loss carryforwards	85.7			173.6
Deferred revenue	120.3			128.3
Other	32.4			27.6
Total deferred tax assets	706.3			790.5
Less: valuation allowance	(634.2		)	(748.0		)
Net deferred tax assets	72.1			42.5
Indefinite lived intangibles	(57.0		)	(70.1		)
Total deferred tax liabilities	(57.0		)	(70.1		)
Net deferred tax assets	$	15.1		$	(27.6	)

Autodesk’s tax expense is primarily driven by the reduction in the U.S. tax rate from 35% to 21% on the deferred tax liabilities related to indefinite lived intangibles offset by tax expense in foreign locations, withholding taxes paid on payments made to the U.S. from foreign sources, and tax amortization on indefinite-lived intangibles.

Autodesk regularly assesses the need for a valuation allowance against its deferred tax assets. In making that assessment, Autodesk considers both positive and negative evidence, whether it is more likely than not that some or all of the deferred tax assets will not be realized. In evaluating the need for a valuation allowance, Autodesk considered cumulative losses arising from the Company's business model transition as a significant piece of negative evidence. Consequently, in the fiscal year 2016, Autodesk determined that a valuation allowance was required on the accumulated domestic tax attributes. In the current year,

the U.S. created incremental deferred tax assets, primarily foreign tax and R&D credits, and those deferred tax attributes have also been offset by a full valuation allowance. As a result, Autodesk has no material federal income tax expense or benefit in the current fiscal year, other than the deferred tax liabilities related to indefinite lived intangibles and the revaluation of these liabilities as a result of U.S. tax reform. The valuation allowance decreased by $113.8 million in fiscal 2018 primarily due to a change in tax rates used to value deferred tax attributes. The valuation allowance increased by $352.4 million, and $327.2 million in fiscal 2017, and 2016, respectively, primarily related to U.S. and Canadian deferred tax attributes. As Autodesk continually strives to optimize the overall business model, tax planning strategies may become feasible and prudent allowing the Company to realize many of the deferred tax assets that are offset by a valuation allowance; therefore, Autodesk will continue to evaluate the ability to utilize the net deferred tax assets each quarter, both in the U.S. and in foreign jurisdictions, based on all available evidence, both positive and negative.

The Tax Act was signed into law on December 22, 2017 and provides broad and significant changes to the U.S. corporate income tax regime. The Tax Act reduces the statutory federal corporate rate from 35% to 21% effective fiscal 2019 year and forward and provides for a blended rate of 33.81% to fiscal 2018 year. The Tax Act also, among many other provisions, imposes a one-time mandatory tax on accumulated earnings of foreign subsidiaries (commonly referred to as a "transition tax"), introduces new tax regimes changing how foreign earnings are subject to U.S. tax, modifies the accelerated depreciation deduction rules, and makes updates to the deductibility of certain expenses. The SEC staff acknowledged the challenges companies face incorporating the effects of the Tax Act by the financial reporting deadlines. In response, on December 22, 2017, the SEC staff issued SAB 118 to address the application of U.S. GAAP in situations when a registrant does not have the necessary information available, prepared, or analyzed in reasonable detail to complete accounting for certain income tax effects of the Tax Act. Autodesk has not completed the determination of the accounting implications of the Tax Act but was able to calculate a reasonable estimate and recorded a provisional tax benefit of the Tax Act in the financial statements of approximately $32.3 million mainly driven by the corporate rate remeasurement of the indefinite-lived intangible deferred tax liability. The provisional amounts recorded are based on the Company’s current interpretation and understanding of the Tax Act and may change as the Company receives additional clarification and implementation guidance and finalizes the analysis of all impacts and positions with regard to the Tax Act. The tax impact of the mandatory one-time tax on accumulated earnings of foreign subsidiaries is primarily offset by other current year operating losses and fully valued net operating loss carryforwards resulting in no impact to the effective tax rate. As additional regulatory guidance is issued, the Company will continue to collect and analyze necessary data and may adjust provisional amounts previously recorded in the period in which the adjustments are made. Pursuant to SAB 118, the Company will complete the accounting for the tax effects of all provisions of the Tax Act within the required measurement period not to extend beyond one year from the enactment date.

Realization of foreign non-current net deferred tax assets of $68.0 million is dependent upon the Company's ability to generate future taxable income in appropriate tax jurisdictions to obtain benefit from the reversal of temporary differences, net operating loss carryforwards and tax credits. The amount of deferred tax assets considered realizable is subject to adjustment in future periods if estimates of future taxable income are reduced and Autodesk then determines that it is not more likely than not to realize such deferred tax assets.

As of January 31, 2018, Autodesk had $179.4 million of cumulative federal tax loss carryforwards and $939.1 million of cumulative state tax loss carryforwards, which may be available to reduce future income tax liabilities in federal and state jurisdictions. As discussed above, these cumulative assets have full valuation allowance against them on our balance sheet as the Company has determined it is more likely that not that these losses will not be utilized. These federal and state tax loss carryforwards will expire beginning fiscal 2021 through fiscal 2038 and fiscal 2020 through fiscal 2039, respectively.

As of January 31, 2018, Autodesk had $138.4 million of cumulative federal research tax credit carryforwards, $72.6 million of cumulative California state research tax credit carryforwards, and $58.1 million of cumulative Canadian federal tax credit carryforwards, which may be available to reduce future income tax liabilities in the respective jurisdictions. The federal tax credit carryforwards will expire beginning fiscal 2021 through fiscal 2039, the state credit carryforwards may reduce future California income tax liabilities indefinitely, and the Canadian tax credit carryforwards will expire beginning fiscal 2027 through fiscal 2039. Autodesk also has $336.9 million of cumulative foreign tax credit carryforwards, which may be available to reduce future U. S. tax liabilities. The foreign tax credit will expire beginning fiscal 2019 through fiscal 2029. As discussed above, these cumulative assets have full valuation allowance against them on our balance sheet as the Company has determined it is more likely that not that these losses will not be utilized.

Utilization of net operating losses and tax credits may be subject to an annual limitation due to ownership change limitations provided in the Internal Revenue Code and similar state provisions. This annual limitation may result in the expiration of net operating losses and credits before utilization. No ownership change has occurred through the balance sheet date that would limit a material amount of U.S. federal and state tax attributes.

As of January 31, 2018, the Company had $337.6 million of gross unrecognized tax benefits, of which $304.8 million would reduce our valuation allowance, if recognized. The remaining $32.8 million would impact the effective tax rate.

It is possible that the amount of unrecognized tax benefits will change in the next twelve months; however, an estimate of the range of the possible change cannot be made at this time.

A reconciliation of the beginning and ending amount of the gross unrecognized tax benefits is as follows:



	Fiscal Year Ended January 31,
	2018			2017			2016
Gross unrecognized tax benefits at the beginning of the fiscal year	$	261.4		$	254.3		$	245.8
Increases for tax positions of prior years	22.8			11.9			1.4
Decreases for tax positions of prior years	(22.5		)	(4.1		)	(7.0		)
Increases for tax positions related to the current year	78.4			11.1			15.8
Decreases relating to settlements with taxing authorities	(0.8		)	(10.8		)	(0.5		)
Reductions as a result of lapse of the statute of limitations	(1.7		)	(1.0		)	(1.2		)
Gross unrecognized tax benefits at the end of the fiscal year	$	337.6		$	261.4		$	254.3

It is the Company's continuing practice to recognize interest and/or penalties related to income tax matters in income tax expense. Autodesk had $2.8 million, $2.5 million, and $3.3 million, net of tax benefit, accrued for interest and penalties related to unrecognized tax benefits as of January 31, 2018, 2017, and 2016, respectively. There was $0.3 million, $1.5 million, and $1.3 million of net expense for interest and penalties related to tax matters recorded through the consolidated statement of operations for the years ended January 31, 2018, 2017, and 2016 respectively.

Autodesk's U.S. and state income tax returns for fiscal year 2003 through fiscal year 2018 remain open to examination. The Internal Revenue Service has started an examination of the Company's U.S. consolidated federal income tax returns for fiscal years 2014 and 2015. While it is possible that the Company's tax positions may be challenged, the Company believes its positions are consistent with the tax law, and the balance sheet reflects appropriate liabilities for uncertain federal tax positions for the years being examined.

Autodesk files tax returns in multiple foreign taxing jurisdictions with open tax years ranging from fiscal year 2005 to 2018.

As a result of certain business and employment actions and capital investments undertaken by Autodesk, income earned in certain Europe and Asia Pacific countries is subject to reduced tax rates through fiscal 2019. In fiscal 2018, the Company incurred no net benefit from the tax status of these business arrangements, compared to $27.1 million benefit ($0.12 basic net income per share) in fiscal 2017, and none in fiscal 2016.

Acquisitions

12 Months Ended

Jan. 31, 2018

Business Combinations [Abstract]

Acquisitions

During the fiscal years ended January 31, 2018, and January 31, 2017, Autodesk completed the business combinations and technology purchases described below. The results of operations for the following acquisitions are included in the accompanying Consolidated Statements of Operations since their respective acquisition dates. Pro forma results of operations have not been presented because the effects of the acquisitions, individually and in the aggregate, were not material to Autodesk's Consolidated Financial Statements.

For acquisitions accounted for as business combinations, Autodesk recorded the tangible and intangible assets acquired and liabilities assumed based on their estimated fair values at the date of acquisition. The fair values assigned to the identifiable intangible assets acquired were based on estimates and assumptions determined by management. Autodesk recorded the excess of consideration transferred over the aggregate fair values as goodwill. The goodwill recorded is primarily attributable to synergies expected to arise after the acquisitions.

Fiscal 2018 Acquisitions

During the fiscal year ended January 31, 2018, Autodesk did not complete any business combinations or technology acquisitions.

Fiscal 2017 Acquisitions

During the fiscal year ended January 31, 2017, Autodesk completed several business combination and technology acquisitions for total cash consideration of $87.0 million. These business combinations and technology acquisitions were not material individually or in aggregate to Autodesk's Consolidated Financial Statements.

The following table summarizes the fair value of the assets acquired and liabilities assumed by major class for each of the business combinations and technology acquisitions completed during the fiscal year ended January 31, 2017:



Developed technologies	$	18.8
Customer relationships	10.2
Trade name	3.8
Goodwill	62.8
Deferred revenue (current and non-current)	(2.1		)
Deferred tax liability	(7.1		)
Net tangible (liabilities) assets	0.6
Total	$	87.0

Deferred Compensation	12 Months Ended
Deferred Compensation	Jan. 31, 2018
Compensation Related Costs [Abstract]
Deferred Compensation	Deferred Compensation At January 31, 2018, Autodesk had marketable securities totaling $436.0 million, of which $59.0 million related to investments in debt and equity securities that are held in a rabbi trust under non-qualified deferred compensation plans. The total related deferred compensation liability was $59.0 million at January 31, 2018, of which $3.4 million was classified as current and $55.6 million was classified as non-current liabilities. The total related deferred compensation liability at January 31, 2017 was $47.3 million, of which $3.1 million was classified as current and $44.2 million was classified as non-current liabilities. The securities are recorded in the Consolidated Balance Sheets under the current portion of "Marketable securities". The current and non-current portions of the liability are recorded in the Consolidated Balance Sheets under “Accrued compensation” and “Other liabilities,” respectively.

Borrowing Arrangements	12 Months Ended
Borrowing Arrangements	Jan. 31, 2018
Debt Disclosure [Abstract]
Borrowing Arrangements	Borrowing Arrangements In June 2017, Autodesk issued $500.0 million aggregate principal amount of 3.5% notes due June 15, 2027 (collectively, the “2017 Notes”). Net of a discount of $3.1 million and issuance costs of $4.9 million, Autodesk received net proceeds of $492.0 million from issuance of the 2017 Notes. Both the discount and issuance costs are being amortized to interest expense over the term of the 2017 Notes using the effective interest method. The proceeds of the 2017 Notes have been used for the repayment of $400.0 million of debt originally due December 15, 2017 and the remainder is available for general corporate purposes. Autodesk may redeem the 2017 Notes at any time, subject to a make whole premium. In addition, upon the occurrence of certain change of control triggering events, Autodesk may be required to repurchase the 2017 Notes at a price equal to 101.0% of their principal amount, plus accrued and unpaid interest to the date of repurchase. The 2017 Notes contain restrictive covenants that limit Autodesk's ability to create certain liens, to enter into certain sale and leaseback transactions and to consolidate or merge with, or convey, transfer or lease all or substantially all of its assets, subject to important qualifications and exceptions. Based on quoted market prices, the fair value of the 2017 Notes was approximately $485.6 million as of January 31, 2018. In June 2015, Autodesk issued $450.0 million aggregate principal amount of 3.125% senior notes due June 15, 2020 and $300.0 million aggregate principal amount of 4.375% senior notes due June 15, 2025 (collectively, the “2015 Notes”). Net of a discount of $1.7 million and issuance costs of $6.3 million, Autodesk received net proceeds of $742.0 million from issuance of the 2015 Senior Notes. Both the discount and issuance costs are being amortized to interest expense over the respective terms of the 2015 Notes using the effective interest method. The proceeds of the 2015 Notes are available for general corporate purposes. Autodesk may redeem the 2015 Notes at any time, subject to a make whole premium. In addition, upon the occurrence of certain change of control triggering events, Autodesk may be required to repurchase the 2015 Notes, at a price equal to 101% of their principal amount, plus accrued and unpaid interest to the date of repurchase. The 2015 Notes contain restrictive covenants that limit Autodesk's ability to create certain liens, to enter into certain sale and leaseback transactions and to consolidate or merge with, or convey, transfer or lease all or substantially all of its assets, subject to significant qualifications and exceptions. Based on quoted market prices, the fair value of the 2015 Notes was approximately $763.8 million as of January 31, 2018. In December 2012, Autodesk issued $400.0 million aggregate principal amount of 1.95% senior notes due December 15, 2017 and $350.0 million aggregate principal amount of 3.6% senior notes due December 15, 2022 (collectively, the "2012 Notes"). Autodesk received net proceeds of $739.3 million from issuance of the 2012 Notes, net of a discount of $4.5 million and issuance costs of $6.1 million. Both the discount and issuance costs are being amortized to interest expense over the respective terms of the 2012 Notes using the effective interest method. The proceeds of the 2012 Notes are available for general corporate purposes. In July 2017, Autodesk redeemed in full $400.0 million in aggregate principal amount of its outstanding 1.95% senior notes due December 15, 2017. The redemption was completed pursuant to the optional redemption provisions of the first supplemental indenture dated December 13, 2012. To redeem the notes, Autodesk used the proceeds of the 2017 Notes to pay a redemption price of approximately $400.9 million, plus accrued and unpaid interest. Total cash repayment was $401.8 million. The Company did not incur any additional early termination penalties in connection with such redemption. Based on the quoted market price, the fair value of the remaining 2012 Notes was approximately $354.4 million as of January 31, 2018. Autodesk’s line of credit facility permits unsecured short-term borrowings of up to $400.0 million with an option to request an increase in the amount of the credit facility by up to an additional $100.0 million, and is available for working capital or other business needs. This credit agreement contains customary covenants that could restrict the imposition of liens on Autodesk’s assets, and restrict the Company’s ability to incur additional indebtedness or make dispositions of assets if Autodesk fails to maintain the financial covenants. The Company renegotiated the credit agreement's financial covenants in April 2017. The financial covenants now consist of a maximum debt to total cash ratio, a fixed charge coverage ratio through April 30, 2018, and after April 30, 2018, a minimum interest coverage ratio. The line of credit is syndicated with various financial institutions, including Citibank, N.A., an affiliate of Citigroup, which is one of the lead lenders and an agent. The maturity date on the line of credit facility is May 2020. At January 31, 2018, Autodesk was in compliance with the credit facility’s covenants. At January 31, 2018, and January 31, 2017, Autodesk had no outstanding borrowings on this line of credit.

Commitments and Contingencies

12 Months Ended

Jan. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Lease commitments

Autodesk leases office space and computer equipment under non-cancellable operating lease agreements that expire at various dates through 2090. The leases generally provide that Autodesk pay taxes, insurance, and maintenance expenses related to the leased assets. Certain of these lease arrangements contain escalation clauses whereby monthly rent increases over time.

At January 31, 2018, the aggregate future minimum lease payments required were as follows:




2019	$	62.2
2020	46.3
2021	34.1
2022	24.7
2023	22.8
Thereafter	57.7
	247.8
Less: Sublease income	0.8
	$	247.0

Rent expense related to these operating leases recognized on a straight-line basis over the lease period, was as follows:



	Fiscal Year Ended January 31,
	2018		2017		2016
Rent expense	$	55.9	$	65.3	$	58.7

Purchase commitments

In the normal course of business, Autodesk enters into various purchase commitments for goods or services. Total non-cancellable purchase commitments as of January 31, 2018, were approximately $147.6 million for periods through fiscal 2028. These purchase commitments primarily result from contracts entered into for the acquisition of IT infrastructure, marketing, and software development services, as well as includes commitments related to our investment agreements with limited liability partnership funds.

Autodesk has certain royalty commitments associated with the sale and licensing of certain products. Royalty expense is generally based on a dollar amount per unit sold or a percentage of the underlying revenue. Royalty expense, which was recorded under cost of maintenance and subscription revenue and cost of license and other revenue on Autodesk’s Consolidated Statements of Operations, was $15.3 million in fiscal 2018, $16.2 million in fiscal 2017, and $17.4 million in fiscal 2016.

Guarantees and Indemnifications

In the normal course of business, Autodesk provides indemnifications of varying scopes, including limited product warranties and indemnification of customers against claims of intellectual property infringement made by third parties arising from the use of its products or services. Autodesk accrues for known indemnification issues if a loss is probable and can be reasonably estimated. Historically, costs related to these indemnifications have not been significant, and because potential future costs are highly variable, Autodesk is unable to estimate the maximum potential impact of these indemnifications on its future results of operations.

In connection with the purchase, sale, or license of assets or businesses with third parties, Autodesk has entered into or assumed customary indemnification agreements related to the assets or businesses purchased, sold or licensed. Historically, costs related to these indemnifications have not been significant, and because potential future costs are highly variable, Autodesk is unable to estimate the maximum potential impact of these indemnifications on its future results of operations.

As permitted under Delaware law, Autodesk has agreements whereby it indemnifies its officers and directors for certain events or occurrences while the officer or director is, or was, serving at Autodesk’s request in such capacity. The maximum potential amount of future payments Autodesk could be required to make under these indemnification agreements is unlimited; however, Autodesk has directors’ and officers’ liability insurance coverage that is intended to reduce its financial exposure and may enable Autodesk to recover a portion of any future amounts paid. Autodesk believes the estimated fair value of these indemnification agreements in excess of applicable insurance coverage is minimal.

Legal Proceedings

Autodesk is involved in a variety of claims, suits, investigations, and proceedings in the normal course of business activities including claims of alleged infringement of intellectual property rights, commercial, employment, piracy prosecution, business practices, and other matters. Autodesk routinely reviews the status of each significant matter and assesses its potential financial exposure. If the potential loss from any matter is considered probable and the amount can be reasonably estimated, Autodesk records a liability for the estimated loss. Because of inherent uncertainties related to these legal matters, Autodesk bases its loss accruals on the best information available at the time. As additional information becomes available, Autodesk reassesses its potential liability and may revise its estimates. In the Company's opinion, resolution of pending matters is not expected to have a material adverse impact on its consolidated results of operations, cash flows, or its financial position. Given the unpredictable nature of legal proceedings, there is a reasonable possibility that an unfavorable resolution of one or more such proceedings could in the future materially affect the Company's results of operations, cash flows, or financial position in a particular period, however, based on the information known by the Company as of the date of this filing and the rules and regulations applicable to the preparation of the Company's financial statements, any such amount is either immaterial or it is not possible to provide an estimated amount of any such potential loss.

Stockholders' (Deficit) Equity	12 Months Ended
Stockholders' (Deficit) Equity	Jan. 31, 2018
Equity [Abstract]
Stockholders' (Deficit) Equity	Stockholders' (Deficit) Equity Preferred Stock Under Autodesk’s Certificate of Incorporation, 2.0 million shares of preferred stock are authorized. At January 31, 2018, there were no preferred shares issued or outstanding. The Board of Directors has the authority to issue the preferred stock in one or more series and to fix rights, preferences, privileges, and restrictions, including dividends and the number of shares constituting any series or the designation of such series, without any further vote or action by the stockholders. Common Stock Repurchase Program Autodesk has a stock repurchase program that is used to offset dilution from the issuance of stock under the Company’s employee stock plans and for such other purposes as may be in the interests of Autodesk and its stockholders, which has the effect of returning excess cash generated from the Company’s business to stockholders. Autodesk repurchased and retired approximately 6.9 million shares in fiscal 2018 at an average repurchase price of $100.45 per share, 9.7 million shares in fiscal 2017 at an average repurchase price of $64.73 per share, and 8.5 million shares in fiscal 2016 at an average repurchase price of $53.58. At January 31, 2018, 19.6 million shares remained available for repurchase under the repurchase program approved by the Board of Directors. The share repurchase program does not have an expiration date and the pace and timing of repurchases will depend on factors such as cash generation from operations, available surplus, the volume of employee stock plan activity, cash requirements for acquisitions, economic and market conditions, stock price and legal and regulatory requirements.

