Document and Entity Information (USD $)	12 Months Ended
Document and Entity Information (USD $)	Jan. 31, 2012	Feb. 29, 2012	Jul. 31, 2011
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, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		227,300,000
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 7,800,000,000

CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Net revenue:
License and other	$ 1,357.6	$ 1,172.1	$ 980.7
Maintenance	858.0	779.7	733.0
Total net revenue	2,215.6	1,951.8	1,713.7
Cost of revenue:
Cost of license and other revenue	187.1	162.2	172.0
Cost of maintenance revenue	42.0	34.4	19.8
Total cost of revenue	229.1	196.6	191.8
Gross profit	1,986.5	1,755.2	1,521.9
Operating expenses:
Marketing and sales	842.6	776.0	731.9
Research and development	566.5	496.2	457.5
General and administrative	223.1	200.8	197.7
Impairment of goodwill	0	0	21.0
Restructuring (benefits) charges	(1.3)	10.8	48.2
Total operating expenses	1,630.9	1,483.8	1,456.3
Income from operations	355.6	271.4	65.6
Interest and other income, net	7.3	0.6	19.1
Income before income taxes	362.9	272.0	84.7
Provision for income taxes	(77.6)	(60.0)	(26.7)
Net income	$ 285.3	$ 212.0	$ 58.0
Basic net income per share	$ 1.25	$ 0.93	$ 0.25
Diluted net income per share	$ 1.22	$ 0.90	$ 0.25
Weighted average shares used in computing basic net income per share	227.7	227.6	228.7
Weighted average shares used in computing diluted net income per share	233.3	234.2	232.1

CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2011
Current assets:
Cash and cash equivalents	$ 1,156.9	$ 1,075.1
Marketable securities	254.4	199.2
Accounts receivable, net	395.1	318.4
Deferred income taxes	30.1	56.8
Prepaid expenses and other current assets	59.4	64.8
Total current assets	1,895.9	1,714.3
Marketable securities	192.8	192.6
Computer equipment, software, furniture and leasehold improvements, net	104.5	84.5
Purchased technologies, net	84.6	57.2
Goodwill	682.4	554.1
Deferred income taxes, net	135.8	90.7
Other assets	131.8	94.2
Assets, Total	3,227.8	2,787.6
Current liabilities:
Accounts payable	89.3	76.8
Accrued compensation	183.9	193.1
Accrued income taxes	14.4	28.6
Deferred revenue	582.3	496.2
Other accrued liabilities	84.2	75.1
Total current liabilities	954.1	869.8
Deferred revenue	136.9	91.7
Long term income taxes payable	174.8	139.1
Other liabilities	79.1	77.7
Commitments and contingencies
Stockholders' equity:
Preferred stock, $0.01 par value; shares authorized 2.0; none issued or outstanding at January 31, 2012 and 2011	0	0
Common stock and additional paid-in capital, $0.01 par value; shares authorized 750.0; --- outstanding at January 31, 2012 and 227.0 outstanding at January 31, 2011	1,365.4	1,267.2
Accumulated other comprehensive income (loss)	5.9	(0.6)
Retained earnings	511.6	342.7
Total stockholders' equity	1,882.9	1,609.3
Liabilities and Equity, Total	$ 3,227.8	$ 2,787.6

BALANCE SHEET (Parentheticals) (USD $)	Jan. 31, 2012	Jan. 31, 2011
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares outstanding	226	227
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	2,000,000	2,000,000
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0

- Definition

Total number of shares of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares represent the ownership interest of the common shareholders. Shares outstanding equals shares issued minus shares held in treasury and other adjustments, if any.

+ References+ Details

- Definition

Face amount or stated value per share of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer); generally not indicative of the fair market value per share.

+ References+ Details

CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Operating activities:
Net income	$ 285.3	$ 212.0	$ 58.0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	115.5	105.4	111.5
Stock-based compensation expense	108.8	80.7	93.6
Excess tax benefits from stock-based compensation	(31.5)	0	0
Impairment of goodwill	0	0	21.0
Restructuring (benefits) charges, net	(1.3)	10.8	48.2
Changes in operating assets and liabilities, net of business combinations:
Accounts receivable	(71.8)	(40.7)	37.3
Deferred income taxes	(33.8)	(2.1)	(13.5)
Prepaid expenses and other current assets	17.7	(12.9)	4.4
Accounts payable and accrued liabilities	2.6	83.7	(80.3)
Deferred revenue	129.6	71.5	(34.0)
Accrued income taxes	52.4	32.4	0.6
Net cash provided by operating activities	573.5	540.8	246.8
Investing activities:
Purchases of marketable securities	(614.2)	(507.2)	(568.9)
Sales of marketable securities	149.5	135.3	26.4
Maturities of marketable securities	409.6	275.4	328.7
Acquisitions, net of cash acquired	(221.7)	(13.5)	(26.1)
Capital expenditures	(63.0)	(28.3)	(31.7)
Other Investing Activites	(30.5)	(4.0)	(11.4)
Net cash used in investing activities	(370.3)	(142.3)	(283.0)
Financing activities:
Proceeds from issuance of common stock, net of issuance costs	176.1	120.9	70.0
Repurchases of common stock	(327.4)	(280.3)	(63.2)
Draws on line of credit	0	0	2.2
Repayments of line of credit	0	0	(54.3)
Excess tax benefits from stock-based compensation	31.5	0	0
Net cash used in financing activities	(119.8)	(159.4)	(45.3)
Effect of exchange rate changes on cash and cash equivalents	(1.6)	(2.7)	2.6
Net increase (decrease) in cash and cash equivalents	81.8	236.4	(78.9)
Cash and cash equivalents at beginning of fiscal year	1,075.1	838.7	917.6
Cash and cash equivalents at end of fiscal year	1,156.9	1,075.1	838.7
Supplemental Cash Flow Information [Abstract]
Net cash paid during the year for income taxes	$ 63.0	$ 32.5	$ 42.1