Interest and Other Expense, net

12 Months Ended

Jan. 31, 2018

Interest and Other Income, net [Abstract]

Interest and Other Expense, net

Interest and other expense, net, consists of the following:



	Fiscal Year Ended January 31,
	2018			2017			2016
Interest and investment expense, net	$	(34.5	)	$	(29.7	)	$	(33.9	)
Loss on foreign currency	(3.3		)	(3.3		)	—
(Loss) gain on strategic investments	(16.4		)	0.3			3.8
Other income	6.0			8.5			8.5
Interest and other expense, net	$	(48.2	)	$	(24.2	)	$	(21.6	)

Accumulated Other Comprehensive Loss

12 Months Ended

Jan. 31, 2018

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Accumulated Other Comprehensive Loss

Accumulated other comprehensive loss, net of taxes, consisted of the following:



	Net Unrealized Gains (Losses) on Derivative Instruments			Net Unrealized Gains (Losses) on Available for Sale Securities			Defined Benefit Pension Components			Foreign Currency Translation Adjustments			Total
Balances, January 31, 2016	$	15.7		$	0.2		$	(28.3	)	$	(108.7	)	$	(121.1	)
Other comprehensive income (loss) before reclassifications	7.4			3.3			(5.8		)	(52.3		)	(47.4		)
Pre-tax (gains) losses reclassified from accumulated other comprehensive income	(7.4		)	(1.5		)	1.2			—			(7.7		)
Tax effects	(1.1		)	(0.5		)	(0.9		)	0.2			(2.3		)
Net current period other comprehensive (loss) income	(1.1		)	1.3			(5.5		)	(52.1		)	(57.4		)
Balances, January 31, 2017	14.6			1.5			(33.8		)	(160.8		)	(178.5		)
Other comprehensive (loss) income before reclassifications	(24.5		)	(0.6		)	4.3			86.3			65.5
Pre-tax (gains) losses reclassified from accumulated other comprehensive income	(9.9		)	0.3			0.9			0.1			(8.6		)
Tax effects	3.2			0.1			(0.7		)	(4.8		)	(2.2		)
Net current period other comprehensive (loss) income	(31.2		)	(0.2		)	4.5			81.6			54.7
Balances, January 31, 2018	$	(16.6	)	$	1.3		$	(29.3	)	$	(79.2	)	$	(123.8	)

Reclassifications related to gains and losses on available-for-sale securities are included in Interest and other expense, net. Refer to Note 2, "Financial Instruments" for the amount and location of reclassifications related to derivative instruments. Reclassifications of the defined benefit pension components are included in the computation of net periodic benefit cost. Refer to Note 14, "Retirement Benefit Plans."

Net Loss Per Share

12 Months Ended

Jan. 31, 2018

Earnings Per Share [Abstract]

Net Loss Per Share

Basic net loss per share is computed using the weighted average number of shares of common stock outstanding for the period, excluding stock options and restricted stock units. Diluted net loss per share is based upon the weighted average number of shares of common stock outstanding for the period and potentially dilutive common shares, including the effect of stock options and restricted stock units under the treasury stock method. The following table sets forth the computation of the numerators and denominators used in the basic and diluted net loss per share amounts:



	Fiscal Year Ended January 31,
	2018			2017			2016
Numerator:
Net loss	$	(566.9	)	$	(582.1	)	$	(330.5	)
Denominator:
Denominator for basic net loss per share—weighted average shares	219.5			222.7			226.0
Effect of dilutive securities (1)	—			—			—
Denominator for dilutive net loss per share	219.5			222.7			226.0
Basic net loss per share	$	(2.58	)	$	(2.61	)	$	(1.46	)
Diluted net loss per share	$	(2.58	)	$	(2.61	)	$	(1.46	)

____________________


(1)	The effect of dilutive securities of 4.5 million, 4.6 million, and 4.7 million shares for the fiscal year ended January 31, 2018, 2017, and 2016, respectively, have been excluded from the calculation of diluted net loss per share as those shares would have been anti-dilutive due to the net loss incurred during those fiscal years.

The computation of diluted net loss per share does not include shares that are anti-dilutive under the treasury stock method because their exercise prices are higher than the average market value of Autodesk’s stock during the fiscal year. The effect of 0.5 million, 0.1 million, and 0.1 million potentially anti-dilutive shares were excluded from the computation of net loss per share for the fiscal years ended January 31, 2018, 2017, and 2016, respectively.

Segment, Geographic and Product Family Information

12 Months Ended

Jan. 31, 2018

Segment Reporting [Abstract]

Segment, Geographic and Product Family Information

Autodesk reports segment information based on the “management” approach. The management approach designates the internal reporting used by management for making decisions, allocating resources and assessing performance as the source of the Company’s reportable segments. The Company's chief operating decision maker ("CODM") allocates resources and assesses the operating performance of the Company as a whole. As such, Autodesk has one segment manager (the CODM), and one operating segment.

Information regarding Autodesk’s revenue by geographic area and product family is as follows:



	Fiscal Year Ended January 31,
	2018		2017		2016
Net revenue by geographic area (1):
Americas
U.S.	$	740.4	$	742.1	$	803.9
Other Americas	130.7		129.8		168.9
Total Americas	871.1		871.9		972.8
Europe, Middle East, and Africa	815.4		800.4		934.6
Asia Pacific	370.1		358.7		596.7
Total net revenue	$	2,056.6	$	2,031.0	$	2,504.1

Net revenue by product family:
Architecture, Engineering and Construction	$	866.5	$	880.9	$	949.1
Manufacturing	589.2		625.8		724.6
AutoCAD and AutoCAD LT	401.4		326.7		594.8
Media and Entertainment	152.0		138.9		160.0
Other	47.5		58.7		75.6
	$	2,056.6	$	2,031.0	$	2,504.1

__________________


(1)	Revenue by geographic area is based on the bill to country.

Information regarding Autodesk’s long-lived assets by geographic area is as follows:



	January 31,
	2018		2017
Long-lived assets (1):
Americas
U.S.	$	99.3	$	118.8
Other Americas	14.6		5.9
Total Americas	113.9		124.7
Europe, Middle East, and Africa	16.7		18.7
Asia Pacific	14.4		15.2
Total long-lived assets	$	145.0	$	158.6

____________________

(1)

Long-lived assets exclude deferred tax assets, marketable securities, goodwill, and other intangible assets.

Retirement Benefit Plans

12 Months Ended

Jan. 31, 2018

Retirement Benefits [Abstract]

Retirement Benefit Plans

Pretax Savings Plan

Autodesk has a 401(k) plan that covers nearly all U.S. employees. Eligible employees may contribute up to 75% of their pretax salary, subject to limitations mandated by the Internal Revenue Service. Autodesk makes voluntary cash contributions and matches a portion of employee contributions in cash. Autodesk’s contributions were $17.3 million in fiscal 2018, $16.4 million in fiscal 2017, and $17.3 million in fiscal 2016. Autodesk does not allow participants to invest in Autodesk common stock through the 401(k) plan.

Defined Benefit Pension Plans

Autodesk maintains certain defined benefit pension plans to employees primarily located in countries outside of the U.S, particularly the United Kingdom, Switzerland, and Japan. The Company deposits funds for specific plans, consistent with the requirements of local law, with insurance companies, third-party trustees, or into government-managed accounts, and accrues for the unfunded portion of the obligation, where material. Depending on the design of the plan, local customs, and market circumstances, the liabilities of a plan may exceed qualified plan assets.

Benefit Obligation and Plan Assets

The changes in the projected benefit obligations and plan assets for the plans described above were as follows:



	Fiscal year ended January 31,
	2018			2017
Beginning projected benefit obligation	$	146.4		$	145.2
Service cost	5.2			5.6
Interest cost	2.7			3.0
Actuarial (gain) loss	(2.8		)	7.1
Benefits paid	(3.3		)	(2.6		)
Foreign currency exchange rate changes	13.9			(9.5		)
Curtailments and settlements	(8.2		)	(6.8		)
Contributions by plan participants	4.0			4.4
Plan amendment	0.2			—
Ending projected benefit obligation	$	158.1		$	146.4

Beginning fair value of plan assets	$	107.4		$	101.4
Actual return on plan assets	3.8			4.2
Contributions paid by employer	6.5			15.3
Contributions paid by plan participants	4.0			4.4
Benefit payments	(3.3		)	(2.6		)
Curtailments and settlements	(8.0		)	(6.8		)
Foreign currency exchange rate changes	10.7			(8.5		)
Ending fair value of plan assets	$	121.1		$	107.4
Funded status	$	(37.0	)	$	(39.0	)

The amounts recognized on the consolidated balance sheets at the end of each period were as follows:



	Fiscal Year Ended January 31,
	2018		2017
Other long-term liabilities	$	37.0	$	39.0
Accumulated other comprehensive loss, before tax	31.7		37.0
Net amount recognized	$	68.7	$	76.0

On a worldwide basis, the Company's defined benefit pension plans were 77% funded as of January 31, 2018.

As of January 31, 2018, the aggregate accumulated benefit obligation was $139.5 million for the defined benefit pension plans compared to $128.2 million as of January 31, 2017. Included in the aggregate data in the following tables are the amounts applicable to the Company's defined benefit pension plans, with accumulated benefit obligations in excess of plan assets, as well as plans with projected benefit obligations in excess of plan assets. Amounts related to such plans at the end of each period were as follows:



	Fiscal Year Ended January 31,
	2018		2017
Plans with accumulated benefit obligations in excess of plan assets:
Accumulated benefit obligations	$	130.7	$	119.2
Plan assets	112.1		98.3
Plans with projected benefit obligations in excess of plan assets:
Projected benefit obligations	$	158.1	$	146.4
Plan assets	121.1		107.4

Defined Benefit Pension Plan Assets

The investments of the plans are managed by insurance companies or third-party investment managers selected by Autodesk's Trustees, consistent with regulations or market practice of the country where the assets are invested. Investments managed by qualified insurance companies or third-party investment managers under standard contracts follow local regulations, and Autodesk is not actively involved in their investment strategies.

Defined benefit pension plan assets measured at fair value on a recurring basis consisted of the following investment categories at the end of each period as follows:



	Fiscal Year Ended January 31,
	2018								2017
	Level 1		Level 2		Level 3		Total		Total
Insurance contracts	$	—	$	53.0	$	—	$	53.0	$	46.3
Other investments	—		17.0		—		17.0		9.4
Total assets measured at fair value	$	—	$	70.0	$	—	70.0		55.7
Cash							0.2		—
Investment Fund valued using net asset value							50.9		51.7
Total pension plan assets at fair value							$	121.1	$	107.4

The insurance contracts in the preceding table represent the immediate cash surrender value of assets managed by qualified insurance companies. Autodesk does not have control over the target allocation or visibility of the investment strategies of those investments. Insurance contracts and investments held by insurance companies made up 44% and 43% of total plan assets as of January 31, 2018, and January 31, 2017, respectively.

The assets held in the investment fund in the preceding table are invested in a diversified growth fund actively managed by Russell Investments in association with Aon Hewitt. The objective of the fund is to generate capital appreciation on a long-term basis through a diversified portfolio of investments. The fund aims to deliver equity-like returns in the medium to long term with around two-thirds the volatility of equity markets. The fair value of the assets held in the investment fund are priced monthly at net asset value without restrictions on redemption.

Estimated Future Benefit Payments

Estimated benefit payments over the next 10 fiscal years are as follows:



	Pension Benefits
2019	$	7.1
2020	6.5
2021	6.4
2022	6.4
2023	6.4
2024-2028	34.8

Funding Expectations

Our expected required funding for the plans during fiscal 2019 is approximately $4.7 million.

Net Periodic Benefit Cost

The components of net periodic pension cost for the defined benefit pension plans for fiscal 2018, 2017, and 2016 are as follows:



	Fiscal Year Ended January 31,
	2018			2017			2016
Service cost for benefits earned during the period	$	5.2		$	5.6		$	5.7
Interest cost on projected benefit obligation	2.7			3.0			3.3
Expected return on plan assets	(3.9		)	(4.2		)	(3.9		)
Amortization of prior service credit	(0.3		)	(0.3		)	(0.1		)
Amortization of loss	1.2			1.5			1.4
Settlement loss	1.9			1.2			—
Curtailment gain	(0.1		)	—			—
Net periodic benefit cost	$	6.7		$	6.8		$	6.4

Amounts Recorded in OCI

The components of other comprehensive income for the defined benefit pension plans before taxes for fiscal 2018, 2017, and 2016 are as follows:



	Fiscal Year Ended January 31,
	2018			2017			2016
Prior service credit for period	$	0.2		$	—		$	(2.2	)
Net (gain) loss for period	(2.5		)	7.2			9.1
Effect of settlement	(1.9		)	(1.2		)	—
Effect of curtailment	(0.2		)	—			—
Amortization of prior service credit	0.3			0.3			0.1
Amortization of net loss	(1.2		)	(1.5		)	(1.4		)
Other comprehensive (income) loss	$	(5.3	)	$	4.8		$	5.6

Amounts Recorded in Accumulated Other Comprehensive Loss

The amounts recorded in accumulated other comprehensive loss before taxes at the end of each period were as follows:



	Fiscal Year Ended January 31,
	2018			2017
Net prior service credit	$	(3.1	)	$	(3.6	)
Net actuarial loss	34.8			40.6
Accumulated other comprehensive loss, before tax	$	31.7		$	37.0

The estimated amounts that will be amortized from accumulated other comprehensive loss into net periodic benefit cost over the next fiscal year for the qualified defined benefit pension plans are as follows:



	Pension Benefits
Amortization of prior service credit	$	0.2
Amortization of the net loss	(0.6		)
Total amortization	$	(0.4	)

Assumptions

Weighted average actuarial assumptions used to determine costs for the plans for each period were as follows:



	Fiscal Year Ended January 31,
	2018		2017		2016
Discount rate	2.4	%	3.2	%	3.2	%
Expected long-term rate of return on plan assets	3.3	%	4.3	%	3.8	%
Rate of compensation increase	2.3	%	2.2	%	2.2	%

The weighted-average expected long-term rate of return for the plan assets is 3.3%. The weighted-average expected long-term rate of return on plan assets is based on the interest rates guaranteed under the insurance contracts, and the expected rate of return appropriate for each category of assets weighted for the distribution within the diversified investment fund. The assumptions used for the plans are based upon customary rates and practices for the location of the plans. Factors such as asset class allocations, long-term rates of return (actual and expected), and results of periodic asset liability modeling studies are considered when constructing the long-term rate of return assumption for our defined benefit pension plans.

Weighted average actuarial assumptions used to determine benefit obligations for the plans at the end of each period were as follows:



	Fiscal Year Ended January 31,
	2018		2017		2016
Discount rate	1.8	%	1.7	%	2.2	%
Rate of compensation increase	2.6	%	2.6	%	2.6	%

In selecting the appropriate discount rate for the plans, the Company uses country-specific information, adjusted to reflect the duration of the particular plan. The discount rate was based on highly rated long-term bond indexes and yield curves that match the duration of the plan’s benefit obligations.

Defined Contribution Plans

Autodesk also provides defined contribution plans in certain foreign countries where required by statute. Autodesk’s funding policy for foreign defined contribution plans is consistent with the local requirements in each country. Autodesk’s contributions to these plans were $27.2 million in fiscal 2018, $26.6 million in fiscal 2017, and $23.0 million in fiscal 2016.

Other Plans

In addition, Autodesk offers a non-qualified deferred compensation plan to certain key employees whereby they may defer a portion (or all) of their annual compensation until retirement or a different date specified by the employee in accordance with terms of the plan. See Note 6, “Deferred Compensation,” for further discussion.

Restructuring charges and other facility exit costs, net

12 Months Ended

Jan. 31, 2018

Restructuring and Related Activities [Abstract]

Restructuring charges and other facility exit costs, net

During the fourth quarter of fiscal 2018, the Board of Directors approved a world-wide restructuring plan (“Fiscal 2018 Plan”) to support the Company's strategic priorities of completing the subscription transition, digitizing the Company, and re-imagining manufacturing, construction, and production. Through the restructuring, Autodesk seeks to reduce its investments in areas not aligned with its strategic priorities, including in areas related to research and development and go-to-market activities. At the same time, Autodesk plans to further invest in strategic priority areas related to digital infrastructure, customer success, and construction. By re-balancing resources to better align with the Company’s strategic priorities, Autodesk is positioning itself to meet its long-term goals. This world-wide restructuring plan includes a reduction in force that will result in the termination of approximately 13% of the Company’s workforce, or approximately 1,150 employees, and the consolidation of certain leased facilities.

The Company expects to substantially complete the reduction in force and the facilities consolidation by the end of fiscal 2019. The Company anticipates incurring pre-tax restructuring charges of $135 million to $149 million, of which $94 million was incurred during the fourth quarter of fiscal 2018. Substantially all of the charges will result in cash expenditures, $124 million to $137 million of which will be for one-time employee termination benefits, and $11 million to $12 million of which will be for facilities-related and other costs.

Other costs primarily consist of legal, consulting, and other costs related to employee terminations and are expensed when incurred. During fiscal 2018, we incurred $0.4 million in lease termination costs not related to the Fiscal 2018 Plan.

The following tables set forth the restructuring charges and other facility exit costs, net during the fiscal years ended January 31, 2018 and 2017:



	Balances, January 31, 2017		Additions		Payments			Adjustments (1)			Balances, January 31, 2018
Fiscal 2018 Plan
Employee terminations costs	$	—	$	87.3	$	(35.1	)	$	0.8		$	53.0
Facility terminations and other exit costs	—		6.3		(1.3		)	(2.5		)	2.5
Fiscal 2017 Plan
Employee terminations costs	1.1		0.1		(1.5		)	0.3			—
Facility terminations and other exit costs	1.9		0.1		(1.5		)	(0.3		)	0.2
Other Facility Termination Costs
Facility termination costs	4.5		0.3		(3.0		)	(0.3		)	1.5
Total	$	7.5	$	94.1	$	(42.4	)	$	(2.0	)	$	57.2
Current portion (2)	$	5.9									$	57.2
Non-current portion (2)	1.6										—
Total	$	7.5									$	57.2

____________________


(1)	Adjustments primarily relate to the accelerated depreciation of fixed assets and the impact of foreign exchanges rate changes.


(2)	The current and non-current portions of the reserve are recorded in the Consolidated Balance Sheets under “Other accrued liabilities” and “Other liabilities,” respectively.



	Balances, January 31, 2016		Additions		Payments			Adjustments (1)			Balances, January 31, 2017
Fiscal 2017 Plan
Employee terminations costs	—		63.3		(62.2		)	—			1.1
Facility terminations and other exit costs	—		7.1		(3.2		)	(2.0		)	1.9
Other Facility Termination Costs
Facility termination costs	—		7.4		(1.8		)	(1.1		)	4.5
Total	$	—	$	77.8	$	(67.2	)	$	(3.1	)	$	7.5
Current portion (2)	$	—									$	5.9
Non-current portion (2)	—										1.6
Total	$	—									$	7.5

_______________


(1)	Adjustments include the impact of foreign currency translation.

(2)

The current and non-current portions of the reserve are recorded in the Consolidated Balance Sheets under “Other accrued liabilities” and “Other liabilities,” respectively.

Selected Quarterly Financial Information (Unaudited)

12 Months Ended

Jan. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Financial Information (Unaudited)

Summarized quarterly financial information for fiscal 2018 and 2017 is as follows:



2018	1st quarter			2nd quarter			3rd quarter			4th quarter			Fiscal year
Net revenue	$	485.7		$	501.8		$	515.3		$	553.8		$	2,056.6
Gross profit	407.5			427.2			437.8			480.7			1,753.2
Loss from operations	(119.6		)	(107.6		)	(100.0		)	(181.9		)	(509.1		)
Provision for income taxes	(8.2		)	(17.6		)	(8.6		)	24.8			(9.6		)
Net loss	(129.6		)	(144.0		)	(119.8		)	(173.5		)	(566.9		)
Basic net loss per share	$	(0.59	)	$	(0.66	)	$	(0.55	)	$	(0.79	)	$	(2.58	)
Diluted net loss per share	$	(0.59	)	$	(0.66	)	$	(0.55	)	$	(0.79	)	$	(2.58	)
Loss from operations includes the following items:
Stock-based compensation expense	$	59.0		$	58.8		$	65.1		$	62.1		$	245.0
Amortization of acquisition related intangibles	10.4			8.9			8.7			8.6			36.6
CEO transition costs	11.0			10.6			—			(0.2		)	21.4
Restructuring charges and other facility exit costs, net	(0.3		)	0.5			—			93.9			94.1

2017	1st quarter			2nd quarter			3rd quarter			4th quarter			Fiscal year
Net revenue	$	511.9		$	550.7		$	489.6		$	478.8		$	2,031.0
Gross profit	419.5			465.6			408.1			395.9			1,689.1
Loss from operations	(149.7		)	(62.9		)	(119.9		)	(167.1		)	(499.6		)
Provision for income taxes	(14.4		)	(25.2		)	(13.5		)	(5.2		)	(58.3		)
Net loss	(167.7		)	(98.2		)	(142.8		)	(173.4		)	(582.1		)
Basic net loss per share	$	(0.75	)	$	(0.44	)	$	(0.64	)	$	(0.78	)	$	(2.61	)
Diluted net loss per share	$	(0.75	)	$	(0.44	)	$	(0.64	)	$	(0.78	)	$	(2.61	)
Loss from operations includes the following items:
Stock-based compensation expense	$	51.6		$	54.3		$	56.6		$	59.3		$	221.8
Amortization of acquisition related intangibles	18.8			18.5			17.2			17.3			71.8
Restructuring charges, net	52.3			16.0			3.2			9.0			80.5

FINANCIAL STATEMENT SCHEDULE II

12 Months Ended

Jan. 31, 2018

Valuation and Qualifying Accounts [Abstract]

Financial Statement Schedule II

FINANCIAL STATEMENT SCHEDULE II



Description	Balance at Beginning of Fiscal Year		Additions Charged to Costs and Expenses or Revenues			Deductions and Write-Offs		Balance at End of Fiscal Year
	(in millions)
Fiscal Year Ended January 31, 2018
Allowance for doubtful accounts	$	1.5	$	2.1		$	1.3	$	2.3
Partner Program reserves (1)	28.1		224.3			215.9		36.5
Restructuring	8.4		94.1			45.3		57.2
Fiscal Year Ended January 31, 2017
Allowance for doubtful accounts	$	7.6	$	(3.3	)	$	2.8	$	1.5
Partner Program reserves (1)	45.2		240.3			257.4		28.1
Restructuring	1.3		77.8			70.7		8.4
Fiscal Year Ended January 31, 2016
Allowance for doubtful accounts	$	6.3	$	2.3		$	1.0	$	7.6
Partner Program reserves (1)	36.5		267.4			258.7		45.2
Restructuring	1.6		—			0.3		1.3

____________________

(1)

The partner program reserves balance impacts "Accounts receivable, net" and "Accounts payable" on the accompanying Consolidated Balance Sheets.