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) In Millions, except Share data	Total	Common stock and additional paid-in-capital	Comprehensive Income	Accumulated other comprehensive income (loss)	Retained earnings	Total stockholders' equity
Balance at Jan. 31, 2009		$ 1,080.4		$ (11.2)	$ 241.5	$ 1,310.7
Balance (in shares) at Jan. 31, 2009		226,400,000
Common shares issued under stock award and stock purchase plans, Shares		5,200,000		0	0	70,400,000
Common shares issued under stock award and stock purchase plans, Value		70.4
Compensation expense related to stock options		93.6				93.6
Tax benefits from employee stock plans		(3.7)				(3.7)
Net income	58.0		58.0		58.0	58.0
Net loss on derivative instruments, net of taxes			2.5
Change in net unrealized gain on marketable securities, net of tax			1.5
Change in unfunded portion of pension plans			(5.9)
Net change in cumulative foreign currency translation loss			9.6
Other Comprehensive Income (Loss), Net of Tax			7.7	7.7		7.7
Comprehensive Income (Loss), Net of Tax, Attributable to Parent			65.7
Stock Repurchased and Retired During Period, Shares	(2,700,000)	(2,700,000)
Stock Repurchased and Retired During Period, Value		(36.4)			(26.8)	(63.2)
Balances at Jan. 31, 2010		1,204.3		(3.5)	272.7	1,473.5
Balance (in shares) at Jan. 31, 2010		228,900,000
Common shares issued under stock award and stock purchase plans, Shares		7,100,000
Common shares issued under stock award and stock purchase plans, Value		120.9				120.9
Compensation expense related to stock options		80.7				80.7
Tax benefits from employee stock plans		(0.4)				(0.4)
Net income	212.0		212.0		212.0	212.0
Net loss on derivative instruments, net of taxes			(3.1)
Change in net unrealized gain on marketable securities, net of tax			0.9
Change in unfunded portion of pension plans			(3.9)
Net change in cumulative foreign currency translation loss			9.0
Other Comprehensive Income (Loss), Net of Tax			2.9	2.9		2.9
Comprehensive Income (Loss), Net of Tax, Attributable to Parent			214.9
Stock Repurchased and Retired During Period, Shares	(9,000,000)	(9,000,000)
Stock Repurchased and Retired During Period, Value		(138.3)			(142.0)	(280.3)
Balances at Jan. 31, 2011	1,609.3	1,267.2		(0.6)	342.7	1,609.3
Balance (in shares) at Jan. 31, 2011	227	227,000,000
Common shares issued under stock award and stock purchase plans, Shares		8,600,000
Common shares issued under stock award and stock purchase plans, Value		176.1				176.1
Compensation expense related to stock options		108.8				108.8
Tax benefits from employee stock plans		24.3				24.3
Net income	285.3		285.3		285.3	285.3
Net loss on derivative instruments, net of taxes			10.0
Change in net unrealized gain on marketable securities, net of tax			0.2
Change in unfunded portion of pension plans			1.2
Net change in cumulative foreign currency translation loss			(4.9)
Other Comprehensive Income (Loss), Net of Tax			6.5	6.5		6.5
Comprehensive Income (Loss), Net of Tax, Attributable to Parent			291.8
Stock Repurchased and Retired During Period, Shares	(9,700,000)	(9,700,000)
Stock Repurchased and Retired During Period, Value		(211.0)			(116.4)	(327.4)
Balances at Jan. 31, 2012	$ 1,882.9	$ 1,365.4		$ 5.9	$ 511.6	$ 1,882.9
Balance (in shares) at Jan. 31, 2012	226	225,900,000

Business and Summary of Significant Accounting Policies

12 Months Ended

Jan. 31, 2012

Business and Summary Of Significant Accounting Policies

Business and Summary of Significant Accounting Policies

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 and entertainment industries. The Company’s sophisticated software products 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 optimize and improve their designs, help save time and money, improve quality and foster innovation. 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 and majority-owned subsidiaries. All significant intercompany accounts and transactions have been eliminated.

Use of Estimates

The preparation of financial statements in conformity with generally accepted accounting principles 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 goodwill, financial instruments, long-lived assets and other intangible assets, the realizability of deferred tax assets and the fair value of stock awards (see “Stock-Based Compensation Expense” within this Note 1 and Note 3 “Employee and Director Stock Plans,” for further discussion). The Company also make assumptions, judgments and estimates in determining the accruals for uncertain tax positions, variable compensation, partner incentive programs, product returns reserves, allowances for doubtful accounts, asset retirement obligations and legal contingencies.

Foreign Currency Translation

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 weighted average rates during the period. Foreign currency translation adjustments are recorded as other comprehensive income (loss).

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.