Business and Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Jan. 31, 2018
Accounting Policies [Abstract]
Business	Business Autodesk, Inc. (“Autodesk” or the “Company”) is a world leading design software and services company, offering customers productive business solutions through powerful technology products and services. The Company serves customers in the architecture, engineering, and construction; manufacturing; and digital media, consumer, and entertainment industries. The Company’s sophisticated software products, offered through a hybrid of desktop and cloud functionality, enable its customers to experience their ideas before they are real by allowing them to imagine, design, and create their ideas and to visualize, simulate, and analyze real-world performance early in the design process by creating digital prototypes. These capabilities allow Autodesk’s customers to foster innovation, optimize and improve their designs, help save time and money, improve quality, and collaborate with others. Autodesk software products are sold globally, both directly to customers and through a network of resellers and distributors.
Principles of Consolidation	Principles of Consolidation The accompanying consolidated financial statements include the accounts of Autodesk and its wholly-owned subsidiaries. All intercompany accounts and transactions have been eliminated.
Change in Presentation	Change in Presentation During the first quarter of fiscal 2018, the Company changed its historical presentation of its revenue and cost of revenue categories. Previously, the Company presented revenue and cost of revenue on two lines: subscription, and license and other. Included within subscription was maintenance revenue for all of the Company's software products and revenue for the Company's cloud service offerings. License and other revenue included product license revenue, standalone consulting services, and other immaterial items. Also, included within license and other revenue was an allocation of the estimated value of the software license from the Company's term-based product subscriptions and enterprise offerings, which contain a software license, maintenance and cloud services. For these arrangements, as there is no vendor-specific-objective evidence ("VSOE") for the related maintenance, the arrangement consideration was allocated between the license and maintenance deliverables based on best estimated selling prices in our consolidated statements of operations. The Company performed the allocation because it provided a meaningful presentation to investors based on the Company's then current product mix. As part of the Company's technological and business model transition, the Company discontinued the sale of most of its perpetual licenses, transitioning away from selling a mix of perpetual licenses and term-based product subscriptions to a single subscription model involving a combined hybrid offering of desktop software and cloud functionality, which provides a device-independent, collaborative design workflow for designers and their stakeholders. Fiscal 2018 marks the first full year in the Company's history that it sold substantially all term-based product subscriptions. To better reflect this shift in its business, the Company adopted a revised presentation in the first quarter of fiscal 2018, including the separation of subscription revenue and maintenance revenue on distinct line items on the Company's consolidated statement of operations. Subscription revenue now consists of our term-based product subscriptions, cloud service offerings, and flexible enterprise business arrangements. Note that with the change in presentation of revenue in the Company’s consolidated statement of operations in fiscal 2018, term-based product subscriptions and flexible enterprise business arrangements are classified and presented in a single line item. Maintenance revenue is presented as a separate line item in the new presentation and consists of revenue from the Company's existing maintenance plan agreements and related renewals. License and other revenue will continue to be presented as a separate line item and include any residual perpetual licenses sold, standalone consulting services, and other immaterial items. In connection with these revisions, the Company also revised its cost of revenue classification to present cost of subscription and maintenance revenue and amortization of developed technology separately. Cost of license and other revenue will continue to be presented as a separate line item. This change in presentation does not affect the Company's total net revenues, total cost of net revenues or overall gross margin.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with U.S. generally accepted accounting principles ("GAAP") requires management to make estimates and assumptions that affect the amounts reported in Autodesk’s consolidated financial statements and notes thereto. These estimates are based on information available as of the date of the consolidated financial statements. On a regular basis, management evaluates these estimates and assumptions. Actual results may differ materially from these estimates. Examples of significant estimates and assumptions made by management involve the determination of the fair value of acquired assets and liabilities, goodwill, financial instruments including strategic investments, long-lived assets and other intangible assets, the realizability of deferred tax assets, and the fair value of stock awards. The Company also makes assumptions, judgments, and estimates in determining the accruals for uncertain tax positions, provisional estimates associated with the December 22, 2017 enactment of the U.S. Tax Cuts and Jobs Act ("Tax Act"), variable compensation, partner incentive programs, product returns reserves, allowances for doubtful accounts, asset retirement obligations, and legal contingencies.
Foreign Currency Translation and Transactions	Foreign Currency Translation and Transactions The assets and liabilities of Autodesk’s foreign subsidiaries are translated from their respective functional currencies into U.S. dollars at the rates in effect at the balance sheet date, and revenue and expense amounts are translated at exchange rates that approximate those rates in effect during the period in which the underlying transactions occur. Foreign currency translation adjustments are recorded as other comprehensive (loss) income. Gains and losses realized from foreign currency transactions, those transactions denominated in currencies other than the foreign subsidiary’s functional currency, are included in interest and other income, net. Monetary assets and liabilities are remeasured using foreign currency exchange rates at the end of the period, and non-monetary assets are remeasured based on historical exchange rates.
Derivative Financial Instruments	Derivative Financial Instruments Autodesk accounts for its derivative instruments as either assets or liabilities on the balance sheet and carries them at fair value. Gains and losses resulting from changes in fair value are accounted for depending on the use of the derivative and whether it is designated and qualifies for hedge accounting. Derivatives that do not qualify for hedge accounting are adjusted to fair value through earnings.
Cash and Cash Equivalents	Cash and Cash Equivalents Autodesk considers all highly liquid investments with insignificant interest rate risk and remaining maturities of three months or less at the date of purchase to be cash equivalents. Cash equivalents are recorded at cost, which approximates fair value.
Marketable Securities and Privately Held Company Investments	Marketable Securities and Privately Held Company Investments Marketable securities are stated at fair value. Marketable securities maturing within one year that are not restricted are classified as current assets. Substantially all marketable debt and equity investments held by Autodesk are classified as current based on the nature of the investments and their availability for use in current operations. Autodesk determines the appropriate classification of its marketable securities at the time of purchase and re-evaluates such classification as of each balance sheet date. Autodesk carries all “available-for-sale securities” at fair value, with unrealized gains and losses, net of tax, reported in stockholders’ equity (deficit) until disposition or maturity. Autodesk carries all “trading securities” at fair value, with unrealized gains and losses, recorded in “Interest and other income, net” in the Company’s Consolidated Statements of Operations. The cost of securities sold is based on the specific-identification method. Autodesk regularly invests in non-marketable debt and equity securities of privately held companies. The carrying values of such investments are included in other long-term assets. For the majority of our privately held company investments, we use the cost method of accounting. All of Autodesk’s marketable securities and privately held company investments are subject to a periodic impairment review. The Company recognizes an impairment charge when a decline in the fair value of its investments below the cost basis is judged to be other-than-temporary. Autodesk considers various factors in determining whether to recognize an impairment charge, including the length of time and extent to which the fair value has been less than Autodesk’s cost basis, the financial condition and near-term prospects of the investee, and Autodesk’s intent and ability to hold the investment for a period of time sufficient to allow for any anticipated recovery in the market value.
Accounts Receivable, Net	Allowances for uncollectible trade receivables are based upon historical loss patterns, the number of days that billings are past due, and an evaluation of the potential risk of loss associated with problem accounts. As part of the indirect channel model, Autodesk has a partner incentive program that uses quarterly attainment of monetary rewards to motivate distributors and resellers to achieve mutually agreed upon business goals in a specified time period. A portion of these incentives reduce license and other revenue in the current period. The remainder, which relates to incentives on our Subscription Program, is recorded as a reduction to deferred revenue in the period the subscription transaction is billed and subsequently recognized as a reduction to subscription revenue over the contract period. These incentive balance s do not require significant assumptions or judgments. Depending on how the payments are made, the reserves associated with the partner incentive program are treated on the balance sheet as either contra account receivable or accounts payable.
Concentration of Credit Risk	Concentration of Credit Risk Autodesk places its cash, cash equivalents, and marketable securities in highly liquid instruments with, and in the custody of, multiple diversified financial institutions globally with high credit ratings and limits the amounts invested with any one institution, type of security, and issuer. Autodesk’s primary commercial banking relationship is with Citigroup Inc. and its global affiliates. Citibank, N.A., an affiliate of Citigroup, is one of the lead lenders and an agent in the syndicate of Autodesk’s $400.0 million line of credit facility. It is Autodesk’s policy to limit the amounts invested with any one institution by type of security and issuer. The bank counterparties to the derivative contracts potentially expose Autodesk to credit-related losses in the event of their nonperformance. However, to mitigate that risk, Autodesk only contracts with counterparties who meet the Company's minimum requirements under its counterparty risk assessment process. Autodesk monitors counterparty risk on at least a quarterly basis and will adjust its exposure to various counterparties as necessary. Autodesk generally enters into master netting arrangements, which reduce credit risk by permitting net settlement of transactions with the same counterparty. However, Autodesk does not have any master netting arrangements in place with collateral features. Autodesk’s accounts receivable are derived from sales to a large number of resellers, distributors, and direct customers in the Americas; EMEA; and APAC geographies. Autodesk performs ongoing evaluations of these partners' financial condition and limits the amount of credit extended when deemed necessary, but generally does not require collateral from such parties.
Computer Equipment, Software, Furniture and Leasehold Improvements, Net	Costs incurred for computer software developed or obtained for internal use are capitalized for application development activities, if material, and immediately expensed for preliminary project activities and post-implementation activities. These capitalized costs are amortized over the software’s expected useful life, which is generally three years.Computer Equipment, Software, Furniture, and Leasehold Improvements, Net Computer equipment, software, and furniture are depreciated using the straight-line method over the estimated useful lives of the assets, which range from three to five years. Leasehold improvements are amortized on a straight-line basis over the shorter of their estimated useful lives or the lease term.
Software Development Costs	Software Development Costs Software development costs incurred prior to the establishment of technological feasibility are included in research and development expenses. Autodesk defines establishment of technological feasibility as the completion of a working model. Software development costs incurred subsequent to the establishment of technological feasibility through the period of general market availability of the products are capitalized and generally amortized over a three-year period, if material.
Other Intangible Assets, Net	Other Intangible Assets, Net Other intangible assets include developed technologies, customer relationships, trade names, patents, user lists and the related accumulated amortization. These assets are shown as “Developed technologies, net” and as part of “Other assets” in the Consolidated Balance Sheet. The majority of Autodesk’s other intangible assets are amortized to expense over the estimated economic life of the product, which ranges from two to ten years.
Goodwill	Goodwill Goodwill consists of the excess of the consideration transferred over the fair value of net assets acquired in business combinations. Autodesk tests goodwill for impairment annually in its fourth fiscal quarter or more often if circumstances indicate a potential impairment may exist, or if events have affected the composition of reporting units. When goodwill is assessed for impairment, Autodesk has the option to perform an assessment of qualitative factors of impairment (“optional assessment”) prior to necessitating a quantitative impairment test. Should the optional assessment be used for any given fiscal year, qualitative factors to consider include cost factors; financial performance; legal, regulatory, contractual, political, business, or other factors; entity specific factors; industry and market considerations, macroeconomic conditions, and other relevant events and factors affecting the reporting unit. If, after assessing the totality of events or circumstances, it is more likely than not that the fair value of the reporting unit is greater than its carrying value, then performing the quantitative impairment test is unnecessary. The quantitative impairment test is necessary when either Autodesk does not use the optional assessment or, as a result of the optional assessment, it is not more likely than not that the fair value of the reporting unit is greater than its carrying value. As described in the "Accounting Standards Adopted" section of Note 1, Autodesk early adopted ASU 2017-04, which simplifies the subsequent measurement of goodwill to eliminate Step 2 from the goodwill impairment test, removing the need to determine the implied fair value of goodwill and comparing it to the carrying amount of that goodwill to measure the impairment loss, if any. In situations in which an entity's reporting unit is publicly traded, the fair value of the Company may be approximated by its market capitalization, in performing the quantitative impairment test. Goodwill impairment exists when the estimated fair value of goodwill is less than its carrying value. If impairment exists, the carrying value of the goodwill is reduced to fair value through an impairment charge recorded in the Company's statements of operations. The process of evaluating the potential impairment of goodwill is subjective and requires significant judgment at many points during the analysis. The value of Autodesk’s goodwill could also be impacted by future adverse changes such as: (i) declines in Autodesk’s actual financial results, (ii) a sustained decline in Autodesk’s market capitalization, (iii) a significant slowdown in the worldwide economy or the industries Autodesk serves, or (iv) changes in Autodesk’s business strategy. For the annual impairment test, Autodesk's market capitalization was substantially in excess of the carrying value of the Company as of January 31, 2018. Accordingly, Autodesk has determined there was no goodwill impairment during the year ended January 31, 2018. In addition, Autodesk did not recognize any goodwill impairment losses in fiscal 2017 or 2016.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets At least annually or more frequently as circumstances dictate, Autodesk reviews its long-lived assets for impairment whenever impairment indicators exist. Autodesk continually monitors events and changes in circumstances that could indicate the carrying amounts of its long-lived assets may not be recoverable. When such events or changes in circumstances occur, Autodesk assesses recoverability of these assets. Recoverability is measured by comparison of the carrying amounts of the assets to the future undiscounted cash flow the assets are expected to generate. If the long-lived assets are considered to be impaired, the impairment to be recognized is equal to the amount by which the carrying value of the assets exceeds its fair market value. Autodesk did not recognize any material impairments of long-lived assets during the fiscal years ended January 31, 2018, 2017, and 2016, respectively. In addition to the recoverability assessments, Autodesk routinely reviews the remaining estimated useful lives of its long-lived assets. Any reduction in the useful life assumption will result in increased depreciation and amortization expense in the quarter when such determinations are made, as well as in subsequent quarters.
Deferred Tax Assets	Deferred Tax Assets Deferred tax assets arise primarily from tax credits, net operating losses, and timing differences for reserves, accrued liabilities, stock options, deferred revenue, purchased technologies, and capitalized intangibles, partially offset by U.S. deferred tax liabilities on acquired intangibles, and valuation allowances against U.S. and foreign deferred tax assets. Autodesk performed a quarterly assessment of the recoverability of these net deferred tax assets and believe it will generate sufficient future taxable income in appropriate tax jurisdictions to realize the net deferred tax assets. They are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to reverse. Valuation allowances are established when necessary to reduce gross deferred tax assets to the amount that is "more likely than not" to be realized.
Revenue Recognition	Revenue Recognition Autodesk recognizes revenue when persuasive evidence of an arrangement exists, delivery has occurred or services have been rendered, the price is fixed or determinable, and collection is probable. For multiple element arrangements containing only software and software-related elements, Autodesk allocates the sales price among each of the deliverables using the residual method, under which a portion of the total arrangement consideration is allocated to undelivered elements based on their vendor-specific objective evidence (“VSOE”) of fair value and the remainder or residual of the total consideration is recognized as revenue for the delivered elements. VSOE is the price charged when an element is sold separately or a price set by management with the relevant authority. If Autodesk does not have VSOE of an undelivered element, revenue recognition is deferred on the entire sales arrangement until all elements for which Autodesk does not have VSOE are delivered. If Autodesk does not have VSOE for undelivered product subscriptions, maintenance or services, the total consideration for the arrangement is recognized ratably over the longest contractual service period in the arrangement. For multiple element arrangements involving non-software elements, including cloud subscription services, our revenue recognition policy is based upon the accounting guidance contained in ASC 605, Revenue Recognition. For these arrangements, Autodesk first allocates the total arrangement consideration based on the relative selling prices of the software group of elements as a whole and to the non-software elements. Autodesk then further allocates consideration within the software group to the respective elements within that group using the residual method as described above. Autodesk exercises judgment and uses estimates in connection with the determination of the amount of revenue to be recognized in each accounting period. Autodesk allocates the total arrangement consideration among the various elements based on a selling price hierarchy. The selling price for a deliverable is based on its VSOE if available, third-party evidence ("TPE") if VSOE is not available, or the best estimated selling price ("BESP") if neither VSOE nor TPE is available. BESP represents the price at which Autodesk would transact for the deliverable if it were sold regularly on a standalone basis. To establish BESP for those elements for which neither VSOE nor TPE are available, Autodesk performs a quantitative analysis of pricing data points for historical standalone transactions involving such elements for a twelve-month period. As part of this analysis, Autodesk monitors and evaluates the BESP against actual pricing to ensure that it continues to represent a reasonable estimate of the standalone selling price, considering several other external and internal factors including, but not limited to, pricing and discounting practices, contractually stated prices, the geographies in which Autodesk offers products and services, and the type of customer (i.e. distributor, value-added reseller, and direct end user, among others). Autodesk analyzes BESP at least annually or on a more frequent basis if a significant change in our business necessitates a more timely analysis, or if significant selling price variances are experienced. In situations when Autodesk has multiple contracts with a single counterparty, Autodesk uses the guidance in ASC 985-605 to evaluate both the form and the substance of the arrangements to determine if they should be combined and accounted for as one arrangement or as separate arrangements. Autodesk’s assessment of the likelihood of collection is also a critical factor in determining the timing of revenue recognition. If Autodesk does not believe that collection is probable, the revenue will be deferred until payment is received. Autodesk's maintenance revenue consists of renewal fees for existing maintenance plan agreements that were initially purchased with a perpetual software license. Under the maintenance plan, customers are eligible to receive unspecified upgrades, when and if available, and technical support. Autodesk recognizes maintenance revenue ratably over the term of the maintenance agreement, which is generally between one and three years. Autodesk's subscription revenue consists of term-based product subscriptions, cloud service offerings, and flexible enterprise business arrangements. With Autodesk's subscription plan, customers can use Autodesk software anytime, anywhere, and get access to the latest updates to previous versions. Revenue from these arrangements is recognized ratably over the contract term. Revenue for Autodesk's cloud service offerings is recognized ratably over the contract term, commencing with the date Autodesk's service is made available to customers and when all other revenue recognition criteria have been satisfied. License and other revenue consists of two components: license revenue and other revenue. License revenue includes software license revenue from the sale of perpetual licenses. Other revenue includes revenue such as standalone consulting and training, and is recognized over time as the services are performed.
Taxes Collected from Customers	Taxes Collected from Customers Autodesk nets taxes collected from customers against those remitted to government authorities in the consolidated financial statements. Accordingly, taxes collected from customers are not reported as revenue.
Shipping and Handling Cost	Shipping and Handling Costs Shipping and handling costs are included in cost of revenue for all periods presented.
Stock-Based Compensation Expense	Autodesk estimates expected volatility for stock-based awards based on the average of the following two measures: (1) a measure of historical volatility in the trading market for the Company’s common stock, and (2) the implied volatility of traded forward call options to purchase shares of the Company’s common stock. The expected volatility for performance stock units subject to market conditions includes the expected volatility of Autodesk's peer companies within the S&P Computer Software Select Index or S&P North American Technology Software Index with a market capitalization over $2.00 billion, depending on the award type. Autodesk estimates the expected life of stock-based awards using both exercise behavior and post-vesting termination behavior as well as consideration of outstanding options. The range of expected lives of ESPP awards are based upon the four, six-month exercise periods within a 24-month offering period. Autodesk did not pay cash dividends in fiscal 2018, 2017, or 2016 and does not anticipate paying any cash dividends in the foreseeable future. Consequently, an expected dividend yield of zero is used in the BSM option pricing model and the Monte Carlo simulation model. The risk-free interest rate used in the BSM option pricing model and the Monte Carlo simulation model for stock-based awards is the historical yield on U.S. Treasury securities with equivalent remaining lives. Autodesk recognizes expense only for the stock-based awards that ultimately vest. Autodesk accounts for forfeitures of stock-based awards as those forfeitures occur.Autodesk determines the grant date fair value of its share-based payment awards using a Black-Scholes Merton ("BSM") option pricing model or the quoted stock price on the date of grant, unless the awards are subject to market conditions, in which case Autodesk uses a binomial-lattice model (e.g., Monte Carlo simulation model). The Monte Carlo simulation model utilizes multiple input variables to estimate the probability that market conditions will be achieved.
Advertising Expenses	Advertising Expenses Advertising costs are expensed as incurred.
Net (Loss) Income Per Share	Net (Loss) Income Per Share Basic net (loss) income per share is computed based on the weighted average number of shares of common stock outstanding for the period, excluding stock options and restricted stock. Diluted net (loss) income per share is computed based upon the weighted average shares of common shares outstanding for the period and potentially dilutive common shares, including the effect of stock options and restricted stock units under the treasury stock method.
Defined Benefit Pension Plans	Defined Benefit Pension Plans The funded status of Autodesk's defined benefit pension plans is recognized in the Consolidated Balance Sheets. The funded status is measured as the difference between the fair value of plan assets and the projected benefit obligation for the fiscal years presented. The projected benefit obligation represents the actuarial present value of benefits expected to be paid upon retirement based on employee services already rendered and estimated future compensation levels. The fair value of plan assets represents the current market value of Autodesk's cumulative company and participant contributions made to the various plans in effect. Net periodic benefit cost is recorded in the Consolidated Statements of Operations and includes service cost, interest cost, expected return on plan assets, amortization of prior service costs, and gains or losses previously recognized as a component of other comprehensive loss. Certain events, such as changes in the employee base, plan amendments, and changes in actuarial assumptions may result in a change in the defined benefit obligation and the corresponding change to other comprehensive income. Gains and losses and prior service costs not recognized as a component of net periodic benefit cost in the Consolidated Statements of Operations as they arise are recognized as a component of other comprehensive (loss) income in the Consolidated Statements of Comprehensive (Loss) Income. Those gains and losses and prior service costs are subsequently amortized as a component of net periodic benefit cost over the average remaining service lives of the plan participants using a corridor approach to determine the portion of gain or loss subject to amortization. The measurement of projected benefit obligations and net periodic benefit cost is based on estimates and assumptions that reflect the terms of the plans and use participant-specific information such as compensation, age and years of services, as well as certain assumptions, including estimates of discount rates, expected return of plan assets, rate of compensation increases, interest rates, and mortality rates.
Accounting Standards	Accounting Standards in Fiscal 2018 With the exception of those discussed below, there have been no recent changes in accounting pronouncements issued by FASB or adopted by the Company during the fiscal year ended January 31, 2018, that are of significance, or potential significance, to the Company. Accounting Standards Adopted Autodesk adopted FASB's Accounting Standards Update No. 2017-04 ("ASU 2017-04"), "Intangibles-Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment" during the three months ended April 30, 2017. The ASU simplifies the accounting for goodwill impairment by removing Step 2 of the goodwill impairment test. Under current guidance, Step 2 of the goodwill impairment test requires entities to calculate the implied fair value of goodwill in the same manner as the amount of goodwill recognized in a business combination by assigning the fair value of a reporting unit to all of the assets and liabilities of the reporting unit. The carrying value in excess of the implied fair value is recognized as goodwill impairment. Under the new standard, goodwill impairment is recognized based on Step 1 of the current guidance, which calculates the carrying value in excess of the reporting unit’s fair value. The new guidance is required to be applied on a prospective basis and as such, Autodesk used the simplified test in its annual fourth fiscal quarter testing. ASU 2017-04 did not have a material impact on Autodesk's consolidated financial statements. Recently Issued Accounting Standards But Not Yet Adopted In February 2018, the FASB issued Accounting Standards Update No. 2018-02 (“ASU 2018-02”), “Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.” The amendment allows entities to reclassify stranded tax effects resulting from the Tax Cuts and Jobs Act from accumulated other comprehensive income to retained earnings. The amendment only impacts the income tax effect of the passage of the Tax Cuts and Jobs Act but does not affect the underlying guidance that requires that the effect of a change in tax laws or rates be included in income from continuing operations. The amendment is effective for Autodesk fiscal year beginning February 1, 2019, with early adoption permitted. Autodesk is currently evaluating the accounting, transition, and disclosure requirements of the standard and cannot currently estimate the financial statement impact of adoption. In August 2017, FASB issued Accounting Standards Update No. 2017-12 ("ASU 2017-12"), "Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities." The targeted amendments help simplify certain aspects of hedge accounting and result in a more accurate portrayal of the economics of an entity’s risk management activities in its financial statements. For cash flow and net investment hedges as of the adoption date, the guidance requires a modified retrospective approach. The amended presentation and disclosure guidance is required only prospectively. The amendments are effective for Autodesk's fiscal year beginning February 1, 2019, with early adoption permitted. Autodesk is currently evaluating the accounting, transition, and disclosure requirements of the standard and cannot currently estimate the financial statement impact of adoption. In February 2017, FASB issued Accounting Standards Update No. 2017-05 ("ASU 2017-05"), "Other Income– Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets." The ASU, among other things, clarifies the scope of the derecognition of nonfinancial assets, the definition of in substance financial assets, and impacts the accounting for partial sales of nonfinancial assets by requiring full gain recognition upon the sale. The amendments are effective for Autodesk's fiscal year beginning February 1, 2018. The guidance may be applied retrospectively for all periods presented or retrospectively with a cumulative-effect adjustment at the date of adoption. The effect of the implementation will depend upon the nature of the Company's future acquisitions or dispositions, if any. The adoption of the guidance would not have had a material impact on acquisitions prior to the current period and on the Company's consolidated statements of financial condition and results of operations. In January 2017, FASB issued Accounting Standards Update No. 2017-01 ("ASU 2017-01"), "Business Combinations: Clarifying the Definition of a Business" which provides a more robust framework to use in determining when a set of assets and activities is considered a business. The amendments will be effective for Autodesk's fiscal year beginning February 1, 2018. The new guidance is required to be applied on a prospective basis. The effect of the implementation will depend upon the nature of the Company's future acquisitions, if any. In October 2016, FASB issued Accounting Standards Update No. 2016-16 ("ASU 2016-16"), “Income Taxes: Intra-Entity Transfers of Assets Other than Inventory” which requires that entities recognize the income tax consequences of an intra-entity transfer of an asset, other than inventory, when the transfer occurs. The amendments will be effective for Autodesk's fiscal year beginning February 1, 2018. The new guidance is required to be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. Autodesk does not believe the ASU will have a material impact on its consolidated financial statements. In June 2016, FASB issued Accounting Standards Update No. 2016-13 ("ASU 2016-13") regarding ASC Topic 326, "Financial Instruments - Credit Losses," which modifies the measurement of expected credit losses of certain financial instruments. Autodesk plans to adopt ASU 2016-13 as of the effective date which represents Autodesk’s fiscal year beginning February 1, 2020. Autodesk does not believe the ASU will have a material impact on its consolidated financial statements. In February 2016, FASB issued Accounting Standards Update No. 2016-02 ("ASU 2016-02") regarding ASC Topic 842, "Leases." The amendments in this ASU require balance sheet recognition of lease assets and lease liabilities by lessees for leases classified as operating leases, with an optional policy election to not recognize lease assets and lease liabilities for leases with a term of 12 months or less. The amendments also require new disclosures, including qualitative and quantitative requirements, providing additional information about the amounts recorded in the financial statements. Autodesk plans to adopt ASU 2016-02 in Autodesk’s fiscal year beginning February 1, 2019. The amendments require a modified retrospective approach with optional practical expedients. Autodesk is currently evaluating the accounting, transition, and disclosure requirements of the standard and cannot currently estimate the financial statement impact of adoption. In January 2016, FASB issued Accounting Standards Update No. 2016-01 ("ASU 2016-01") regarding ASC Topic 825-10, "Financial Instruments - Overall." The amendments address certain aspects of recognition, measurement, presentation, and disclosure of financial instruments, and require equity securities to be measured at fair value, unless the measurement alternative method has been elected, with changes in fair value recognized through net income. The amendments also simplify the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment for impairment quarterly at each reporting period. The amendments in ASU 2016-01 will be effective for Autodesk's fiscal year beginning February 1, 2018. An entity should apply the amendments by means of a cumulative-effect adjustment to the balance sheet as of the beginning of the fiscal year of adoption, with prospective adoption of the amendments related to equity securities without readily determinable fair values existing as of the date of adoption. Autodesk does not believe ASU 2016-01 will have a material impact on its consolidated financial statements. In May 2014, FASB issued Accounting Standards Update No. 2014-09, “Revenue from Contracts with Customers (ASC Topic 606),” which supersedes the revenue recognition requirements in "Revenue Recognition (ASC Topic 605)." ASU 2014-09 provides principles for recognizing revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. In August 2015, FASB issued Accounting Standards Update No. 2015-14 to defer the effective date by one year with early adoption permitted as of the original effective date. In addition, FASB issued Accounting Standards Update No. 2016-08, Accounting Standards Update No. 2016-10, Accounting Standards Update No. 2016-12, and Accounting Standard Update No. 2016-20 in March 2016, April 2016, May 2016, and December 2016, respectively, to help provide interpretive clarifications on the new guidance in ASC Topic 606. Autodesk will adopt ASU 2014-09 as of February 1, 2018, using the modified retrospective transition method. The Company's implementation efforts are substantially complete. The Company has concluded that the desktop software and related cloud services that are included in the majority of its product subscription offerings and enterprise arrangements are not distinct in the context of the contract as they are considered highly interrelated and represent a single combined performance obligation that should be recognized over time. Therefore, the new standard will not result in a material change in the timing and amount of the recognition of revenue for the majority of the Company's product subscription offerings and enterprise arrangements. One impact of the new standard relates to product subscriptions that do not incorporate substantial cloud services. A limited number of Autodesk's product subscriptions do not incorporate substantial cloud services, and under ASU 2014-09, will be recognized as distinct license and service performance obligations. Currently, under ASC Topic 605, licenses sold with undelivered elements without VSOE are recognized ratably over the term of the undelivered elements. Under ASC Topic 606, Autodesk is no longer required to establish VSOE to recognize software license revenue separately from the other elements and will recognize software licenses once the customer obtains control of the license, which is generally upon delivery of the license. Therefore, revenue allocated to the licenses in these offerings under Topic 606 will be recognized at a point in time instead of over the contract term. While the Company is still evaluating, Autodesk believes the impact of the change to the timing of revenue recognition is expected to have a balance sheet pre-tax impact at the date of adoption of approximately $80 - $100 million reduction to the deferred revenue balance. Another significant provision under ASU 2014-09 includes the capitalization and amortization of costs associated with obtaining a contract, most significantly sales commissions. The amortization period for the Company's deferred costs will be recognized over the estimated period of benefit. The Company expects there to be a balance sheet pre-tax impact at the date of adoption recognizing the deferred sales commission capitalization costs of approximately $102 - $112 million.

Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Jan. 31, 2018

Accounting Policies [Abstract]

Schedule of Error Corrections and Prior Period Adjustments

The following table shows reclassified amounts to conform to the periods' presentation:



	Fiscal Year Ended January 31, 2017							Fiscal Year Ended January 31, 2016
	Previously Reported		Change in Presentation Reclassification			Current Presentation		Previously Reported		Change in Presentation Reclassification			Current Presentation
Net revenue:
Maintenance (1)	N/A		$	1,103.1		$	1,103.1	N/A		$	1,152.5		$	1,152.5
Subscription	$	1,290.0	(846.9		)	443.1		$	1,277.2	(1,049.1		)	228.1
License and other	741.0		(256.2		)	484.8		1,226.9		(103.4		)	1,123.5
Total	$	2,031.0	$	—		$	2,031.0	$	2,504.1	$	—		$	2,504.1

Cost of revenue:
Maintenance and subscription (2)	$	151.3	$	40.4		$	191.7	$	156.1	$	6.2		$	162.3
License and other	190.6		(80.4		)	110.2		214.6		(55.2		)	159.4
Amortization of developed technology (1)	N/A		40.0			40.0		N/A		49.0			49.0
Total	$	341.9	$	—		$	341.9	$	370.7	$	—		$	370.7

_______________

(1) These lines were not previously reported in the Consolidated Statement of Operations.

(2) Previously, titled "Subscription."

Schedule of Accounts, Notes, Loans and Financing Receivable

Accounts receivable, net, consisted of the following as of January 31:



	2018			2017
Trade accounts receivable	$	469.2		$	477.5
Less: Allowance for doubtful accounts	(2.3		)	(1.5		)
Product returns reserve	(0.2		)	(0.2		)
Partner programs and other obligations	(28.5		)	(23.5		)
Accounts receivable, net	$	438.2		$	452.3

Property, Plant and Equipment

Computer equipment, software, furniture, leasehold improvements and the related accumulated depreciation at January 31 were as follows:



	2018			2017
Computer hardware, at cost	$	217.1		$	206.1
Computer software, at cost	72.6			73.5
Leasehold improvements, land and buildings, at cost	228.9			206.3
Furniture and equipment, at cost	63.4			58.2
Computer software, hardware, leasehold improvements, furniture, and equipment, at cost	582.0			544.1
Less: Accumulated depreciation	(437.0		)	(385.5		)
Computer software, hardware, leasehold improvements, furniture, and equipment, net	$	145.0		$	158.6

Schedule of Finite-Lived Intangible Assets by Major Class

Other intangible assets and related accumulated amortization at January 31 were as follows:



	2018			2017
Developed technologies, at cost	$	578.5		$	583.6
Customer relationships, trade names, patents, and user lists, at cost (1)	372.5			375.9
Other intangible assets, at cost (2)	951.0			959.5
Less: Accumulated amortization	(895.8		)	(862.0		)
Other intangible assets, net	$	55.2		$	97.5

_______________


(1)	Included in “Other assets” in the accompanying Consolidated Balance Sheets.

(2)

Includes the effects of foreign currency translation.

Schedule of Expected Amortization Expense

Excluding in-process research and development, expected future amortization expense for developed technologies, customer relationships, trade names, patents, and user lists for each of the fiscal years ended thereafter is as follows:



	Fiscal Year ended January 31,
2019	$	28.0
2020	16.1
2021	7.7
2022	3.4
Thereafter	—
Total	$	55.2

Schedule of Goodwill

The following table summarizes the changes in the carrying amount of goodwill during the fiscal years ended January 31, 2018 and 2017:



	January 31, 2018			January 31, 2017
Goodwill, beginning of the year	$	1,710.3		$	1,684.2
Less: accumulated impairment losses, beginning of the year	(149.2		)	(149.2		)
Additions arising from acquisitions during the year	—			62.8
Effect of foreign currency translation, measurement period adjustments, and other (1)	59.1			(36.7		)
Goodwill, end of the year	$	1,620.2		$	1,561.1

_______________


(1)	Purchase accounting adjustments reflect revisions made to the Company’s preliminary purchase price allocations during fiscal 2018 and 2017.

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

The following table summarizes stock-based compensation expense for fiscal 2018, 2017, and 2016, respectively, as follows:



	Fiscal Year Ended January 31,
	2018			2017			2016
Cost of maintenance and subscription revenue	$	11.9		$	8.6		$	5.8
Cost of license and other revenue	4.0			5.5			6.0
Marketing and sales	107.3			94.1			85.2
Research and development	82.9			81.3			70.4
General and administrative	55.3			32.3			29.8
Stock-based compensation expense related to stock awards and Employee Qualified Stock Purchase Plan ("ESPP") purchases	261.4			221.8			197.2
Tax benefit	(2.6		)	(2.6		)	(1.6		)
Stock-based compensation expense related to stock awards and ESPP purchases, net	$	258.8		$	219.2		$	195.6

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award

Autodesk uses the following assumptions to estimate the fair value of stock-based awards:



	Fiscal Year Ended		Fiscal Year Ended		Fiscal Year Ended
	January 31, 2018		January 31, 2017		January 31, 2016
	Performance Stock Unit	ESPP	Performance Stock Unit	ESPP	Performance Stock Unit	ESPP
Range of expected volatilities	32%	31% - 34%	38 - 39%	30 - 40%	27%	28 -29%
Range of expected lives (in years)	N/A	0.5 - 2.0	N/A	0.5 - 2.0	N/A	0.5 - 2.0
Expected dividends	—%	—%	—%	—%	—%	—%
Range of risk-free interest rates	1.0% - 1.2%	0.9% - 1.4%	0.6 - 0.7%	0.5 - 0.9%	0.2%	0.1 - 0.7%

Financial Instruments (Tables)

12 Months Ended

Jan. 31, 2018

Investments, All Other Investments [Abstract]

Cost and Fair Value of Financial Instruments Disclosure



			January 31, 2018
			Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value			Level 1		Level 2			Level 3
Cash equivalents (1):
	Agency bonds		$	5.0	$	—	$	—		$	5.0		$	5.0	$	—		$	—
	Certificates of deposit		17.4		—		—			17.4			17.4		—			—
	Commercial paper		324.2		—		—			324.2			—		324.2			—
	Corporate debt securities		5.0		—		—			5.0			5.0		—			—
	Custody cash deposit		5.2		—		—			5.2			5.2		—			—
	Money market funds		278.8		—		—			278.8			—		278.8			—
	Municipal bonds		5.0		—		—			5.0			5.0		—			—
	Sovereign debt		2.0		—		—			2.0			—		2.0			—
Marketable securities:
	Short-term available-for-sale
		Asset backed securities	13.1		—		—			13.1			—		13.1			—
		Commercial paper	27.5		—		—			27.5			—		27.5			—
		Corporate debt securities	99.4		—		(0.1		)	99.3			99.3		—			—
		Other (2)	9.2		—		—			9.2			7.7		1.5			—
		U.S. government securities	37.1		—		—			37.1			37.1		—			—
	Short-term trading securities
		Mutual funds	50.1		8.9		—			59.0			59.0		—			—
	Long-term available-for-sale
		Agency bonds	13.7		—		(0.1		)	13.6			13.6		—			—
		Asset backed securities	36.8		—		(0.2		)	36.6			—		36.6			—
		Corporate debt securities	100.2		0.1		(0.4		)	99.9			99.9		—			—
		Municipal bonds	12.7		—		(0.1		)	12.6			12.6		—			—
		Sovereign debt	2.8		—		—			2.8			—		2.8			—
		U.S. government securities	25.5		—		(0.2		)	25.3			25.3		—			—
Convertible debt securities (3)			7.5		0.5		(0.2		)	7.8			—		—			7.8
Derivative contract assets (4)			2.0		7.5		(1.3		)	8.2			—		7.2			1.0
Derivative contract liabilities (5)			—		—		(26.6		)	(26.6		)	—		(26.6		)	—
		Total	$	1,080.2	$	17.0	$	(29.2	)	$	1,068.0		$	392.1	$	667.1		$	8.8

____________________


(1)	Included in “Cash and cash equivalents” in the accompanying Consolidated Balance Sheets.


(2)	Consists of agency bonds, certificates of deposit, sovereign debt, and municipal bonds.


(3)	Considered “available for sale” and included in “Other assets” in the accompanying Consolidated Balance Sheets.


(4)	Included in “Prepaid expenses and other current assets,” “Other assets,” or “Other accrued liabilities” in the accompanying Consolidated Balance Sheets.


(5)	Included in “Other accrued liabilities” in the accompanying Consolidated Balance Sheets.



			January 31, 2017
			Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value			Level 1		Level 2			Level 3
Cash equivalents (1):
	Agency bonds		$	6.0	$	—	$	—		$	6.0		$	6.0	$	—		$	—
	Certificates of deposit		63.1		—		—			63.1			63.1		—			—
	Commercial paper		207.4		—		—			207.4			—		207.4			—
	Corporate debt securities		40.2		—		—			40.2			40.2		—			—
	Custody cash deposit		3.2		—		—			3.2			3.2		—			—
	Money market funds		256.5		—		—			256.5			—		256.5			—
	Municipal bonds		5.0		—		—			5.0			5.0		—			—
	Sovereign debt		15.0		—		—			15.0			—		15.0			—
	U.S. government securities		309.5		—		—			309.5			309.5		—			—
Marketable securities:
	Short-term available-for-sale
		Agency bonds	13.2		—					13.2			13.2		—			—
		Asset backed securities	19.6		—		—			19.6			—		19.6			—
		Certificates of deposit	157.3		—		—			157.3			157.3		—			—
		Commercial paper	109.2		—		—			109.2			—		109.2			—
		Corporate debt securities	234.7		—		(0.2		)	234.5			234.5		—			—
		Municipal bonds	43.4		—		—			43.4			43.4		—			—
		Sovereign debt	30.0		—		—			30.0			—		30.0			—
		U.S. government securities	32.3		—		—			32.3			32.3		—			—
	Short-term trading securities
		Mutual funds	44.8		2.5		—			47.3			47.3		—			—
	Long-term available-for-sale
		Agency bonds	7.1		—		—			7.1			7.1		—			—
		Asset backed securities	65.8		0.1		—			65.9			—		65.9			—
		Corporate debt securities	172.1		0.1		(0.1		)	172.1			172.1		—			—
		Municipal bonds	10.7		—		—			10.7			10.7		—			—
		Sovereign debt	1.5		—		—			1.5			—		1.5			—
		U.S. government securities	48.8		0.1		—			48.9			48.9		—			—
Convertible debt securities (2)			4.9		2.3		(1.6		)	5.6			—		—			5.6
Derivative contract assets (3)			2.2		12.3		(1.3		)	13.2			—		11.9			1.3
Derivative contract liabilities (4)			—		—		(10.4		)	(10.4		)	—		(10.4		)	—
		Total	$	1,903.5	$	17.4	$	(13.6	)	$	1,907.3		$	1,193.8	$	706.6		$	6.9

____________________


(1)	Included in “Cash and cash equivalents” in the accompanying Consolidated Balance Sheets.


(2)	Considered "available for sale" securities and included in "Other assets" in the accompanying Consolidated Balance Sheets.


(3)	Included in “Prepaid expenses and other current assets,” "Other assets," or “Other accrued liabilities” in the accompanying Consolidated Balance Sheets.

(4)

Included in “Other accrued liabilities” in the accompanying Consolidated Balance Sheets.