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 majority of transaction exposures denominated in euros, Japanese yen, Swiss francs, British pounds, Canadian dollars, and Australian dollars. These instruments have maturities between one to 12 months in the future. Autodesk does not enter into any derivative instruments for trading or speculative purposes.

The bank counterparties in all contracts 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 ratings, credit spreads and potential downgrades on at least a quarterly basis. Based on Autodesk’s on-going assessment of counterparty risk, the Company will adjust its exposure to various counterparties. 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 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

Marketable securities are stated at fair value. Marketable securities maturing within one year that are not restricted are classified as current assets.

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 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.

All of Autodesk’s marketable securities 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. Autodesk did not record any other-than temporary impairment charges during fiscal 2012 and fiscal 2011. 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:



	2012			2011
Trade accounts receivable	$	433.9		$	363.0
Less: Allowance for doubtful accounts	(5.5		)	(4.2		)
Product returns reserve	(5.8		)	(10.6		)
Partner programs and other obligations	(27.5		)	(29.8		)
Accounts receivable, net	$	395.1		$	318.4

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.

The product returns reserves are based on historical experience of actual product returns, estimated channel inventory levels, the timing of new product introductions, channel sell-in for applicable markets and other factors.

Partner program and other obligations are primarily related to partner incentives that use quarterly attainment monetary rewards to motivate distributors and resellers to achieve mutually agreed upon business goals in a specified time period.

Concentration of Credit Risk

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

Geographical concentrations of consolidated cash, cash equivalents and marketable securities held by Autodesk as of January 31:



	2012		2011
United States	11	%	14	%
Other Americas	1	%	1	%
Europe, Middle East and Africa (“EMEA”)	51	%	49	%
Asia Pacific (“APAC”)	37	%	36	%

Autodesk's primary commercial banking relationship is with Citibank and its global affiliates (“Citibank”). The Company's cash and cash equivalents are held by diversified financial institutions globally. Citicorp USA, Inc., an affiliate of Citibank, is one of the lead lenders and agent in the syndicate of Autodesk's $400.0 million line of credit facility.

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 its customers’ 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 17%, 16% and 14% of our net revenue for fiscal years ended 2012, 2011 and 2010, respectively. The majority of the net revenue from sales to Tech Data relates to Autodesk's Platform Solutions and Emerging Business segment and is for sales made outside of the United States. In addition, Tech Data accounted for 21% and 16% of trade accounts receivable at January 31, 2012 and 2011, respectively. In October 2011, Tech Data purchased certain assets of Mensch and Maschine Software (“MuM”), which has been a distributor of our products in Europe. The acquisition concentrates additional sales through Tech Data, which on a consolidated basis would have accounted for 21%, 22% and 21% of our net revenue for fiscal years 2012, 2011 and 2010, if the acquisition had taken place at the beginning of fiscal 2010.

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 $43.7 million in fiscal 2012, $47.6 million in fiscal 2011 and $50.4 million in fiscal 2010.

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



	2012			2011
Computer software, at cost	$	133.5		$	129.4
Computer hardware, at cost	153.3			123.7
Leasehold improvements, land and buildings, at cost	139.5			121.3
Furniture and equipment, at cost	47.7			43.6
	474.0			418.0
Less: Accumulated depreciation	(369.5		)	(333.5		)
Computer software, hardware, leasehold improvements, furniture and equipment, net	$	104.5		$	84.5

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 one year period, if material. Autodesk had no capitalized software development costs at January 31, 2012 and January 31, 2011.

Other Intangible Assets, Net

Other intangible assets include purchased technologies, customer relationships, trade names and the related accumulated amortization. These assets are shown as “Purchased 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 seven years. Amortization expense for purchased technologies, customer relationships, trade names, patents, and user lists was $71.8 million in fiscal 2012, $57.8 million in fiscal 2011 and $61.2 million in fiscal 2010.

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



	2012			2011
Purchased technologies, at cost(1)	$	378.7		$	313.1
Customer relationships, trade names, patents, and user lists, at cost(2)	215.3			179.1
	594.0			492.2
Less: Accumulated amortization	(445.2		)	(373.4		)
Other intangible assets, net	$	148.8		$	118.8

____________________

(1)

Purchased technologies include $1.2 million and zero of in-process research and development technology as of January 31, 2012 and January 31, 2011, respectively. In-process research and development is an indefinite lived asset that is held and tested at least annually for impairment until such time that it becomes fully developed technology. Once development is completed, the technology is amortized to expense over an applicable useful life.


(2)	Included as a net balance in “Other assets” in the Consolidated Balance Sheet. Customer relationships and trade names include the effects of foreign currency translation.

The weighted average amortization period for purchased technologies, customer relationships and trade names during fiscal 2012 was 5.4 years. Expected future amortization expense for purchased technologies, customer relationships and trade names for each of the fiscal years ended thereafter is as follows:



	Year ending January 31,
2013	$	65.7
2014	47.1
2015	25.5
2016	7.9
2017	1.0
Thereafter	1.6
Total	$	148.8

Goodwill

Goodwill consists of the excess of cost over the fair value of net assets acquired in business combinations. Autodesk assigns goodwill to the reportable segment associated with each business combination, and tests goodwill for impairment annually in its fourth fiscal quarter or more often if circumstances indicate a potential impairment. When assessing goodwill for impairment, Autodesk uses discounted cash flow models that include assumptions regarding reportable segments’ projected cash flows (“Income Approach”) and corroborates it with the estimated consideration that the Company would receive if there were to be a sale of the reporting segment (“Market Approach”). Variances in these assumptions could have a significant impact on Autodesk’s conclusion as to whether goodwill is impaired or the amount of any impairment charge. Impairment charges, if any, result from instances where the fair values of net assets associated with goodwill are less than their carrying values. 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) significant slowdown in the worldwide economy or the industries Autodesk serves, or (iv) changes in Autodesk’s business strategy or internal financial results forecasts. There was no impairment of goodwill during the year ended January 31, 2012. A hypothetical 10% decrease in the fair value of Autodesk’s Platform Solutions and Emerging Business; Manufacturing; Architecture, Engineering and Construction; or Media and Entertainment reporting units would not have an impact on the carrying value, nor result in an impairment, of goodwill shown on Autodesk’s balance sheet as of January 31, 2012 for the respective reporting units.

During the fiscal year ended 2010, Autodesk recorded an impairment charge of $21.0 million, representing the entire goodwill balance of the Media and Entertainment (“M&E”) segment as of April 30, 2009. Should revenue and cash flow projections decline significantly in the future, additional impairment charges may be recorded to goodwill.

The change in the carrying amount of goodwill during the year ended January 31, 2012 is as follows:



	Platform Solutions and Emerging Business			Architecture, Engineering and Construction			Manufacturing		Media and Entertainment			Total
Balance as of January 31, 2011
Goodwill	$	45.3		$	224.2		$	279.1	$	154.7		$	703.3
Accumulated impairment losses	—			—			—		(149.2		)	(149.2		)
	45.3			224.2			279.1		5.5			554.1
Scaleform acquisition	—			—			—		22.6			22.6
Blue Ridge acquisition	—			—			22.3		—			22.3
Instructables acquisition	24.4			—			—		—			24.4
Micro Application Packages Limited acquisition	—			12.7			—		—			12.7
T-Splines acquisition	—			—			19.8		—			19.8
Goodwill acquired from other acquisitions	7.6			12.0			2.0		6.7			28.3
Effect of foreign currency translation, purchase accounting adjustments and other	(0.7		)	(1.2		)	0.1		—			(1.8		)
Balance as of January 31, 2012
Goodwill	76.6			247.7			323.3		184.0			831.6
Accumulated impairment losses	—			—			—		(149.2		)	(149.2		)
	$	76.6		$	247.7		$	323.3	$	34.8		$	682.4

The change in the carrying amount of goodwill during the year ended January 31, 2011 is as follows:



	Platform Solutions and Emerging Business		Architecture, Engineering and Construction			Manufacturing		Media and Entertainment			Total
Balance as of January 31, 2010
Goodwill	$	40.2	$	224.8		$	277.9	$	149.2		$	692.1
Accumulated impairment losses	—		—			—		(149.2		)	(149.2		)
	40.2		224.8			277.9		—			542.9
Goodwill acquired during the year	4.6		—			—		5.5			10.1
Effect of foreign currency translation, purchase accounting adjustments and other	0.5		(0.6		)	1.2		—			1.1
Balance as of January 31, 2011
Goodwill	45.3		224.2			279.1		154.7			703.3
Accumulated impairment losses	—		—			—		(149.2		)	(149.2		)
	$	45.3	$	224.2		$	279.1	$	5.5		$	554.1

Purchase accounting adjustments reflect revisions made to the Company’s preliminary purchase price allocation during fiscal 2012 and 2011.

Impairment of Long-Lived Assets

At least annually or more frequently as circumstances dictate, Autodesk assesses the recoverability of its long-lived intangible assets by comparing their carrying amounts to future undiscounted cash flows the assets are expected to generate. If certain identifiable intangibles are considered to be impaired, the impairment to be recognized equals the amount by which the carrying value of the assets exceeds its fair value. There was no impairment of long-lived assets during the years ended January 31, 2012 and 2011.

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, purchased technologies and capitalized intangibles, partially offset by the establishment of U.S. deferred tax liabilities on unremitted earnings from certain foreign subsidiaries, deferred tax liabilities associated with tax method change on advance payments, and a valuation allowance against California and Canadian 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 “more likely than not” expected 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, Autodesk allocates the sales price among each of the deliverables using the residual method, under which revenue is allocated to undelivered elements based on their vendor-specific objective evidence (“VSOE”) of fair value. 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 software license, 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 maintenance or services, the revenue for the arrangement is recognized over the longest contractual service period in the arrangement. Revenue recognition for significant lines of business is discussed further below.

Autodesk’s assessment of likelihood of collection is also a critical element in determining the timing of revenue recognition. If collection is not probable, the revenue will be deferred until the earlier of when collection is deemed probable or cash is received.

License and other revenue are comprised of two components: (1) all forms of product license revenue and (2) other revenue:

(1) All Forms of Product License Revenue

Product license revenue includes: software license revenue from the sale of new seat licenses, upgrades, product revenue for Creative Finishing and revenue from on-demand collaboration software and services. Autodesk’s existing customers who are using a currently supported version of a product can upgrade to the latest release of the product by paying a separate fee at current available prices. An existing customer also has the option to upgrade to a different product, which generally has a higher price, for a premium fee.

Autodesk’s product license revenue from distributors and resellers is generally recognized at the time title to Autodesk’s product passes to the distributor or reseller, provided all other criteria for revenue recognition are met.