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation

A reconciliation of the change in Autodesk’s Level 3 items for the fiscal year ended January 31, 2018 was as follows:



	Fair Value Measurements Using Significant Unobservable Inputs
	(Level 3)
		Derivative Contracts			Convertible Debt Securities			Total
Balances, January 31, 2017		$	1.3		$	5.6		$	6.9
Purchases		1.1			5.9			7.0
Gains (losses) included in earnings (1)		(1.4		)	(3.2		)	(4.6		)
Gains included in OCI		—			(0.5		)	(0.5		)
Balances, January 31, 2018		$	1.0		$	7.8		$	8.8

____________________


(1)	Included in “Interest and other expense, net” in the accompanying Consolidated Statement of Operations.

Available-for-sale Securities

The following table summarizes the estimated fair value of Autodesk's “available-for-sale securities” classified by the contractual maturity date of the security:



	January 31, 2018
	Cost		Fair Value
Due within in 1 year	$	193.8	$	194.0
Due in 1 year through 5 years	186.9		186.0
Due in 5 years through 10 years	3.7		3.7
Due after 10 years	1.1		1.1
Total	$	385.5	$	384.8

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value

The fair value of derivative instruments in Autodesk’s Consolidated Balance Sheets were as follows as of January 31, 2018, and January 31, 2017:



	Balance Sheet Location	Fair Value at
	Balance Sheet Location	January 31, 2018		January 31, 2017
Derivative Assets
Foreign currency contracts designated as cash flow hedges	Prepaid expenses and other current assets	$	6.2	$	10.1
Derivatives not designated as hedging instruments	Prepaid expenses and other current assets and Other assets	2.0		3.2
Total derivative assets		$	8.2	$	13.3
Derivative Liabilities
Foreign currency contracts designated as cash flow hedges	Other accrued liabilities	$	18.7	$	4.5
Derivatives not designated as hedging instruments	Other accrued liabilities	7.9		6.0
Total derivative liabilities		$	26.6	$	10.5

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance



	Foreign Currency Contracts
	Fiscal Year Ended January 31,
	2018			2017			2016
Amount of (loss) gain recognized in accumulated other comprehensive loss on derivatives (effective portion)	$	(21.3	)	$	6.3		$	2.2
Amount and location of gain (loss) reclassified from accumulated other comprehensive loss into (loss) income (effective portion)
Net revenue	$	8.0		$	9.2		$	39.8
Operating expenses	1.9			(1.8		)	(10.5		)
Total	$	9.9		$	7.4		$	29.3
Amount and location of loss recognized in (loss) income on derivatives (ineffective portion and amount excluded from effectiveness testing)
Interest and other expense, net	$	(0.2	)	$	(0.3	)	$	(0.7	)



	Fiscal Year Ended January 31,
	2018			2017			2016
Amount and location of loss recognized in loss (income) on derivatives
Interest and other expense, net	$	(19.1	)	$	(11.1	)	$	(1.7	)

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References + Details

Employee and Director Stock Plans (Tables)

12 Months Ended

Jan. 31, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Schedule of Share-based Compensation, Stock Options, Activity

A summary of stock option activity for the fiscal year ended January 31, 2018 is as follows:



	Number of Shares (in millions)		Weighted average exercise price per share		Weighted average remaining contractual term (in years)	Aggregate Intrinsic Value (1) (in millions)
Options outstanding at January 31, 2017	0.6		$	39.25
Exercised	(0.4	)	38.66
Options vested, exercisable and outstanding at January 31, 2018	0.2		$	40.49	2.87	$	16.4
Shares available for grant at January 31, 2018	22.2

_______________


(1)	Represents the total pre-tax intrinsic value, based on Autodesk’s closing stock price of $115.62 per share as of January 31, 2018, which would have been received by the option holders had all option holders exercised their options as of that date.

Intrinsic Value of Options Exercised and Weighted Average Grant Date Fair Value of Stock Options Granted

The following table summarizes information about the pre-tax intrinsic value of options exercised during the fiscal years ended January 31, 2018, 2017, and 2016:



	Fiscal year ended January 31,
	2018		2017		2016
Pre-tax intrinsic value of options exercised (1)	$	22.8	$	32.0	$	32.6

——————

(1)

The intrinsic value of options exercised is calculated as the difference between the exercise price of the option and the market value of the stock on the date of exercise.

Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range

The following table summarizes information about options vested and exercisable, and outstanding at January 31, 2018:



	Number of Shares (in thousands)	Weighted average exercise price per share
Range of per-share exercise prices:
$28.56 - $36.44	32.6	$	34.23
$38.55 - $38.55	1.8	38.55
$41.62 - $41.62	184.4	41.62
	218.8	$	40.49

Restricted Share Activity Disclosure

A summary of restricted stock activity for the fiscal year ended January 31, 2018 is as follows:



	Unreleased Restricted Stock Units (in thousands)		Weighted average grant date fair value per share
Unvested restricted stock at January 31, 2017	7,622.4		$	60.13
Granted	2,481.8		106.55
Vested	(3,765.7	)	57.85
Canceled/Forfeited	(692.5	)	69.08
Performance Adjustment (1)	24.7		61.79
Unvested restricted stock at January 31, 2018	5,670.7		$	82.94

_______________

(1)

Based on Autodesk's financial results and relative total stockholder return for the fiscal 2017 performance period. The performance stock units were attained at rates ranging from 99.7% to 114.7% of the target award.

Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity

A summary of the ESPP activity for the years ended January 31, 2018, 2017 and 2016 is as follows:



	Fiscal Year Ended January 31,
	2018		2017		2016
Issued shares	2.0		2.3		2.1
Average price of issued shares	$	39.03	$	36.99	$	36.29
Weighted average grant date fair value of awards granted under the ESPP	$	32.41	$	19.20	$	11.85

Employee and Director Stock Options Outstanding



	(a)	(b)		(c)
Plan category	Number of securities to be issued upon exercise of outstanding options (in millions)	Weighted-average exercise price of outstanding options		Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column (a)) (in millions)
Equity compensation plans approved by security holders	5.9	$	40.49	31.3	(1)
Total	5.9	$	40.49	31.3

____________________


(1)	Included in this amount are 9.1 million securities available for future issuance under Autodesk’s ESPP.

Income Taxes (Tables)

12 Months Ended

Jan. 31, 2018

Income Tax Disclosure [Abstract]

Provision for income taxes

The provision for income taxes consists of the following:



	Fiscal year ended January 31,
	2018			2017			2016
Federal:
Current	$	(0.8	)	$	1.6		$	(4.7	)
Deferred	(19.3		)	8.4			220.9
State:
Current	(0.3		)	(1.9		)	0.5
Deferred	2.2			1.3			20.9
Foreign:
Current	50.9			93.9			68.4
Deferred	(23.1		)	(45.0		)	4.2
	$	9.6		$	58.3		$	310.2

Differences between the U.S. statutory rate and the aggregate income tax provision

The differences between the U.S. statutory rate and the aggregate income tax provision are as follows:



	Fiscal year ended January 31,
	2018			2017			2016
Income tax provision (benefit) at U.S. Federal statutory rate	$	(188.4	)	$	(177.0	)	$	(7.1	)
State income tax benefit, net of the U.S. Federal benefit	(21.9		)	(17.3		)	(7.6		)
Foreign income taxed at rates different from the U.S. statutory rate	(53.3		)	22.3			(29.4		)
U.S. valuation allowance	(82.5		)	233.0			345.0
Transition tax	408.4			—			—
Increase in attributes due to ASU 2016-9 adoption				(119.4		)	—
Change in valuation allowance from ASU 2016-9 adoption	—			119.4			—
Tax effect of non-deductible stock-based compensation	20.7			18.8			19.3
Stock compensation windfall / shortfall	(67.7		)	(23.0		)	—
Research and development tax credit benefit	(11.3		)	(10.3		)	(9.4		)
Closure of income tax audits and changes in uncertain tax positions	1.2			8.2			(4.7		)
Tax effect of officer compensation in excess of $1.0 million	2.2			2.2			1.4
Non-deductible expenses	2.1			2.0			2.6
Other	0.1			(0.6		)	0.1
	$	9.6		$	58.3		$	310.2

Components of Deferred Tax Assets and Liabilities

Significant components of Autodesk’s deferred tax assets and liabilities are as follows:



	January 31,
	2018			2017
Stock-based compensation	$	26.7		$	37.6
Research and development tax credit carryforwards	170.3			136.7
Foreign tax credit carryforwards	162.2			127.3
Accrued compensation and benefits	25.9			39.5
Other accruals not currently deductible for tax	22.9			18.7
Purchased technology and capitalized software	43.4			76.9
Fixed assets	16.5			24.3
Tax loss carryforwards	85.7			173.6
Deferred revenue	120.3			128.3
Other	32.4			27.6
Total deferred tax assets	706.3			790.5
Less: valuation allowance	(634.2		)	(748.0		)
Net deferred tax assets	72.1			42.5
Indefinite lived intangibles	(57.0		)	(70.1		)
Total deferred tax liabilities	(57.0		)	(70.1		)
Net deferred tax assets	$	15.1		$	(27.6	)

Unrecognized Tax Benefits Reconciliation, Table

A reconciliation of the beginning and ending amount of the gross unrecognized tax benefits is as follows:



	Fiscal Year Ended January 31,
	2018			2017			2016
Gross unrecognized tax benefits at the beginning of the fiscal year	$	261.4		$	254.3		$	245.8
Increases for tax positions of prior years	22.8			11.9			1.4
Decreases for tax positions of prior years	(22.5		)	(4.1		)	(7.0		)
Increases for tax positions related to the current year	78.4			11.1			15.8
Decreases relating to settlements with taxing authorities	(0.8		)	(10.8		)	(0.5		)
Reductions as a result of lapse of the statute of limitations	(1.7		)	(1.0		)	(1.2		)
Gross unrecognized tax benefits at the end of the fiscal year	$	337.6		$	261.4		$	254.3

Acquisitions (Tables)

12 Months Ended

Jan. 31, 2018

Business Combinations [Abstract]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed



Developed technologies	$	18.8
Customer relationships	10.2
Trade name	3.8
Goodwill	62.8
Deferred revenue (current and non-current)	(2.1		)
Deferred tax liability	(7.1		)
Net tangible (liabilities) assets	0.6
Total	$	87.0

Commitments and Contingencies (Tables)

12 Months Ended

Jan. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Aggregate Future Minimum Lease Payments

At January 31, 2018, the aggregate future minimum lease payments required were as follows:




2019	$	62.2
2020	46.3
2021	34.1
2022	24.7
2023	22.8
Thereafter	57.7
	247.8
Less: Sublease income	0.8
	$	247.0

Rent expense related to these operating leases recognized on a straight-line basis over the lease period, was as follows:



	Fiscal Year Ended January 31,
	2018		2017		2016
Rent expense	$	55.9	$	65.3	$	58.7

Interest and Other Expense, net (Tables)

12 Months Ended

Jan. 31, 2018

Interest and Other Income, net [Abstract]

Interest and Other Income, net

Interest and other expense, net, consists of the following:



	Fiscal Year Ended January 31,
	2018			2017			2016
Interest and investment expense, net	$	(34.5	)	$	(29.7	)	$	(33.9	)
Loss on foreign currency	(3.3		)	(3.3		)	—
(Loss) gain on strategic investments	(16.4		)	0.3			3.8
Other income	6.0			8.5			8.5
Interest and other expense, net	$	(48.2	)	$	(24.2	)	$	(21.6	)

Accumulated Other Comprehensive Loss (Tables)

12 Months Ended

Jan. 31, 2018

Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]

Schedule of Accumulated Other Comprehensive (Loss) Income

Accumulated other comprehensive loss, net of taxes, consisted of the following:



	Net Unrealized Gains (Losses) on Derivative Instruments			Net Unrealized Gains (Losses) on Available for Sale Securities			Defined Benefit Pension Components			Foreign Currency Translation Adjustments			Total
Balances, January 31, 2016	$	15.7		$	0.2		$	(28.3	)	$	(108.7	)	$	(121.1	)
Other comprehensive income (loss) before reclassifications	7.4			3.3			(5.8		)	(52.3		)	(47.4		)
Pre-tax (gains) losses reclassified from accumulated other comprehensive income	(7.4		)	(1.5		)	1.2			—			(7.7		)
Tax effects	(1.1		)	(0.5		)	(0.9		)	0.2			(2.3		)
Net current period other comprehensive (loss) income	(1.1		)	1.3			(5.5		)	(52.1		)	(57.4		)
Balances, January 31, 2017	14.6			1.5			(33.8		)	(160.8		)	(178.5		)
Other comprehensive (loss) income before reclassifications	(24.5		)	(0.6		)	4.3			86.3			65.5
Pre-tax (gains) losses reclassified from accumulated other comprehensive income	(9.9		)	0.3			0.9			0.1			(8.6		)
Tax effects	3.2			0.1			(0.7		)	(4.8		)	(2.2		)
Net current period other comprehensive (loss) income	(31.2		)	(0.2		)	4.5			81.6			54.7
Balances, January 31, 2018	$	(16.6	)	$	1.3		$	(29.3	)	$	(79.2	)	$	(123.8	)

Net Loss Per Share (Tables)

12 Months Ended

Jan. 31, 2018

Earnings Per Share [Abstract]

Schedule of Calculation of Numerator and Denominator in Earnings Per Share

The following table sets forth the computation of the numerators and denominators used in the basic and diluted net loss per share amounts:



	Fiscal Year Ended January 31,
	2018			2017			2016
Numerator:
Net loss	$	(566.9	)	$	(582.1	)	$	(330.5	)
Denominator:
Denominator for basic net loss per share—weighted average shares	219.5			222.7			226.0
Effect of dilutive securities (1)	—			—			—
Denominator for dilutive net loss per share	219.5			222.7			226.0
Basic net loss per share	$	(2.58	)	$	(2.61	)	$	(1.46	)
Diluted net loss per share	$	(2.58	)	$	(2.61	)	$	(1.46	)

____________________

(1)

The effect of dilutive securities of 4.5 million, 4.6 million, and 4.7 million shares for the fiscal year ended January 31, 2018, 2017, and 2016, respectively, have been excluded from the calculation of diluted net loss per share as those shares would have been anti-dilutive due to the net loss incurred during those fiscal years.

Segment, Geographic and Product Family Information (Tables)

12 Months Ended

Jan. 31, 2018

Segment Reporting [Abstract]

Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area

Information regarding Autodesk’s revenue by geographic area and product family is as follows:



	Fiscal Year Ended January 31,
	2018		2017		2016
Net revenue by geographic area (1):
Americas
U.S.	$	740.4	$	742.1	$	803.9
Other Americas	130.7		129.8		168.9
Total Americas	871.1		871.9		972.8
Europe, Middle East, and Africa	815.4		800.4		934.6
Asia Pacific	370.1		358.7		596.7
Total net revenue	$	2,056.6	$	2,031.0	$	2,504.1

Net revenue by product family:
Architecture, Engineering and Construction	$	866.5	$	880.9	$	949.1
Manufacturing	589.2		625.8		724.6
AutoCAD and AutoCAD LT	401.4		326.7		594.8
Media and Entertainment	152.0		138.9		160.0
Other	47.5		58.7		75.6
	$	2,056.6	$	2,031.0	$	2,504.1

__________________


(1)	Revenue by geographic area is based on the bill to country.

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas

Information regarding Autodesk’s long-lived assets by geographic area is as follows:



	January 31,
	2018		2017
Long-lived assets (1):
Americas
U.S.	$	99.3	$	118.8
Other Americas	14.6		5.9
Total Americas	113.9		124.7
Europe, Middle East, and Africa	16.7		18.7
Asia Pacific	14.4		15.2
Total long-lived assets	$	145.0	$	158.6

____________________


(1)	Long-lived assets exclude deferred tax assets, marketable securities, goodwill, and other intangible assets.

Retirement Benefit Plans (Tables)

12 Months Ended

Jan. 31, 2018

Retirement Benefits [Abstract]

Schedule of Changes in Projected Benefit Obligations

The changes in the projected benefit obligations and plan assets for the plans described above were as follows:



	Fiscal year ended January 31,
	2018			2017
Beginning projected benefit obligation	$	146.4		$	145.2
Service cost	5.2			5.6
Interest cost	2.7			3.0
Actuarial (gain) loss	(2.8		)	7.1
Benefits paid	(3.3		)	(2.6		)
Foreign currency exchange rate changes	13.9			(9.5		)
Curtailments and settlements	(8.2		)	(6.8		)
Contributions by plan participants	4.0			4.4
Plan amendment	0.2			—
Ending projected benefit obligation	$	158.1		$	146.4

Beginning fair value of plan assets	$	107.4		$	101.4
Actual return on plan assets	3.8			4.2
Contributions paid by employer	6.5			15.3
Contributions paid by plan participants	4.0			4.4
Benefit payments	(3.3		)	(2.6		)
Curtailments and settlements	(8.0		)	(6.8		)
Foreign currency exchange rate changes	10.7			(8.5		)
Ending fair value of plan assets	$	121.1		$	107.4
Funded status	$	(37.0	)	$	(39.0	)

Schedule of Amounts Recognized in Balance Sheet

The amounts recognized on the consolidated balance sheets at the end of each period were as follows:



	Fiscal Year Ended January 31,
	2018		2017
Other long-term liabilities	$	37.0	$	39.0
Accumulated other comprehensive loss, before tax	31.7		37.0
Net amount recognized	$	68.7	$	76.0

Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets

Included in the aggregate data in the following tables are the amounts applicable to the Company's defined benefit pension plans, with accumulated benefit obligations in excess of plan assets, as well as plans with projected benefit obligations in excess of plan assets. Amounts related to such plans at the end of each period were as follows:



	Fiscal Year Ended January 31,
	2018		2017
Plans with accumulated benefit obligations in excess of plan assets:
Accumulated benefit obligations	$	130.7	$	119.2
Plan assets	112.1		98.3
Plans with projected benefit obligations in excess of plan assets:
Projected benefit obligations	$	158.1	$	146.4
Plan assets	121.1		107.4

Schedule of Allocation of Plan Assets

Defined benefit pension plan assets measured at fair value on a recurring basis consisted of the following investment categories at the end of each period as follows:



	Fiscal Year Ended January 31,
	2018								2017
	Level 1		Level 2		Level 3		Total		Total
Insurance contracts	$	—	$	53.0	$	—	$	53.0	$	46.3
Other investments	—		17.0		—		17.0		9.4
Total assets measured at fair value	$	—	$	70.0	$	—	70.0		55.7
Cash							0.2		—
Investment Fund valued using net asset value							50.9		51.7
Total pension plan assets at fair value							$	121.1	$	107.4

Schedule of Expected Benefit Payments

Estimated benefit payments over the next 10 fiscal years are as follows:



	Pension Benefits
2019	$	7.1
2020	6.5
2021	6.4
2022	6.4
2023	6.4
2024-2028	34.8

Schedule of Net Benefit Costs

The components of net periodic pension cost for the defined benefit pension plans for fiscal 2018, 2017, and 2016 are as follows:



	Fiscal Year Ended January 31,
	2018			2017			2016
Service cost for benefits earned during the period	$	5.2		$	5.6		$	5.7
Interest cost on projected benefit obligation	2.7			3.0			3.3
Expected return on plan assets	(3.9		)	(4.2		)	(3.9		)
Amortization of prior service credit	(0.3		)	(0.3		)	(0.1		)
Amortization of loss	1.2			1.5			1.4
Settlement loss	1.9			1.2			—
Curtailment gain	(0.1		)	—			—
Net periodic benefit cost	$	6.7		$	6.8		$	6.4

Schedule of Amounts Recognized in Other Comprehensive Income (Loss)

The components of other comprehensive income for the defined benefit pension plans before taxes for fiscal 2018, 2017, and 2016 are as follows:



	Fiscal Year Ended January 31,
	2018			2017			2016
Prior service credit for period	$	0.2		$	—		$	(2.2	)
Net (gain) loss for period	(2.5		)	7.2			9.1
Effect of settlement	(1.9		)	(1.2		)	—
Effect of curtailment	(0.2		)	—			—
Amortization of prior service credit	0.3			0.3			0.1
Amortization of net loss	(1.2		)	(1.5		)	(1.4		)
Other comprehensive (income) loss	$	(5.3	)	$	4.8		$	5.6

Schedule of Net Periodic Benefit Cost Not yet Recognized

The amounts recorded in accumulated other comprehensive loss before taxes at the end of each period were as follows:



	Fiscal Year Ended January 31,
	2018			2017
Net prior service credit	$	(3.1	)	$	(3.6	)
Net actuarial loss	34.8			40.6
Accumulated other comprehensive loss, before tax	$	31.7		$	37.0

Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year



	Pension Benefits
Amortization of prior service credit	$	0.2
Amortization of the net loss	(0.6		)
Total amortization	$	(0.4	)

Schedule of Assumptions Used

Weighted average actuarial assumptions used to determine benefit obligations for the plans at the end of each period were as follows:



	Fiscal Year Ended January 31,
	2018		2017		2016
Discount rate	1.8	%	1.7	%	2.2	%
Rate of compensation increase	2.6	%	2.6	%	2.6	%

Weighted average actuarial assumptions used to determine costs for the plans for each period were as follows:



	Fiscal Year Ended January 31,
	2018		2017		2016
Discount rate	2.4	%	3.2	%	3.2	%
Expected long-term rate of return on plan assets	3.3	%	4.3	%	3.8	%
Rate of compensation increase	2.3	%	2.2	%	2.2	%

Restructuring charges and other facility exit costs, net (Tables)

12 Months Ended

Jan. 31, 2018

Restructuring and Related Activities [Abstract]

Schedule of Restructuring Reserve by Type of Cost

The following tables set forth the restructuring charges and other facility exit costs, net during the fiscal years ended January 31, 2018 and 2017:



	Balances, January 31, 2017		Additions		Payments			Adjustments (1)			Balances, January 31, 2018
Fiscal 2018 Plan
Employee terminations costs	$	—	$	87.3	$	(35.1	)	$	0.8		$	53.0
Facility terminations and other exit costs	—		6.3		(1.3		)	(2.5		)	2.5
Fiscal 2017 Plan
Employee terminations costs	1.1		0.1		(1.5		)	0.3			—
Facility terminations and other exit costs	1.9		0.1		(1.5		)	(0.3		)	0.2
Other Facility Termination Costs
Facility termination costs	4.5		0.3		(3.0		)	(0.3		)	1.5
Total	$	7.5	$	94.1	$	(42.4	)	$	(2.0	)	$	57.2
Current portion (2)	$	5.9									$	57.2
Non-current portion (2)	1.6										—
Total	$	7.5									$	57.2

____________________


(1)	Adjustments primarily relate to the accelerated depreciation of fixed assets and the impact of foreign exchanges rate changes.