Autodesk establishes reserves for product returns based on historical experience of actual product returns, estimated channel inventory levels, the timing of new product introductions, channel sell-in for applicable markets and other factors. These reserves are recorded as a direct reduction of revenue and accounts receivable at the time the related revenue is recognized.

(2) Other Revenue

Other revenue includes revenue from consulting, training, Autodesk Developers Network and Creative Finishing customer support, and is recognized over time, as the services are performed.

Maintenance revenue consists of revenue from the Company’s maintenance program. Under this program, customers are eligible to receive unspecified upgrades when-and-if-available, downloadable training courses and on-line support. Autodesk recognizes maintenance revenue from its maintenance program ratably over the maintenance service contract periods.

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

On the date of grant, Autodesk measures the fair value of all stock-based payments (including grants of stock options, employee stock purchases related to the employee stock purchase plan (“ESP Plan”), and restricted stock) to employees and directors and records the related expense in Autodesk’s Consolidated Statements of Operations. Share-based compensation cost for stock options and employee stock purchases related to the ESP Plan ("stock-based awards") are estimated at the grant date based on the fair-value as calculated using the Black-Scholes-Merton (“BSM”) option-pricing model. Share-based compensation cost for restricted stock is measured based on the closing fair market value of the Company's common stock on the date of grant. The estimated fair value of stock-based awards and restricted stock is amortized to expense on a straight-line basis over the awards’ vesting period. The following table summarizes stock-based compensation expense for fiscal 2012, 2011 and 2010, respectively, as follows:



	Fiscal Year Ended January 31,
	2012			2011			2010
Cost of license and other revenue	$	3.9		$	2.9		$	3.1
Marketing and sales	48.3			35.5			41.1
Research and development	38.1			27.4			30.0
General and administrative	18.5			14.9			19.4
Stock-based compensation expense related to stock awards and ESP Plan purchases	108.8			80.7			93.6
Tax benefit	(27.1		)	(22.0		)	(22.2		)
Stock-based compensation expense related to stock awards and ESP Plan purchases	$	81.7		$	58.7		$	71.4

In fiscal 2010, Autodesk identified errors in the calculation of stock-based compensation expense. The Company had been incorrectly calculating stock-based compensation expense by applying a weighted average forfeiture rate to the vested portion of stock option awards until the grant’s final vest date rather than calculating stock based compensation expense based upon the actual vested portion of the grant date fair value, resulting in an understatement of stock-based compensation expense in certain periods prior to the grant’s vest date. The cumulative error from the understatement of stock-based compensation expense related to the periods prior to fiscal 2010 totaled $6.8 million, net of tax effects. Accordingly, additional expenses of $0.4 million for Cost of license and other revenue, $4.4 million for Marketing and sales, $2.9 million for Research and development, $2.1 million for General and Administrative and $3.0 million for additional tax benefit are included in the stock-based compensation expenses in the table above for the fiscal year ended January 31, 2010.

Autodesk uses the BSM option-pricing model to estimate the fair value of stock-based awards based on the following assumptions:



	Fiscal Year Ended		Fiscal Year Ended		Fiscal Year Ended
	January 31, 2012		January 31, 2011		January 31, 2010
	Stock Option Plans	ESP Plan	Stock Option Plans	ESP Plan	Stock Option Plans	ESP Plan
Range of expected volatilities	40 - 49%	34 - 44%	40 - 45%	33 - 47%	43 - 55%	43 - 73%
Range of expected lives (in years)	2.6 - 4.8	0.5 - 2.0	2.6 - 4.4	0.5 - 2.0	2.7 - 4.0	0.5 - 2.0
Expected dividends	—%	—%	—%	—%	—%	—%
Range of risk-free interest rates	0.5 - 1.9%	0.1 - 0.8%	0.8 - 1.9%	0.2 - 1.1%	1.0 - 2.4%	0.2 - 1.0%
Expected forfeitures	7.8 - 10.5%	7.8 - 10.5%	10.5 - 13.5%	10.5 - 13.5%	13.5%	13.5%

Autodesk estimates expected volatility for stock-based awards based on the average of the following two measures. The first is a measure of historical volatility in the trading market for the Company’s common stock, and the second is the implied volatility of traded forward call options to purchase shares of the Company’s common stock.

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.

Autodesk did not pay cash dividends in fiscal 2012, 2011 or 2010 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.

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

Autodesk only recognizes expense for the stock-based awards that are ultimately expected to vest. Therefore, Autodesk has developed an estimate of the number of awards expected to cancel prior to vesting (“forfeiture rate”). The forfeiture rate is estimated based on historical pre-vest cancellation experience, and is applied to all stock-based awards. The Company estimates forfeitures at the time of grant and revises those estimates in subsequent periods if actual forfeitures differ from those estimates.

Advertising Expenses

Advertising costs are expensed as incurred. Total advertising expenses incurred were $21.3 million in fiscal 2012, $18.8 million in fiscal 2011 and $18.4 million in fiscal 2010.

Net Income Per Share

Basic net income per share is computed based on the weighted average number of shares of common stock outstanding for the period, including restricted stock awards and excluding stock options and restricted stock units. Diluted net 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.

Accounting Standards in Fiscal 2012

With the exception of those discussed below, there have been no recent changes in accounting pronouncements issued by the Financial Accounting Standards Board (“FASB”) or adopted by the Company during the fiscal year ended January 31, 2012, that are of significance, or potential significance, to the Company.