(2)	The current and non-current portions of the reserve are recorded in the Consolidated Balance Sheets under “Other accrued liabilities” and “Other liabilities,” respectively.



	Balances, January 31, 2016		Additions		Payments			Adjustments (1)			Balances, January 31, 2017
Fiscal 2017 Plan
Employee terminations costs	—		63.3		(62.2		)	—			1.1
Facility terminations and other exit costs	—		7.1		(3.2		)	(2.0		)	1.9
Other Facility Termination Costs
Facility termination costs	—		7.4		(1.8		)	(1.1		)	4.5
Total	$	—	$	77.8	$	(67.2	)	$	(3.1	)	$	7.5
Current portion (2)	$	—									$	5.9
Non-current portion (2)	—										1.6
Total	$	—									$	7.5

_______________


(1)	Adjustments include the impact of foreign currency translation.

(2)

The current and non-current portions of the reserve are recorded in the Consolidated Balance Sheets under “Other accrued liabilities” and “Other liabilities,” respectively.

Selected Quarterly Financial Information (Unaudited) (Tables)

12 Months Ended

Jan. 31, 2018

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information

Summarized quarterly financial information for fiscal 2018 and 2017 is as follows:



2018	1st quarter			2nd quarter			3rd quarter			4th quarter			Fiscal year
Net revenue	$	485.7		$	501.8		$	515.3		$	553.8		$	2,056.6
Gross profit	407.5			427.2			437.8			480.7			1,753.2
Loss from operations	(119.6		)	(107.6		)	(100.0		)	(181.9		)	(509.1		)
Provision for income taxes	(8.2		)	(17.6		)	(8.6		)	24.8			(9.6		)
Net loss	(129.6		)	(144.0		)	(119.8		)	(173.5		)	(566.9		)
Basic net loss per share	$	(0.59	)	$	(0.66	)	$	(0.55	)	$	(0.79	)	$	(2.58	)
Diluted net loss per share	$	(0.59	)	$	(0.66	)	$	(0.55	)	$	(0.79	)	$	(2.58	)
Loss from operations includes the following items:
Stock-based compensation expense	$	59.0		$	58.8		$	65.1		$	62.1		$	245.0
Amortization of acquisition related intangibles	10.4			8.9			8.7			8.6			36.6
CEO transition costs	11.0			10.6			—			(0.2		)	21.4
Restructuring charges and other facility exit costs, net	(0.3		)	0.5			—			93.9			94.1

2017	1st quarter			2nd quarter			3rd quarter			4th quarter			Fiscal year
Net revenue	$	511.9		$	550.7		$	489.6		$	478.8		$	2,031.0
Gross profit	419.5			465.6			408.1			395.9			1,689.1
Loss from operations	(149.7		)	(62.9		)	(119.9		)	(167.1		)	(499.6		)
Provision for income taxes	(14.4		)	(25.2		)	(13.5		)	(5.2		)	(58.3		)
Net loss	(167.7		)	(98.2		)	(142.8		)	(173.4		)	(582.1		)
Basic net loss per share	$	(0.75	)	$	(0.44	)	$	(0.64	)	$	(0.78	)	$	(2.61	)
Diluted net loss per share	$	(0.75	)	$	(0.44	)	$	(0.64	)	$	(0.78	)	$	(2.61	)
Loss from operations includes the following items:
Stock-based compensation expense	$	51.6		$	54.3		$	56.6		$	59.3		$	221.8
Amortization of acquisition related intangibles	18.8			18.5			17.2			17.3			71.8
Restructuring charges, net	52.3			16.0			3.2			9.0			80.5

Business and Summary of Significant Accounting Policies - Change in Presentation (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Maintenance									$ 989.6	$ 1,103.1	$ 1,152.5
Subscription									894.3	443.1	228.1
License and other									172.7	484.8	1,123.5
Total net revenue	$ 553.8	$ 515.3	$ 501.8	$ 485.7	$ 478.8	$ 489.6	$ 550.7	$ 511.9	2,056.6	2,031.0	2,504.1
Maintenance and subscription									214.4	191.7	162.3
License and other									72.6	110.2	159.4
Amortization of developed technology									16.4	40.0	49.0
Total cost of revenue									$ 303.4	341.9	370.7
Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Subscription										1,290.0	1,277.2
License and other										741.0	1,226.9
Total net revenue										2,031.0	2,504.1
Maintenance and subscription										151.3	156.1
License and other										190.6	214.6
Total cost of revenue										341.9	370.7
Change in Presentation Reclassification
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Maintenance										1,103.1	1,152.5
Subscription										(846.9)	(1,049.1)
License and other										(256.2)	(103.4)
Total net revenue										0.0	0.0
Maintenance and subscription										40.4	6.2
License and other										(80.4)	(55.2)
Amortization of developed technology										40.0	49.0
Total cost of revenue										$ 0.0	$ 0.0

Business and Summary of Significant Accounting Policies - Accounts Receivable, Net (Details) - USD ($) $ in Millions	Jan. 31, 2018	Jan. 31, 2017
Accounting Policies [Abstract]
Trade accounts receivable	$ 469.2	$ 477.5
Less: Allowance for doubtful accounts	(2.3)	(1.5)
Product returns reserve	(0.2)	(0.2)
Partner programs and other obligations	(28.5)	(23.5)
Accounts receivable, net	$ 438.2	$ 452.3

Business and Summary of Significant Accounting Policies - Concentration of Credit Risk (Details) - USD ($)	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Accounting Policies [Abstract]
Maximum borrowing capacity	$ 400,000,000.0
Tech Data \| Sales Revenue, Net
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk, percentage	31.00%	30.00%	25.00%
Tech Data \| Accounts Receivable
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Concentration risk, percentage	31.00%	20.00%

Business and Summary of Significant Accounting Policies - Computer Equipment, Software, Furniture and Leasehold Improvements, Net (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Property, Plant and Equipment [Abstract]
Depreciation	$ 67.6	$ 73.1	$ 60.6
Computer hardware, at cost	217.1	206.1
Computer software, at cost	72.6	73.5
Leasehold improvements, land and buildings, at cost	228.9	206.3
Furniture and equipment, at cost	63.4	58.2
Computer software, hardware, leasehold improvements, furniture, and equipment, at cost	582.0	544.1
Less: Accumulated depreciation	(437.0)	(385.5)
Computer software, hardware, leasehold improvements, furniture, and equipment, net	$ 145.0	$ 158.6
Software and Software Development Costs
Property, Plant and Equipment [Abstract]
Useful Life	3 years
Minimum
Property, Plant and Equipment [Abstract]
Useful Life	3 years
Maximum
Property, Plant and Equipment [Abstract]
Useful Life	5 years

Business and Summary of Significant Accounting Policies - Other Intangible Assets and Related Accumulated Amortization (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Finite-Lived Intangible Assets, Net [Abstract]
Amortization of intangible assets	$ 20.2	$ 31.8	$ 33.2
Developed technologies, at cost	578.5	583.6
Customer relationships, trade names, patents, and user lists, at cost	372.5	375.9
Other intangible assets, at cost	951.0	959.5
Less: Accumulated amortization	(895.8)	(862.0)
Other intangible assets, net	$ 55.2	97.5
Weighted average useful life	4 years 10 months 24 days
Customer Relationships, Trade Names, Patents, and User List
Finite-Lived Intangible Assets, Net [Abstract]
Amortization of intangible assets	$ 36.6	$ 72.2	$ 82.6
Customer Relationships, Trade Names, Patents, and User List \| Minimum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	2 years
Customer Relationships, Trade Names, Patents, and User List \| Maximum
Finite-Lived Intangible Assets [Line Items]
Finite-lived intangible asset, useful life	10 years

Business and Summary of Significant Accounting Policies - Expected Future Amortization Expense for Purchased Technologies, Customer Relationships and Trade Names (Details) $ in Millions	Jan. 31, 2018 USD ($)
Expected Future Amortization Expense for Purcahsed Technologies, Customer Relationships and Trade Name [Abstract]
2019	$ 28.0
2020	16.1
2021	7.7
2022	3.4
Thereafter	0.0
Total	$ 55.2

Business and Summary of Significant Accounting Policies - Changes In the Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Accounting Policies [Abstract]
Impairment of goodwill	$ 0.0	$ 0.0	$ 0.0
Goodwill, beginning of period, gross		1,710.3	1,684.2
Less: accumulated impairment losses, beginning of the year		(149.2)	$ (149.2)
Additions arising from acquisitions during the year	0.0	62.8
Effect of foreign currency translation, measurement period adjustments, and other (1)	59.1	(36.7)
Goodwill, end of period, net	$ 1,620.2	$ 1,561.1

Business and Summary of Significant Accounting Policies - Impairments of Long-lived Assets (Details) - USD ($)	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Accounting Policies [Abstract]
Impairment of long-lived assets	$ 0	$ 0	$ 0

Business and Summary of Significant Accounting Policies - Stock Based Compensation Expense (Details) $ in Millions	12 Months Ended
	Jan. 31, 2018 USD ($) period	Jan. 31, 2017 USD ($)	Jan. 31, 2016 USD ($)
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to stock awards and Employee Qualified Stock Purchase Plan (ESPP) purchases	$ 261.4	$ 221.8	$ 197.2
Tax benefit	(2.6)	(2.6)	(1.6)
Stock-based compensation expense related to stock awards and ESPP purchases, net	258.8	219.2	195.6
Market capitalization level of peer group	2,000.0
Cost of maintenance and subscription revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to stock awards and Employee Qualified Stock Purchase Plan (ESPP) purchases	11.9	8.6	5.8
Cost of license and other revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to stock awards and Employee Qualified Stock Purchase Plan (ESPP) purchases	4.0	5.5	6.0
Marketing and sales
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to stock awards and Employee Qualified Stock Purchase Plan (ESPP) purchases	107.3	94.1	85.2
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to stock awards and Employee Qualified Stock Purchase Plan (ESPP) purchases	82.9	81.3	70.4
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to stock awards and Employee Qualified Stock Purchase Plan (ESPP) purchases	$ 55.3	$ 32.3	$ 29.8
ESP Plan
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Number of exercise periods \| period	4
Term of exercise period	6 months
Term of offering period	24 months

Business and Summary of Significant Accounting Policies - Assumption Used to Estimate the Fair Value of Stock-Based Awards (Details)	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Performance Stock Unit
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items]
Range of expected volatilities	32.00%		27.00%
Expected dividends	0.00%	0.00%	0.00%
Range of risk-free interest rates			0.20%
Performance Stock Unit \| Minimum
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items]
Range of expected volatilities		38.00%
Range of risk-free interest rates	1.00%	0.60%
Performance Stock Unit \| Maximum
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items]
Range of expected volatilities		39.00%
Range of risk-free interest rates	1.20%	0.70%
ESP Plan
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items]
Expected dividends	0.00%	0.00%	0.00%
ESP Plan \| Minimum
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items]
Range of expected volatilities	31.00%	30.00%	28.00%
Range of expected lives	6 months	6 months	6 months
Range of risk-free interest rates	0.90%	0.50%	0.10%
ESP Plan \| Maximum
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items]
Range of expected volatilities	34.00%	40.00%	29.00%
Range of expected lives	2 years	2 years	2 years
Range of risk-free interest rates	1.40%	0.90%	0.70%

Business and Summary of Significant Accounting Policies - Advertising Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Accounting Policies [Abstract]
Advertising Expense	$ 31.1	$ 33.6	$ 29.8

Business and Summary of Significant Accounting Policies - New Accounting Standards (Details) - Scenario, Forecast - Accounting Standards Update 2014-09 $ in Millions	12 Months Ended
	Jan. 31, 2019 USD ($)
Minimum \| Deferred Revenue
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Expected impact of new accounting pronouncement	$ (80)
Minimum \| Capitalized Sales Commission Costs
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Expected impact of new accounting pronouncement	(102)
Maximum \| Deferred Revenue
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Expected impact of new accounting pronouncement	(100)
Maximum \| Capitalized Sales Commission Costs
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Expected impact of new accounting pronouncement	$ (112)

Financial Instruments - Cost and Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Cash equivalents	$ 1,078.0	$ 1,213.1	$ 1,353.0	$ 1,410.6
Derivative contract assets, Amortized Cost	2.0	2.2
Derivative contract assets, Gross Unrealized Gains	7.5	12.3
Derivative contract assets, Gross Unrealized Losses	(1.3)	(1.3)
Derivative contract assets, fair value	8.2	13.2
Derivative contract liabilities, Amortized Cost	0.0	0.0
Derivative contract liabilities, Gross Unrealized Gains	0.0	0.0
Derivative contract liabilities, Gross Unrealized Losses	(26.6)	(10.4)
Derivative contract liabilities, fair value	(26.6)	(10.4)
Amortized Cost Securities	1,080.2	1,903.5
Unrealized Gain on Securities	17.0	17.4
Unrealized Loss on Securities	(29.2)	(13.6)
Total	1,068.0	1,907.3
Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Trading Securities, Cost	50.1	44.8
Trading Securities, Unrealized Holding Gain	8.9	2.5
Trading Securities, Unrealized Holding Loss	0.0	0.0
Trading Securities	59.0	47.3
Convertible Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Convertible Debt Securities, Amortized Cost	7.5	4.9
Convertible Debt Securities, Unrealized Gains	0.5	2.3
Convertible Debt Securities, Unrealized Losses	(0.2)	(1.6)
Convertible Debt Securities, Fair Value	7.8	5.6
Level 1
Schedule of Available-for-sale Securities [Line Items]
Derivative contract assets, fair value	0.0	0.0
Derivative contract liabilities, fair value	0.0	0.0
Total	392.1	1,193.8
Level 1 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Trading Securities	59.0	47.3
Level 1 \| Convertible Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Convertible Debt Securities, Fair Value	0.0	0.0
Level 2
Schedule of Available-for-sale Securities [Line Items]
Derivative contract assets, fair value	7.2	11.9
Derivative contract liabilities, fair value	(26.6)	(10.4)
Total	667.1	706.6
Level 2 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Trading Securities	0.0	0.0
Level 2 \| Convertible Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Convertible Debt Securities, Fair Value	0.0	0.0
Level 3
Schedule of Available-for-sale Securities [Line Items]
Derivative contract assets, fair value	1.0	1.3
Derivative contract liabilities, fair value	0.0	0.0
Total	8.8	6.9
Level 3 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Trading Securities	0.0	0.0
Level 3 \| Convertible Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Convertible Debt Securities, Fair Value	7.8	5.6
Asset backed securities \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	13.1	19.6
Available-for-sale, Gross unrealized gains	0.0	0.0
Available-for-sale, Gross unrealized losses	0.0	0.0
Available-for-sale Securities, Fair Value	13.1	19.6
Asset backed securities \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	36.8	65.8
Available-for-sale, Gross unrealized gains	0.0	0.1
Available-for-sale, Gross unrealized losses	(0.2)	0.0
Available-for-sale Securities, Fair Value	36.6	65.9
Asset backed securities \| Level 1 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	0.0	0.0
Asset backed securities \| Level 1 \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	0.0	0.0
Asset backed securities \| Level 2 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	13.1	19.6
Asset backed securities \| Level 2 \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	36.6	65.9
Asset backed securities \| Level 3 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	0.0	0.0
Asset backed securities \| Level 3 \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	0.0	0.0
Commercial paper \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	27.5	109.2
Available-for-sale, Gross unrealized gains	0.0	0.0
Available-for-sale, Gross unrealized losses	0.0	0.0
Available-for-sale Securities, Fair Value	27.5	109.2
Commercial paper \| Level 1 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	0.0	0.0
Commercial paper \| Level 2 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	27.5	109.2
Commercial paper \| Level 3 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	0.0	0.0
Corporate debt securities \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	99.4	234.7
Available-for-sale, Gross unrealized gains	0.0	0.0
Available-for-sale, Gross unrealized losses	(0.1)	(0.2)
Available-for-sale Securities, Fair Value	99.3	234.5
Corporate debt securities \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	100.2	172.1
Available-for-sale, Gross unrealized gains	0.1	0.1
Available-for-sale, Gross unrealized losses	(0.4)	(0.1)
Available-for-sale Securities, Fair Value	99.9	172.1
Corporate debt securities \| Level 1 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	99.3	234.5
Corporate debt securities \| Level 1 \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	99.9	172.1
Corporate debt securities \| Level 2 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	0.0	0.0
Corporate debt securities \| Level 2 \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	0.0	0.0
Corporate debt securities \| Level 3 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	0.0	0.0
Corporate debt securities \| Level 3 \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	0.0	0.0
Other \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	9.2
Available-for-sale, Gross unrealized gains	0.0
Available-for-sale, Gross unrealized losses	0.0
Available-for-sale Securities, Fair Value	9.2
Other \| Level 1 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	7.7
Other \| Level 2 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	1.5
Other \| Level 3 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	0.0
U.S. government securities \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	37.1	32.3
Available-for-sale, Gross unrealized gains	0.0	0.0
Available-for-sale, Gross unrealized losses	0.0	0.0
Available-for-sale Securities, Fair Value	37.1	32.3
U.S. government securities \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	25.5	48.8
Available-for-sale, Gross unrealized gains	0.0	0.1
Available-for-sale, Gross unrealized losses	(0.2)	0.0
Available-for-sale Securities, Fair Value	25.3	48.9
U.S. government securities \| Level 1 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	37.1	32.3
U.S. government securities \| Level 1 \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	25.3	48.9
U.S. government securities \| Level 2 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	0.0	0.0
U.S. government securities \| Level 2 \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	0.0	0.0
U.S. government securities \| Level 3 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	0.0	0.0
U.S. government securities \| Level 3 \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	0.0	0.0
Agency bonds \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost		13.2
Available-for-sale, Gross unrealized gains		0.0
Available-for-sale, Gross unrealized losses
Available-for-sale Securities, Fair Value		13.2
Agency bonds \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	13.7	7.1
Available-for-sale, Gross unrealized gains	0.0	0.0
Available-for-sale, Gross unrealized losses	(0.1)	0.0
Available-for-sale Securities, Fair Value	13.6	7.1
Agency bonds \| Level 1 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value		13.2
Agency bonds \| Level 1 \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	13.6	7.1
Agency bonds \| Level 2 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value		0.0
Agency bonds \| Level 2 \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	0.0	0.0
Agency bonds \| Level 3 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value		0.0
Agency bonds \| Level 3 \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	0.0	0.0
Certificates of deposit \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost		157.3
Available-for-sale, Gross unrealized gains		0.0
Available-for-sale, Gross unrealized losses		0.0
Available-for-sale Securities, Fair Value		157.3
Certificates of deposit \| Level 1 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value		157.3
Certificates of deposit \| Level 2 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value		0.0
Certificates of deposit \| Level 3 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value		0.0
Municipal bonds \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost		43.4
Available-for-sale, Gross unrealized gains		0.0
Available-for-sale, Gross unrealized losses		0.0
Available-for-sale Securities, Fair Value		43.4
Municipal bonds \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	12.7	10.7
Available-for-sale, Gross unrealized gains	0.0	0.0
Available-for-sale, Gross unrealized losses	(0.1)	0.0
Available-for-sale Securities, Fair Value	12.6	10.7
Municipal bonds \| Level 1 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value		43.4
Municipal bonds \| Level 1 \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	12.6	10.7
Municipal bonds \| Level 2 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value		0.0
Municipal bonds \| Level 2 \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	0.0	0.0
Municipal bonds \| Level 3 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value		0.0
Municipal bonds \| Level 3 \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	0.0	0.0
Sovereign debt \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost		30.0
Available-for-sale, Gross unrealized gains		0.0
Available-for-sale, Gross unrealized losses		0.0
Available-for-sale Securities, Fair Value		30.0
Sovereign debt \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	2.8	1.5
Available-for-sale, Gross unrealized gains	0.0	0.0
Available-for-sale, Gross unrealized losses	0.0	0.0
Available-for-sale Securities, Fair Value	2.8	1.5
Sovereign debt \| Level 1 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value		0.0
Sovereign debt \| Level 1 \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	0.0	0.0
Sovereign debt \| Level 2 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value		30.0
Sovereign debt \| Level 2 \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	2.8	1.5
Sovereign debt \| Level 3 \| Marketable Securities, Current
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value		0.0
Sovereign debt \| Level 3 \| Marketable Securities, Noncurrent
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Fair Value	0.0	0.0
Agency bonds
Schedule of Available-for-sale Securities [Line Items]
Cash equivalents	5.0	6.0
Cash and Cash Equivalents, Fair Value Disclosure	5.0	6.0
Agency bonds \| Level 1
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	5.0	6.0
Agency bonds \| Level 2
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Agency bonds \| Level 3
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Certificates of deposit
Schedule of Available-for-sale Securities [Line Items]
Cash equivalents	17.4	63.1
Cash and Cash Equivalents, Fair Value Disclosure	17.4	63.1
Certificates of deposit \| Level 1
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	17.4	63.1
Certificates of deposit \| Level 2
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Certificates of deposit \| Level 3
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Commercial paper
Schedule of Available-for-sale Securities [Line Items]
Cash equivalents	324.2	207.4
Cash and Cash Equivalents, Fair Value Disclosure	324.2	207.4
Commercial paper \| Level 1
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Commercial paper \| Level 2
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	324.2	207.4
Commercial paper \| Level 3
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Cash equivalents	5.0	40.2
Cash and Cash Equivalents, Fair Value Disclosure	5.0	40.2
Corporate debt securities \| Level 1
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	5.0	40.2
Corporate debt securities \| Level 2
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Corporate debt securities \| Level 3
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Custody cash deposit
Schedule of Available-for-sale Securities [Line Items]
Cash equivalents	5.2	3.2
Cash and Cash Equivalents, Fair Value Disclosure	5.2	3.2
Custody cash deposit \| Level 1
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	5.2	3.2
Custody cash deposit \| Level 2
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Custody cash deposit \| Level 3
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Money market funds
Schedule of Available-for-sale Securities [Line Items]
Cash equivalents	278.8	256.5
Cash and Cash Equivalents, Fair Value Disclosure	278.8	256.5
Money market funds \| Level 1
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Money market funds \| Level 2
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	278.8	256.5
Money market funds \| Level 3
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Cash equivalents	5.0	5.0
Cash and Cash Equivalents, Fair Value Disclosure	5.0	5.0
Municipal bonds \| Level 1
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	5.0	5.0
Municipal bonds \| Level 2
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Municipal bonds \| Level 3
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Sovereign debt
Schedule of Available-for-sale Securities [Line Items]
Cash equivalents	2.0	15.0
Cash and Cash Equivalents, Fair Value Disclosure	2.0	15.0
Sovereign debt \| Level 1
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	0.0	0.0
Sovereign debt \| Level 2
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	2.0	15.0
Sovereign debt \| Level 3
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	$ 0.0	0.0
U.S. government securities
Schedule of Available-for-sale Securities [Line Items]
Cash equivalents		309.5
Cash and Cash Equivalents, Fair Value Disclosure		309.5
U.S. government securities \| Level 1
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure		309.5
U.S. government securities \| Level 2
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure		0.0
U.S. government securities \| Level 3
Schedule of Available-for-sale Securities [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure		$ 0.0