Accounting Standards Adopted

In December 2010, the FASB issued Accounting Standard Update (“ASU”) 2010-29 regarding Accounting Standards Codification (“ASC”) Topic 805 “Business Combinations.” This ASU updates accounting guidance to clarify that pro forma disclosures should be presented as if a business combination occurred at the beginning of the prior annual period for purposes of preparing both the current reporting period and the prior reporting period pro forma financial information. These disclosures should be accompanied by a narrative description about the nature and amount of material, nonrecurring pro forma adjustments. The new accounting guidance was effective for business combinations consummated in periods beginning after December 15, 2010, and should be applied prospectively as of the date of adoption. Autodesk adopted the new disclosures under ASU 2010-29 effective February 1, 2011. The adoption of this ASU did not have an impact on Autodesk's consolidated statements of financial position, results of operations or cash flows. The impact of ASU 2010-29 on Autodesk's future disclosures will be dependent on the size of the business combinations that it consummates in future periods.

In December 2010, the FASB issued ASU 2010-28 regarding ASC Topic 350 “Intangibles - Goodwill and Other.” This ASU updates accounting guidance related to the calculation of the carrying amount of a reporting unit when performing the first step of a goodwill impairment test. More specifically, this update requires an entity to use an equity premise when performing the first step of a goodwill impairment test and if a reporting unit has a zero or negative carrying amount, the entity must assess and consider qualitative factors and whether it is more likely than not that a goodwill impairment exists. The new accounting guidance was effective for public entities, for impairment tests performed during entities' fiscal years (and interim periods within those years) that begin after December 15, 2010. Autodesk adopted the changes under ASU 2010-28 effective February 1, 2011. The adoption of this ASU did not have a material impact on Autodesk's consolidated statements of financial position, results of operations or cash flows.

In January 2010, the FASB issued ASU 2010-06 regarding ASC Topic 820 “Fair Value Measurements and Disclosures.” This ASU requires additional disclosure regarding significant transfers in and out of Levels 1 and 2 fair value measurements and the reasons for the transfers. In addition, this ASU requires the Company to separately present information about purchases, sales, issuances, and settlements (on a gross basis rather than as one net number) in the reconciliation for fair value measurements using significant unobservable inputs (Level 3). ASU 2010-06 clarifies existing disclosures regarding fair value measurement for each class of assets and liabilities and the valuation techniques and inputs used to measure fair value for recurring and nonrecurring fair value measurements that fall in either Level 2 or Level 3. This update also includes conforming amendments to the guidance on employers' disclosures about postretirement benefit plan asset (Subtopic 715-20). The changes under ASU 2010-06 were effective for Autodesk's fiscal year beginning February 1, 2010, except for the disclosures about purchases, sales, issuances and settlements in the roll forward of activity in Level 3 fair value measurements, which Autodesk adopted February 1, 2011. The adoption of this ASU did not have a material impact on Autodesk's consolidated statements of financial position, results of operations or cash flows.

In October 2009, the FASB issued ASU 2009-13 regarding ASC Subtopic 605-25 “Revenue Recognition-Multiple-element Arrangements.” This ASU addresses criteria for separating the consideration in multiple-element arrangements. ASU 2009-13 requires companies to allocate the overall consideration to each deliverable by using a best estimate of the selling price of individual deliverables in the arrangement in the absence of vendor-specific objective evidence or other third-party evidence of the selling price. In October 2009, the FASB also issued ASU 2009-14 regarding ASC Topic 985 “Software: Certain Revenue Arrangements That Include Software Elements.” This ASU modifies the scope of ASC Subtopic 985-605, “Software Revenue Recognition,” to exclude (a) non-software components of tangible products and (b) software components of tangible products that are sold, licensed or leased with tangible products when the software components and non-software components of the tangible product function together to deliver the tangible product's essential functionality. The changes under ASU 2009-13 and 2009-14 were effective prospectively for revenue arrangements entered into or materially modified in fiscal years beginning on or after June 15, 2010. Autodesk adopted the changes under ASU 2009-13 and 2009-14 effective February 1, 2011. The adoption of this ASU did not have a material impact on Autodesk's consolidated statements of financial position, results of operations or cash flows.

Recently Issued Accounting Standards

In December 2011, the FASB issued ASU 2011-11 regarding ASC Topic 210 "Balance Sheet: Disclosure about Offsetting Assets and Liabilities." This ASU requires that entities disclose additional information about offsetting and related arrangements to enable users of the financial statements to understand the effect of those arrangements on the financial position. This ASU will be effective for Autodesk's fiscal year beginning February 1, 2013. Autodesk believes that the adoption of this ASU may impact future disclosures but will not impact its consolidated statements of financial position, results of operations or cash flows.

In September 2011, the FASB issued ASU 2011-08 regarding ASC Topic 350 “Intangibles - Goodwill and Other.” This ASU allows for the option to first assess qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. 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 two-step impairment test is unnecessary. This ASU will be effective for Autodesk's fiscal year beginning February 1, 2012. Autodesk believes that the adoption of this ASU will not have a material impact on its consolidated statements of financial position, results of operations or cash flows.