Financial Instruments - Reconciliation of the Change in Level 3 Items (Details) $ in Millions	12 Months Ended
	Jan. 31, 2018 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 6.9
Purchases	7.0
Gains (losses) included in earnings	(4.6)
Gains included in OCI	(0.5)
Ending Balance	8.8
Derivative Contracts
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	1.3
Purchases	1.1
Gains (losses) included in earnings	(1.4)
Gains included in OCI	0.0
Ending Balance	1.0
Convertible Debt Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	5.6
Purchases	5.9
Gains (losses) included in earnings	(3.2)
Gains included in OCI	(0.5)
Ending Balance	$ 7.8

Financial Instruments - Contractual Maturities of Types of Securities (Details) $ in Millions	Jan. 31, 2018 USD ($)
Cost
Due within in 1 year	$ 193.8
Due in 1 year through 5 years	186.9
Due in 5 years through 10 years	3.7
Due after 10 years	1.1
Total	385.5
Fair Value
Due within in 1 year	194.0
Due in 1 year through 5 years	186.0
Due in 5 years through 10 years	3.7
Due after 10 years	1.1
Total	$ 384.8

Financial Instruments - Available for Sale Securities (Detail) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Investments, All Other Investments [Abstract]
Cost method investments	$ 112.3	$ 117.2
Other than temporary impairment losses, investments	15.5	1.3
Available-for-sale securities gross gains (losses)	(0.3)	1.5	$ 0.1
Proceeds from sale and maturity of marketable securities	$ 1,100.0	$ 2,300.0

Financial Instruments - Fair Value of Derivative Instruments (Detail) - USD ($) $ in Millions	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Derivatives, Fair Value [Line Items]
Notional amount of foreign currency forward contracts not designated as cash flow hedges	$ 619.9	$ 369.4
Net loss expected to be recognized into earnings	(256.0)	733.6	$ 1,619.6	$ 2,219.2
Derivative asset, net	8.2	13.3
Derivative liability, net	26.6	10.5
Net Unrealized Gains (Losses) on Derivative Instruments
Derivatives, Fair Value [Line Items]
Net loss expected to be recognized into earnings	(16.6)	14.6	$ 15.7
Foreign Exchange Contracts
Derivatives, Fair Value [Line Items]
Notional amount of foreign currency forward contracts not designated as cash flow hedges	329.6	270.6
Designated as Hedging Instrument \| Foreign Exchange Contracts \| Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, net	6.2	10.1
Designated as Hedging Instrument \| Foreign Exchange Contracts \| Other Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, net	18.7	4.5
Not Designated as Hedging Instrument \| Other assets
Derivatives, Fair Value [Line Items]
Derivative asset, net	2.0	3.2
Not Designated as Hedging Instrument \| Other Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, net	$ 7.9	$ 6.0

Financial Instruments - Effects of Derivative Instruments on Condensed Consolidated Statements of Operations (Detail) - Foreign Exchange Contracts - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount of (loss) gain recognized in accumulated other comprehensive loss on derivatives (effective portion)	$ (21.3)	$ 6.3	$ 2.2
Amount and location of gain (loss) reclassified from accumulated other comprehensive loss into (loss) income (effective portion)	9.9	7.4	29.3
Designated as Hedging Instrument \| Net revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount and location of gain (loss) reclassified from accumulated other comprehensive loss into (loss) income (effective portion)	8.0	9.2	39.8
Designated as Hedging Instrument \| Operating expenses
Derivative Instruments, Gain (Loss) [Line Items]
Amount and location of gain (loss) reclassified from accumulated other comprehensive loss into (loss) income (effective portion)	1.9	(1.8)	(10.5)
Designated as Hedging Instrument \| Interest and other expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount and location of loss recognized in (loss) income on derivatives (ineffective portion and amount excluded from effectiveness testing)	(0.2)	(0.3)	(0.7)
Not Designated as Hedging Instrument \| Interest and other expense, net
Derivative Instruments, Gain (Loss) [Line Items]
Amount and location of loss recognized in loss (income) on derivatives	$ (19.1)	$ (11.1)	$ (1.7)

Employee and Director Stock Plans - Stock-Based Compensation Expense - Additional Information (Detail) $ / shares in Units, $ in Millions		12 Months Ended			73 Months Ended
	Mar. 12, 2015 shares	Jan. 31, 2018 USD ($) period Plan $ / shares shares	Jan. 31, 2017 USD ($) $ / shares shares	Jan. 31, 2016 USD ($) $ / shares	Jan. 31, 2018 shares
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Number of active stock plans \| Plan		2
Number of additional share authorized (in shares)					36,100,000
Shares available for future issuance (in shares)		31,300,000			31,300,000
Employee Stock Plan 2012
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Shares of common stock reserved for issuance (in shares)		57,300,000			57,300,000
Restricted stock award, net of forfeitures (in shares)		51,300,000
Shares forfeited (in shares)		6,000,000.0
Shares granted to shares issued (in shares)		1.79
Shares available for future issuance (in shares)		21,300,000			21,300,000
Directors stock plan 2012
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Shares of common stock reserved for issuance (in shares)		1,700,000			1,700,000
Shares granted to shares issued (in shares)		2.11
Shares available for future issuance (in shares)		900,000			900,000
Reduction of shares reserved for issuance (in shares)	900,000
Outside directors stock plan 2012 \| Minimum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Vesting period		1 year
Outside directors stock plan 2012 \| Maximum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Vesting period		3 years
ESP Plan
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Shares available for future issuance (in shares)		9,100,000			9,100,000
Percentage of compensation that eligible employees can use to purchase common stock, maximum		15.00%
Percentage of fair market value eligible employees can purchase common stock, minimum		85.00%
Number of exercise periods \| period		4
Term of exercise period		6 months
Term of offering period		24 months
Employee service share based compensation recognized compensation costs on nonvested restricted shares \| $		$ 25.7	$ 25.9	$ 27.1
Stock Options and Restricted Stock \| Employee Stock Plan 2012
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Grants in period, net of forfeitures (in shares)		41,100,000
Share based payment award options expiration term (in years)		10 years
Restricted Stock Units (RSUs) and Performance Stock Units (PSUs)
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Granted (in dollars per share) \| $ / shares		$ 106.55	$ 65.95	$ 52.53
Fair value of units vested in period \| $		$ 399.7	$ 232.2	$ 193.3
Restricted stock granted (in shares)		2,481,800
Number of awards granted but unreleased		5,670,700	7,622,400		5,670,700
Restricted Stock Units (RSUs)
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Restricted stock granted (in shares)		2,200,000
Share based compensation expense, restricted stock units \| $		$ 202.1	$ 173.0	146.4
Total compensation cost related to non-vested awards not yet recognized \| $		$ 310.2
Total compensation cost related to non-vested awards not yet recognized, weighted average period of recognition (in years)		1 year 7 months 24 days
Number of awards granted but unreleased		5,100,000			5,100,000
Restricted Stock Units (RSUs) \| Maximum
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Vesting period		3 years
Restricted Stock Units (RSUs) \| Directors stock plan 2012
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Grants in period, net of forfeitures (in shares)		900,000
Performance Stock Units (PSUs)
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Vesting period		3 years
Restricted stock granted (in shares)		300,000
Share based compensation expense, restricted stock units \| $		$ 33.7	$ 22.9	$ 23.2
Total compensation cost related to non-vested awards not yet recognized \| $		$ 6.8
Total compensation cost related to non-vested awards not yet recognized, weighted average period of recognition (in years)		9 months 3 days
Number of awards granted but unreleased		600,000			600,000
Performance Stock Units (PSUs) \| Year One
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Vesting percentage (up to percentage)		33.33%
Performance Stock Units (PSUs) \| Year Two
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Vesting percentage (up to percentage)		33.33%
Performance Stock Units (PSUs) \| Year Three
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Vesting percentage (up to percentage)		33.33%
Chief Executive Officer \| Performance Stock Units (PSUs)
Compensation Related Costs Share Based Payments Disclosure [Line Items]
Accelerated stock based compensation costs \| $		$ 7.3

Employee and Director Stock Plans - Schedule Of Share-based Compensation Options Activity (Detail) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Jan. 31, 2018 USD ($) $ / shares shares
Number of Shares
Options outstanding (in shares) \| shares	0.6
Exercised (in shares) \| shares	(0.4)
Options outstanding (in shares) \| shares	0.2
Options available for grant (in shares) \| shares	22.2
Weighted average price per share
Options outstanding, beginning balance (per share) \| $ / shares	$ 39.25
Exercised (per share) \| $ / shares	38.66
Options outstanding, ending balance (per share) \| $ / shares	$ 40.49
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Options outstanding, Weighted average contractual term	2 years 10 months 13 days
Options outstanding, Aggregate Intrinsic Value \| $	$ 16.4
Closing stock price (in dollars per share) \| $ / shares	$ 115.62

Employee and Director Stock Plans - Intrinsic Value of Options Exercised and Weighted Average Grant Date Fair Value of Stock Options Granted (Detail) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Pre-tax intrinsic value of options exercised	$ 22.8	$ 32.0	$ 32.6

Employee and Director Stock Plans - Options Outstanding and Exercisable (Detail)	Jan. 31, 2018 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Vested and Exercisable, Number of Shares \| shares	218,800
Options Vested and Exercisable, Weighted average exercise price (in dollars per share)	$ 40.49
$28.56 - $36.44
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of per-share exercise prices, Lower Limit	28.56
Range of per-share exercise prices, Upper Limit	$ 36.44
Options Vested and Exercisable, Number of Shares \| shares	32,600
Options Vested and Exercisable, Weighted average exercise price (in dollars per share)	$ 34.23
$38.55 - $38.55
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of per-share exercise prices, Lower Limit	38.55
Range of per-share exercise prices, Upper Limit	$ 38.55
Options Vested and Exercisable, Number of Shares \| shares	1,800
Options Vested and Exercisable, Weighted average exercise price (in dollars per share)	$ 38.55
$41.62 - $41.62
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Range of per-share exercise prices, Lower Limit	41.62
Range of per-share exercise prices, Upper Limit	$ 41.62
Options Vested and Exercisable, Number of Shares \| shares	184,400
Options Vested and Exercisable, Weighted average exercise price (in dollars per share)	$ 41.62

Employee and Director Stock Plans - Summary of Restricted Stock Award and Restricted Stock Unit Activity (Detail) - Restricted Stock Units (RSUs) and Performance Stock Units (PSUs) - $ / shares	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Unreleased restricted stock
Unvested restricted stock units, beginning balance (in shares)	7,622,400
Granted (in shares)	2,481,800
Vested (in shares)	(3,765,700)
Canceled/Forfeited (in shares)	(692,500)
Performance adjustment (in shares)	24,700
Unvested restricted stock, ending balance (in shares)	5,670,700	7,622,400
Weighted average grant date fair value
Beginning balance of unvested restricted stock units (in dollars per share)	$ 60.13
Granted (in dollars per share)	106.55	$ 65.95	$ 52.53
Vested (in dollars per share)	57.85
Canceled/Forfeited (in dollars per share)	69.08
Performance adjustment (in dollars per share)	61.79
Ending balance of unvested restricted stock (in dollars per share)	$ 82.94	$ 60.13
Minimum
Weighted average grant date fair value
Performance shares payout		99.70%
Maximum
Weighted average grant date fair value
Performance shares payout		114.70%

Employee and Director Stock Plans - ESPP Activity (Details) - Employee Stock - Employee Qualified Stock Purchase Plan 1998 ESP Plan - $ / shares shares in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issued shares (in shares)	2.0	2.3	2.1
Average price of issued shares (in dollars per share)	$ 39.03	$ 36.99	$ 36.29
Weighted average grant date fair value of awards granted under the ESPP (in dollars per share)	$ 32.41	$ 19.20	$ 11.85

Employee and Director Stock Plans - Options Outstanding (Details) - $ / shares shares in Millions	Jan. 31, 2018	Jan. 31, 2017
Number of securities to be issued upon exercise of outstanding options (in shares)	5.9
Weighted-average exercise price (per share)	$ 40.49	$ 39.25
Shares available for future issuance (in shares)	31.3
Equity Compensation Plans Approved by Security Holders
Number of securities to be issued upon exercise of outstanding options (in shares)	5.9
Weighted-average exercise price (per share)	$ 40.49
Shares available for future issuance (in shares)	31.3
ESP Plan
Shares available for future issuance (in shares)	9.1

Income Taxes - Provision for income taxes (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Federal:
Current									$ (0.8)	$ 1.6	$ (4.7)
Deferred									(19.3)	8.4	220.9
State:
Current									(0.3)	(1.9)	0.5
Deferred									2.2	1.3	20.9
Foreign:
Current									50.9	93.9	68.4
Deferred									(23.1)	(45.0)	4.2
Income tax expense	$ (24.8)	$ 8.6	$ 17.6	$ 8.2	$ 5.2	$ 13.5	$ 25.2	$ 14.4	$ 9.6	$ 58.3	$ 310.2

Income Taxes - Income Taxes Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Income Taxes [Line Items]
Foreign pretax income (loss)	$ (76.2)	$ (27.6)	$ 218.2
Valuation allowance	$ (113.8)	352.4	327.2
Blended income tax rate	33.81%
Tax Cuts and Jobs Act of 2017, provisional income tax benefit	$ 32.3
Gross unrecognized tax benefits	337.6	261.4	254.3	$ 245.8
Unrecognized tax benefits that would reduce the valuation allowance if recognized	304.8
Amount of gross unrecognized tax benefits that would impact the effective tax rate, if recognized	32.8
Unrecognized tax benefits	2.8	2.5	3.3
Income tax expense from penalties and interest	0.3	1.5	1.3
Foreign income tax expense (benefit)	0.0	$ 27.1	$ 0.0
Income tax benefits per share		$ 0.12
Domestic Country
Income Taxes [Line Items]
Operating loss carryforwards	179.4
Domestic Country \| Research Tax Credit Carryforward
Income Taxes [Line Items]
Tax credit carryforward	138.4
State and Local Jurisdiction
Income Taxes [Line Items]
Operating loss carryforwards	939.1
State and Local Jurisdiction \| Research Tax Credit Carryforward
Income Taxes [Line Items]
Tax credit carryforward	72.6
Foreign Country
Income Taxes [Line Items]
Deferred income taxes, net	68.0
Tax credit carryforward	336.9
Foreign Country \| Canada
Income Taxes [Line Items]
Tax credit carryforward	$ 58.1

Income Taxes - Income Taxes Differences between the U.S. statutory rate and the aggregate income tax provision (Details) - USD ($)	3 Months Ended								12 Months Ended
	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Income Tax Disclosure [Abstract]
First $1M of officer compensation									$ 1,000,000,000,000
Income tax provision (benefit) at U.S. Federal statutory rate									(188,400,000)	$ (177,000,000.0)	$ (7,100,000)
State income tax benefit, net of the U.S. Federal benefit									(21,900,000)	(17,300,000)	(7,600,000)
Foreign income taxed at rates different from the U.S. statutory rate									(53,300,000)	22,300,000	(29,400,000)
U.S. valuation allowance									(82,500,000)	233,000,000.0	345,000,000.0
Transition tax									408,400,000	0	0
Increase in attributes due to ASU 2016-9 adoption										(119,400,000)	0
Change in valuation allowance from ASU 2016-9 adoption									0	119,400,000	0
Tax effect of non-deductible stock-based compensation									20,700,000	18,800,000	19,300,000
Stock compensation windfall / shortfall									(67,700,000)	(23,000,000.0)	0
Research and development tax credit benefit									(11,300,000)	(10,300,000)	(9,400,000)
Closure of income tax audits and changes in uncertain tax positions									1,200,000	8,200,000	(4,700,000)
Tax effect of officer compensation in excess of $1.0 million									2,200,000	2,200,000	1,400,000
Non-deductible expenses									2,100,000	2,000,000.0	2,600,000
Other									100,000	(600,000)	100,000
Income tax expense	$ (24,800,000)	$ 8,600,000	$ 17,600,000	$ 8,200,000	$ 5,200,000	$ 13,500,000	$ 25,200,000	$ 14,400,000	$ 9,600,000	$ 58,300,000	$ 310,200,000

Income Taxes - Income Taxes Components Of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Jan. 31, 2018	Jan. 31, 2017
Income Tax Disclosure [Abstract]
Stock-based compensation	$ 26.7	$ 37.6
Research and development tax credit carryforwards	170.3	136.7
Foreign tax credit carryforwards	162.2	127.3
Accrued compensation and benefits	25.9	39.5
Other accruals not currently deductible for tax	22.9	18.7
Purchased technology and capitalized software	43.4	76.9
Fixed assets	16.5	24.3
Tax loss carryforwards	85.7	173.6
Deferred revenue	120.3	128.3
Other	32.4	27.6
Total deferred tax assets	706.3	790.5
Less: valuation allowance	(634.2)	(748.0)
Net deferred tax assets	72.1	42.5
Indefinite lived intangibles	(57.0)	(70.1)
Total deferred tax liabilities	(57.0)	(70.1)
Net deferred tax assets	$ 15.1
Net deferred tax liabilities		$ (27.6)

Income Taxes - Income Taxes Unrecognized Tax Benefits Reconciliation, Table (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Gross unrecognized tax benefits at the beginning of the fiscal year	$ 261.4	$ 254.3	$ 245.8
Increases for tax positions of prior years	22.8	11.9	1.4
Decreases for tax positions of prior years	(22.5)	(4.1)	(7.0)
Increases for tax positions related to the current year	78.4	11.1	15.8
Decreases relating to settlements with taxing authorities	(0.8)	(10.8)	(0.5)
Reductions as a result of lapse of the statute of limitations	(1.7)	(1.0)	(1.2)
Gross unrecognized tax benefits at the end of the fiscal year	$ 337.6	$ 261.4	$ 254.3

Acquisitions - Summary of Fair Value of Assets Acquired and Liabilities Assumed by Major Class (Detail) - USD ($) $ in Millions	Jan. 31, 2018	Jan. 31, 2017
Business Acquisition [Line Items]
Goodwill	$ 1,620.2	$ 1,561.1
Other
Business Acquisition [Line Items]
Goodwill		62.8
Deferred revenue (current and non-current)		(2.1)
Deferred tax liability		(7.1)
Net tangible (liabilities) assets		0.6
Total		87.0
Other \| Developed technologies
Business Acquisition [Line Items]
Intangible assets		18.8
Other \| Customer relationships
Business Acquisition [Line Items]
Intangible assets		10.2
Other \| Trade name
Business Acquisition [Line Items]
Intangible assets		$ 3.8

Acquisitions - Additional Information (Details) $ in Millions	Jan. 31, 2017 USD ($)
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Cash consideration transferred for acqusitions and business combinations	$ 87.0

Deferred Compensation - Additional Information (Detail) - USD ($) $ in Millions	Jan. 31, 2018	Jan. 31, 2017
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Marketable securities	$ 436.0
Rabbi Trust
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Deferred compensation liability current	3.4	$ 3.1
Deferred compensation liability non-current	55.6	44.2
Marketable Securities, Current
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Trading securities	59.0	47.3
Marketable Securities, Current \| Rabbi Trust
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Trading securities	$ 59.0	$ 47.3