In June 2011, the FASB issued ASU 2011-05 regarding ASC Topic 220 “Comprehensive Income.” This ASU eliminates the option to present components of other comprehensive income as part of the statement of changes in stockholders' equity and requires the presentation of the total of comprehensive income, the components of net income, and the components of other comprehensive income either in a single continuous statement of comprehensive income or in two separate but consecutive statements. In December 2011, the FASB issued ASU 2011-12 in order to defer new requirements around the presentation of reclassification adjustments on the face of the financial statements between accumulated other comprehensive income and the components of net income and other comprehensive income originally issued in ASU 2011-05. Both ASUs will be effective for Autodesk's fiscal year beginning February 1, 2012. Autodesk currently believes that these new accounting pronouncements will impact the presentation of other comprehensive income but will not impact its consolidated financial position, results of operations or cash flow.

In May 2011, FASB issued ASU 2011-04 regarding ASC Topic 820 “Fair Value Measurement.” This ASU updates accounting guidance to clarify how to measure fair value to align the guidance surrounding Fair Value Measurement within GAAP and International Financial Reporting Standards. In addition, the ASU updates certain requirements for measuring fair value and for disclosure around fair value measurement. It does not require additional fair value measurements and the ASU was not intended to establish valuation standards or affect valuation practices outside of financial reporting. This ASU will be effective for Autodesk's fiscal year beginning February 1, 2012. Early adoption is not permitted. Autodesk believes that the adoption of this ASU will not have a material impact on its consolidated statements of financial position, results of operations or cash flows.

- Definition

The entire disclosure for the organization, consolidation and basis of presentation of financial statements disclosure, and significant accounting policies of the reporting entity. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows. Describes procedure if disclosures are provided in more than one note to the financial statements.

+ References+ Details

Financial Instruments

12 Months Ended

Jan. 31, 2012

Financial Instruments

The following tables summarizes the Company's financial instruments' amortized cost, gross unrealized gains, gross unrealized losses, and fair value by significant investment category as of January 31, 2012 and 2011.



			January 31, 2012
			Amortized Cost		Gross unrealized gains		Gross unrealized losses			Fair Value		Level 1		Level 2		Level 3
Cash equivalents (1):
	Certificates of deposit and time deposits		$	493.6	$	—	$	—		$	493.6	$	11.3	$	482.3	$	—
	Commercial paper		297.9		—		—			297.9		—		297.9		—
	Money market funds		62.1		—		—			62.1		—		62.1		—
Marketable securities:
	Short-term available for sale
		Commercial paper and corporate debt securities	143.7		0.1		—			143.8		35.3		108.5		—
		Certificates of deposit and time deposits	5.2		—		—			5.2		—		5.2		—
		U.S. treasury securities	30.7		—		—			30.7		30.7		—		—
		U.S. government agency securities	38.2		—		—			38.2		38.2		—		—
		Municipal securities	4.7		—		—			4.7		4.7		—		—
		Other	0.3		—		—			0.3		0.3		—		—
	Short-term trading securities
		Mutual funds	29.8		1.8		(0.1		)	31.5		31.5		—		—
	Long-term available for sale
		Corporate debt securities	107.8		1.0		(0.2		)	108.6		108.6		—		—
		U.S. treasury securities	23.6		0.2		—			23.8		23.8		—		—
		U.S. government agency securities	51.4		0.2		—			51.6		51.6		—		—
		Municipal securities	4.6		—		—			4.6		4.6		—		—
		Taxable auction-rate securities	4.2		—		—			4.2		—		—		4.2
Convertible debt securities (2)			18.3		—		—			18.3		—		—		18.3
Derivative contracts (3)			11.6		6.5		(2.2		)	15.9		—		9.7		6.2
		Total	$	1,327.7	$	9.8	$	(2.5	)	$	1,335.0	$	340.6	$	965.7	$	28.7

____________________


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


(2)	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.



			January 31, 2011
			Amortized Cost		Gross unrealized gains		Gross unrealized losses			Fair Value		Level 1		Level 2		Level 3
Cash equivalents (1):
	Certificates of deposit and time deposits		$	383.3	$	—	$	—		$	383.3	$	97.9	$	285.4	$	—
	Commercial paper		331.0		—		—			331.0		—		331.0		—
	Money market funds		43.8		—		—			43.8		—		43.8		—
Marketable securities:
	Short-term available for sale
		Commercial paper and corporate debt securities	47.6		0.1		—			47.7		37.7		10.0		—
		Certificates of deposit and time deposits	29.0		—		—			29.0		25.0		4.0		—
		U.S. treasury securities	26.0		—		—			26.0		26.0		—		—
		U.S. government agency securities	47.2		—		—			47.2		47.2		—		—
		Sovereign debt	9.1		—		—			9.1		—		9.1		—
		Municipal securities	8.6		—		—			8.6		8.6		—		—
		Other	0.3		—		—			0.3		0.3		—		—
	Short-term trading securities
		Mutual funds	29.7		1.7		(0.1		)	31.3		31.3		—		—
	Long-term available for sale
		Corporate debt securities	152.6		1.5		(0.1		)	154.0		154.0		—		—
		U.S. treasury securities	12.7		0.1		—			12.8		12.8		—		—
		U.S. government agency securities	12.7		0.2		—			12.9		12.9		—		—
		Municipal securities	4.7		—		—			4.7		4.7		—		—
		Sovereign debt	3.9		0.1		—			4.0		—		4.0		—
		Taxable auction-rate securities	4.2		—		—			4.2		—		—		4.2
Derivative contracts (2)			3.9		1.9		(1.9		)	3.9		—		3.9		—
		Total	$	1,150.3	$	5.6	$	(2.1	)	$	1,153.8	$	458.4	$	691.2	$	4.2

____________________


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


(2)	Included in “Prepaid expenses and other current assets,” "Other assets," or “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. 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, 2012.