Borrowing Arrangements (Detail) - USD ($)	1 Months Ended				12 Months Ended
Borrowing Arrangements (Detail) - USD ($)	Jul. 31, 2017	Jun. 30, 2017	Jun. 30, 2015	Dec. 31, 2012	Jan. 31, 2018	Jan. 31, 2017
Debt Disclosure [Line Items]
Unsecured revolving credit facility					$ 400,000,000.0
Unsecured revolving credit facility, option to request an increase in the amount of the credit facility up to					100,000,000.0
Line of credit facility, outstanding borrowings					0	$ 0
Senior Notes \| 3.5% Notes due 2027
Debt Disclosure [Line Items]
Face amount		$ 500,000,000.0
Stated interest rate		3.50%
Unamortized discount		$ 3,100,000
Debt issuance costs		4,900,000
Proceeds from debt, net of issuance costs		$ 492,000,000.0
Debt redemption percentage of principle amount (as a percent)		101.00%
Fair value disclosure					485,600,000
Senior Notes \| Senior Notes due 2017
Debt Disclosure [Line Items]
Face amount				$ 400,000,000.0
Stated interest rate				1.95%
Debt redemption price	$ 400,900,000
Repayments of debt	$ 401,800,000
Senior Notes \| Senior Notes due 2020
Debt Disclosure [Line Items]
Face amount			$ 450,000,000.0
Stated interest rate			3.125%
Senior Notes \| Senior Notes due 2025
Debt Disclosure [Line Items]
Face amount			$ 300,000,000.0
Stated interest rate			4.375%
Senior Notes \| 2015 Senior Notes
Debt Disclosure [Line Items]
Unamortized discount			$ 1,700,000
Debt issuance costs			6,300,000
Proceeds from debt, net of issuance costs			$ 742,000,000.0
Debt redemption percentage of principle amount (as a percent)			101.00%
Fair value disclosure					763,800,000
Senior Notes \| Senior Notes due 2022
Debt Disclosure [Line Items]
Face amount				$ 350,000,000.0
Stated interest rate				3.60%
Senior Notes \| 2012 Senior Notes
Debt Disclosure [Line Items]
Unamortized discount				$ 4,500,000
Debt issuance costs				6,100,000
Proceeds from debt, net of issuance costs				$ 739,300,000
Fair value disclosure					$ 354,400,000

Commitments and Contingencies - Future Minimum Lease Payments (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Future Minimum Lease Payments [Abstract]
2019	$ 62.2
2020	46.3
2021	34.1
2022	24.7
2023	22.8
Thereafter	57.7
Future minimum lease payments required	247.8
Less: Sublease income	0.8
Future minimum lease payments required, net	247.0
Rent expense	$ 55.9	$ 65.3	$ 58.7

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Total non cancellable purchase commitments	$ 147.6
Royalty expense recorded under cost of license and other revenue	$ 15.3	$ 16.2	$ 17.4

Stockholders' (Deficit) Equity (Details) - $ / shares	12 Months Ended
Stockholders' (Deficit) Equity (Details) - $ / shares	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Stockholders Equity Note [Line Items]
Preferred stock, shares authorized (in shares)	2,000,000.0	2,000,000.0
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common Stock Repurchase Program
Stockholders Equity Note [Line Items]
Repurchase and retirement of common shares (in shares)	6,900,000	9,700,000	8,500,000
Average repurchase price per share (usd per share)	$ 100.45	$ 64.73	$ 53.58
Common stock shares remained available for repurchase under repurchase plans (in shares)	19,600,000

Interest and Other Expense, net (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Interest and Other Income, net [Abstract]
Interest and investment expense, net	$ (34.5)	$ (29.7)	$ (33.9)
Loss on foreign currency	(3.3)	(3.3)	0.0
(Loss) gain on strategic investments	(16.4)	0.3	3.8
Other income	6.0	8.5	8.5
Interest and other expense, net	$ (48.2)	$ (24.2)	$ (21.6)

Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	$ 733.6	$ 1,619.6	$ 2,219.2
Other comprehensive income (loss) before reclassifications	65.5	(47.4)
Pre-tax (gains) losses reclassified from accumulated other comprehensive income	(8.6)	(7.7)
Tax effects	(2.2)	(2.3)
Total other comprehensive income (loss)	54.7	(57.4)	(67.8)
Ending Balance	(256.0)	733.6	1,619.6
Net Unrealized Gains (Losses) on Derivative Instruments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	14.6	15.7
Other comprehensive income (loss) before reclassifications	(24.5)	7.4
Pre-tax (gains) losses reclassified from accumulated other comprehensive income	(9.9)	(7.4)
Tax effects	3.2	(1.1)
Total other comprehensive income (loss)	(31.2)	(1.1)
Ending Balance	(16.6)	14.6	15.7
Net Unrealized Gains (Losses) on Available for Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	1.5	0.2
Other comprehensive income (loss) before reclassifications	(0.6)	3.3
Pre-tax (gains) losses reclassified from accumulated other comprehensive income	0.3	(1.5)
Tax effects	0.1	(0.5)
Total other comprehensive income (loss)	(0.2)	1.3
Ending Balance	1.3	1.5	0.2
Defined Benefit Pension Components
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(33.8)	(28.3)
Other comprehensive income (loss) before reclassifications	4.3	(5.8)
Pre-tax (gains) losses reclassified from accumulated other comprehensive income	0.9	1.2
Tax effects	(0.7)	(0.9)
Total other comprehensive income (loss)	4.5	(5.5)
Ending Balance	(29.3)	(33.8)	(28.3)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(160.8)	(108.7)
Other comprehensive income (loss) before reclassifications	86.3	(52.3)
Pre-tax (gains) losses reclassified from accumulated other comprehensive income	0.1	0.0
Tax effects	(4.8)	0.2
Total other comprehensive income (loss)	81.6	(52.1)
Ending Balance	(79.2)	(160.8)	(108.7)
Accumulated other comprehensive (loss) income
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning Balance	(178.5)	(121.1)	(53.3)
Ending Balance	$ (123.8)	$ (178.5)	$ (121.1)

Net Loss Per Share - Computation of Net Income Per Share Amounts (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Numerator:
Net loss	$ (173.5)	$ (119.8)	$ (144.0)	$ (129.6)	$ (173.4)	$ (142.8)	$ (98.2)	$ (167.7)	$ (566.9)	$ (582.1)	$ (330.5)
Denominator:
Denominator for basic net loss per share—weighted average shares									219.5	222.7	226.0
Effect of dilutive securities									0.0	0.0	0.0
Denominator for dilutive net loss per share									219.5	222.7	226.0
Basic net loss per share (usd per share)	$ (0.79)	$ (0.55)	$ (0.66)	$ (0.59)	$ (0.78)	$ (0.64)	$ (0.44)	$ (0.75)	$ (2.58)	$ (2.61)	$ (1.46)
Diluted net loss per share (usd per share)	$ (0.79)	$ (0.55)	$ (0.66)	$ (0.59)	$ (0.78)	$ (0.64)	$ (0.44)	$ (0.75)	$ (2.58)	$ (2.61)	$ (1.46)
Antidilutive securities (in shares)									4.5	4.6	4.7

Net Loss Per Share - Additional Information (Detail) - shares shares in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive shares excluded from the computation of diluted net income per share (in shares)	4.5	4.6	4.7
Treasury Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive shares excluded from the computation of diluted net income per share (in shares)	0.5	0.1	0.1

Segment, Geographic and Product Family Information - Operations by Geographic Area and Product Family (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Segment Reporting Information [Line Items]
Net revenue	$ 553.8	$ 515.3	$ 501.8	$ 485.7	$ 478.8	$ 489.6	$ 550.7	$ 511.9	$ 2,056.6	$ 2,031.0	$ 2,504.1
Total long-lived assets	145.0				158.6				145.0	158.6
Architecture, Engineering and Construction
Segment Reporting Information [Line Items]
Net revenue									866.5	880.9	949.1
Manufacturing
Segment Reporting Information [Line Items]
Net revenue									589.2	625.8	724.6
AutoCAD and AutoCAD LT
Segment Reporting Information [Line Items]
Net revenue									401.4	326.7	594.8
Media and Entertainment
Segment Reporting Information [Line Items]
Net revenue									152.0	138.9	160.0
Other
Segment Reporting Information [Line Items]
Net revenue									47.5	58.7	75.6
U.S.
Segment Reporting Information [Line Items]
Net revenue									740.4	742.1	803.9
Total long-lived assets	99.3				118.8				99.3	118.8
Other Americas
Segment Reporting Information [Line Items]
Net revenue									130.7	129.8	168.9
Total long-lived assets	14.6				5.9				14.6	5.9
Total Americas
Segment Reporting Information [Line Items]
Net revenue									871.1	871.9	972.8
Total long-lived assets	113.9				124.7				113.9	124.7
Europe, Middle East, and Africa
Segment Reporting Information [Line Items]
Net revenue									815.4	800.4	934.6
Total long-lived assets	16.7				18.7				16.7	18.7
Asia Pacific
Segment Reporting Information [Line Items]
Net revenue									370.1	358.7	$ 596.7
Total long-lived assets	$ 14.4				$ 15.2				$ 14.4	$ 15.2

Retirement Benefit Plans - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Retirement Benefits [Abstract]
Funded percentage	77.00%
Accumulated benefit obligation	$ 139.5	$ 128.2
Actual plan asset allocations	44.00%	43.00%
Estimated future employer contributions in next fiscal year	$ 4.7
Expected long-term rate of return on plan assets	3.30%	4.30%	3.80%
Domestic Plan
Defined Contribution Plan Disclosure [Line Items]
Maximum annual contributions per employee	75.00%
Cost Recognized	$ 17.3	$ 16.4	$ 17.3
Foreign Plan
Defined Contribution Plan Disclosure [Line Items]
Contributions paid by employer	$ 27.2	$ 26.6	$ 23.0

Retirement Benefit Plans - Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Beginning projected benefit obligation	$ 146.4	$ 145.2
Service cost	5.2	5.6	$ 5.7
Interest cost	2.7	3.0	3.3
Actuarial (gain) loss	(2.8)	7.1
Benefits paid	(3.3)	(2.6)
Foreign currency exchange rate changes	13.9	(9.5)
Curtailments and settlements	(8.2)	(6.8)
Contributions by plan participants	4.0	4.4
Plan amendment	0.2	0.0
Ending projected benefit obligation	158.1	146.4	145.2
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Beginning fair value of plan assets	107.4	101.4
Actual return on plan assets	3.8	4.2
Contributions paid by employer	6.5	15.3
Contributions paid by plan participants	4.0	4.4
Benefit payments	(3.3)	(2.6)
Curtailments and settlements	(8.0)	(6.8)
Foreign currency exchange rate changes	10.7	(8.5)
Ending fair value of plan assets	121.1	107.4	$ 101.4
Funded status	$ (37.0)	$ (39.0)

Retirement Benefit Plans - Balance Sheet (Details) - USD ($) $ in Millions	Jan. 31, 2018	Jan. 31, 2017
Retirement Benefits [Abstract]
Other long-term liabilities	$ 37.0	$ 39.0
Accumulated other comprehensive loss, before tax	31.7	37.0
Net amount recognized	$ 68.7	$ 76.0

Retirement Benefit Plans - Plan Assets (Details) - USD ($) $ in Millions	Jan. 31, 2018	Jan. 31, 2017
Plans with accumulated benefit obligations in excess of plan assets:
Accumulated benefit obligations	$ 130.7	$ 119.2
Plan assets	112.1	98.3
Plans with projected benefit obligations in excess of plan assets:
Projected benefit obligations	158.1	146.4
Plan assets	$ 121.1	$ 107.4

Retirement Benefit Plans - Allocation of Plan Assets (Details) - USD ($) $ in Millions	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	$ 121.1	$ 107.4	$ 101.4
Insurance contracts
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	53.0	46.3
Insurance contracts \| Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0.0
Insurance contracts \| Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	53.0
Insurance contracts \| Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0.0
Other Investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	17.0	9.4
Other Investments \| Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0.0
Other Investments \| Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	17.0
Other Investments \| Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0.0
Investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	70.0	55.7
Investments \| Level 1
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0.0
Investments \| Level 2
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	70.0
Investments \| Level 3
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0.0
Cash
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	0.2	0.0
Investment Fund valued using net asset value
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value of plan assets	$ 50.9	$ 51.7

Retirement Benefit Plans - Estimated Payments (Details) $ in Millions	Jan. 31, 2018 USD ($)
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2019	$ 7.1
2020	6.5
2021	6.4
2022	6.4
2023	6.4
2024-2028	$ 34.8

Retirement Benefit Plans - Net Periodic Benefit Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Retirement Benefits [Abstract]
Service cost for benefits earned during the period	$ 5.2	$ 5.6	$ 5.7
Interest cost on projected benefit obligation	2.7	3.0	3.3
Expected return on plan assets	(3.9)	(4.2)	(3.9)
Amortization of prior service credit	(0.3)	(0.3)	(0.1)
Amortization of loss	1.2	1.5	1.4
Settlement loss	1.9	1.2	0.0
Curtailment gain	(0.1)	0.0	0.0
Net periodic benefit cost	$ 6.7	$ 6.8	$ 6.4

Retirement Benefit Plans - Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Tax, after Reclassification Adjustment, Attributable to Parent [Abstract]
Prior service credit for period	$ 0.2	$ 0.0	$ (2.2)
Net (gain) loss for period	(2.5)	7.2	9.1
Effect of settlement	(1.9)	(1.2)	0.0
Effect of curtailment	(0.2)	0.0	0.0
Amortization of prior service credit	0.3	0.3	0.1
Amortization of net loss	(1.2)	(1.5)	(1.4)
Other comprehensive (income) loss	$ (5.3)	$ 4.8	$ 5.6

Retirement Benefit Plans - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	Jan. 31, 2018	Jan. 31, 2017
Retirement Benefits [Abstract]
Net prior service credit	$ (3.1)	$ (3.6)
Net actuarial loss	34.8	40.6
Accumulated other comprehensive loss, before tax	$ 31.7	$ 37.0

Retirement Benefit Plans - AOCI Next Fiscal Year (Details) $ in Millions	Jan. 31, 2018 USD ($)
Defined Benefit Plan, Expected Amortization, Next Fiscal Year [Abstract]
Amortization of prior service credit	$ 0.2
Amortization of the net loss	(0.6)
Total amortization	$ (0.4)

Retirement Benefit Plans - Benefit Cost Assumptions (Details)	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Retirement Benefits [Abstract]
Discount rate	2.40%	3.20%	3.20%
Expected long-term rate of return on plan assets	3.30%	4.30%	3.80%
Rate of compensation increase	2.30%	2.20%	2.20%

Retirement Benefit Plans - Benefit Obligation Assumptions (Details)	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Retirement Benefits [Abstract]
Discount rate	1.80%	1.70%	2.20%
Rate of compensation increase	2.60%	2.60%	2.60%

Restructuring charges and other facility exit costs, net (Details) $ in Millions	3 Months Ended	12 Months Ended
	Jan. 31, 2018 USD ($) Position	Jan. 31, 2018 USD ($)	Jan. 31, 2017 USD ($)	Jan. 31, 2018 USD ($)
Restructuring Cost and Reserve [Line Items]
Additions	$ 94.0	$ 94.1	$ 77.8
Restructuring Reserve [Roll Forward]
Total, beginning balance		7.5	0.0
Current portion, beginning balance		5.9	0.0
Non-current portion, beginning balance		1.6	0.0
Additions	94.0	94.1	77.8
Payments		(42.4)	(67.2)
Adjustments		(2.0)	(3.1)
Total, ending balance	57.2	57.2	7.5
Current portion, ending balance	57.2	57.2	5.9
Non-current portion, ending balance	0.0	0.0	1.6
Total	$ 57.2	7.5	7.5	$ 57.2
Fiscal 2018 Plan
Restructuring Cost and Reserve [Line Items]
Percentage of workforce eliminated	13.00%
Number of positions eliminated \| Position	1,150
Facility Closing
Restructuring Cost and Reserve [Line Items]
Additions		0.3	7.4
Lease termination and other exit costs		0.4
Restructuring Reserve [Roll Forward]
Total, beginning balance		4.5	0.0
Additions		0.3	7.4
Payments		(3.0)	(1.8)
Adjustments		(0.3)	(1.1)
Total, ending balance	$ 1.5	1.5	4.5
Total	1.5	4.5	4.5	1.5
Facility Closing \| Fiscal 2018 Plan
Restructuring Cost and Reserve [Line Items]
Additions		6.3
Restructuring Reserve [Roll Forward]
Total, beginning balance		0.0
Additions		6.3
Payments		(1.3)
Adjustments		(2.5)
Total, ending balance	2.5	2.5	0.0
Total	2.5	0.0	0.0	2.5
Facility Closing \| Fiscal 2017 Plan
Restructuring Cost and Reserve [Line Items]
Additions		0.1	7.1
Restructuring Reserve [Roll Forward]
Total, beginning balance		1.9	0.0
Additions		0.1	7.1
Payments		(1.5)	(3.2)
Adjustments		(0.3)	(2.0)
Total, ending balance	0.2	0.2	1.9
Total	0.2	1.9	1.9	0.2
Employee Severance \| Fiscal 2018 Plan
Restructuring Cost and Reserve [Line Items]
Additions		87.3
Restructuring Reserve [Roll Forward]
Total, beginning balance		0.0
Additions		87.3
Payments		(35.1)
Adjustments		0.8
Total, ending balance	53.0	53.0	0.0
Total	53.0	0.0	0.0	53.0
Employee Severance \| Fiscal 2017 Plan
Restructuring Cost and Reserve [Line Items]
Additions		0.1	63.3
Restructuring Reserve [Roll Forward]
Total, beginning balance		1.1	0.0
Additions		0.1	63.3
Payments		(1.5)	(62.2)
Adjustments		0.3	0.0
Total, ending balance	0.0	0.0	1.1
Total	$ 0.0	$ 1.1	$ 1.1	0.0
Minimum
Restructuring Cost and Reserve [Line Items]
Expected restructuring cost				135.0
Minimum \| One-time Termination Benefits
Restructuring Cost and Reserve [Line Items]
Expected restructuring cost				124.0
Minimum \| Facility Closing
Restructuring Cost and Reserve [Line Items]
Expected restructuring cost				11.0
Maximum
Restructuring Cost and Reserve [Line Items]
Expected restructuring cost				149.0
Maximum \| One-time Termination Benefits
Restructuring Cost and Reserve [Line Items]
Expected restructuring cost				137.0
Maximum \| Facility Closing
Restructuring Cost and Reserve [Line Items]
Expected restructuring cost				$ 12.0

Selected Quarterly Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Net revenue	$ 553.8	$ 515.3	$ 501.8	$ 485.7	$ 478.8	$ 489.6	$ 550.7	$ 511.9	$ 2,056.6	$ 2,031.0	$ 2,504.1
Gross profit	480.7	437.8	427.2	407.5	395.9	408.1	465.6	419.5	1,753.2	1,689.1	2,133.4
Loss from operations	(181.9)	(100.0)	(107.6)	(119.6)	(167.1)	(119.9)	(62.9)	(149.7)	(509.1)	(499.6)	1.3
Provision for income taxes	24.8	(8.6)	(17.6)	(8.2)	(5.2)	(13.5)	(25.2)	(14.4)	(9.6)	(58.3)	(310.2)
Net loss	$ (173.5)	$ (119.8)	$ (144.0)	$ (129.6)	$ (173.4)	$ (142.8)	$ (98.2)	$ (167.7)	$ (566.9)	$ (582.1)	$ (330.5)
Basic net loss per share (usd per share)	$ (0.79)	$ (0.55)	$ (0.66)	$ (0.59)	$ (0.78)	$ (0.64)	$ (0.44)	$ (0.75)	$ (2.58)	$ (2.61)	$ (1.46)
Diluted net loss per share (usd per share)	$ (0.79)	$ (0.55)	$ (0.66)	$ (0.59)	$ (0.78)	$ (0.64)	$ (0.44)	$ (0.75)	$ (2.58)	$ (2.61)	$ (1.46)
Loss from operations includes the following items:
Stock-based compensation expense	$ 62.1	$ 65.1	$ 58.8	$ 59.0	$ 59.3	$ 56.6	$ 54.3	$ 51.6	$ 245.0	$ 221.8
Amortization of acquisition related intangibles	8.6	8.7	8.9	10.4	17.3	17.2	18.5	18.8	36.6	71.8
CEO transition costs	(0.2)	0.0	10.6	11.0					21.4
Restructuring charges and other facility exit costs, net	$ 93.9	$ 0.0	$ 0.5	$ (0.3)	$ 9.0	$ 3.2	$ 16.0	$ 52.3	$ 94.1	$ 80.5	$ 0.0

FINANCIAL STATEMENT SCHEDULE II (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the Beginning of Year	$ 1.5	$ 7.6	$ 6.3
Additions Charged to Costs and Expenses or Revenues	2.1	(3.3)	2.3
Deductions and Write-Offs	1.3	2.8	1.0
Balance at End of Year	2.3	1.5	7.6
Partner Program reserves
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the Beginning of Year	28.1	45.2	36.5
Additions Charged to Costs and Expenses or Revenues	224.3	240.3	267.4
Deductions and Write-Offs	215.9	257.4	258.7
Balance at End of Year	36.5	28.1	45.2
Restructuring
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at the Beginning of Year	8.4	1.3	1.6
Additions Charged to Costs and Expenses or Revenues	94.1	77.8	0.0
Deductions and Write-Offs	45.3	70.7	0.3
Balance at End of Year	$ 57.2	$ 8.4	$ 1.3