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 auction rate securities, convertible debt securities and derivative contracts which are valued using probability weighted discounted cash flow models and 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 years ended January 31, 2012 and 2011 was as follows:



	Fair Value Measurements Using Significant Unobservable Inputs
	(Level 3)
		Derivative Contracts		Convertible Debt Securities		Money Market Funds			Taxable Auction-Rate Securities			Total
Balance at January 31, 2010		$	—	$	—	$	10.0		$	7.6		$	17.6
Transfers into (out of) Level 3		—		—		—			—			—
Redemptions		—		—		(11.7		)	(3.4		)	(15.1		)
Total realized/unrealized gains (losses) included in earnings		—		—		1.7			—			1.7
Balance at January 31, 2011		—		—		—			4.2			4.2
Purchases		6.2		18.3		—			—			24.5
Transfers into (out of) Level 3		—		—		—			—			—
Redemptions		—		—		—			—			—
Total realized/unrealized gains (losses) included in earnings		—		—		—			—			—
Balance at January 31, 2012		$	6.2	$	18.3	$	—		$	4.2		$	28.7

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



	January 31, 2012
	Cost		Fair Value
Due in 1 year	$	222.8	$	222.9
Due in 1 year through 5 years	205.7		206.9
Due in 5 years through 10 years	—		—
Due after 10 years	4.2		4.2
Total	$	432.7	$	434.0

As of January 31, 2012 and 2011, Autodesk did not have any securities in a continuous unrealized loss position for greater than twelve months.

The sales or redemptions of “available-for-sale securities” in fiscal 2012 and fiscal 2010 resulted in no gains or losses. The sales or redemptions of “available-for-sale securities” for fiscal 2011 resulted in a gain of $1.7 million and no losses. The cost of securities sold is based on the specific identification method. Proceeds from the sale and maturity of marketable securities were $559.1 million in fiscal 2012, $410.7 million in fiscal 2011 and $355.1 million in fiscal 2010.

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 majority of transaction exposures denominated in euros, Japanese yen, Swiss francs, British pounds, Canadian dollars and Australian dollars. These instruments have maturities between one to twelve months in the future. Autodesk does not enter into derivative instrument transactions for trading or speculative purposes.

The bank counterparties in all contracts 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 ratings, credit spreads and potential downgrades on at least a quarterly basis. Based on Autodesk's on-going assessment of counterparty risk, the Company will adjust its exposure to various counterparties. 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.

Foreign currency contracts designated as cash flow hedges

Autodesk utilizes 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 income (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 income (loss)” to “Interest and other income (expense), net” in the Company's Consolidated Financial Statements at that time.

The net notional amount of these contracts was $419.6 million at January 31, 2012 and $345.5 million at January 31, 2011. Balances presented below are presented as net settled. Outstanding contracts are recognized as either assets or liabilities on the balance sheet at fair value. The majority of the net gain of $9.2 million remaining in “Accumulated Other Comprehensive Income (Loss)” as of January 31, 2012 is expected to be recognized into earnings within the next twelve months.

Derivatives not designated as hedging instruments

Autodesk uses foreign currency contracts which are not designated as hedging instruments to reduce the exchange rate risk associated primarily with foreign currency denominated receivables and payables. These forward contracts are marked-to-market at the end of each fiscal quarter with gains and losses recognized as “Interest and other income (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 settlement of the underlying foreign currency denominated receivables and payables. The net notional amounts of these foreign currency contracts were $75.1 million at January 31, 2012 and $56.1 million at January 31, 2011.

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 income as “Interest and other income (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, 2012 and January 31, 2011:



	Balance Sheet Location	Fair Value at
	Balance Sheet Location	January 31, 2012		January 31, 2011
Derivative Assets
Foreign currency contracts designated as cash flow hedges	Prepaid expenses and other current assets	$	11.9	$	5.1
Derivatives not designated as hedging instruments	Other assets	6.2		—
Total derivative assets		$	18.1	$	5.1
Derivative Liabilities
Foreign currency contracts designated as cash flow hedges	Other accrued liabilities	$	2.2	$	1.2
Total derivative liabilities		$	2.2	$	1.2

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, 2012 and 2011, respectively (amounts presented include any income tax effects):



	Foreign Currency Contracts
	Fiscal Year Ended January 31,
	2012			2011
Amount of gain (loss) recognized in accumulated other comprehensive income ("OCI") on derivatives (effective portion)	$	12.8		$	11.8
Amount and Location of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
Net revenue	$	(1.9	)	$	13.0
Operating expenses	4.6			2.1
Total	$	2.7		$	15.1
Amount and Location of Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Interest and other income (expense), net	$	0.3		$	0.1

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, 2012 and 2011, respectively (amounts presented include any income tax effects):



	Foreign Exchange Contracts
	Fiscal Year Ended January 31,
	2012			2011
Amount and Location of Gain (Loss) Recognized in Income on Derivative
Interest and other income, net	$	(1.3	)	$	2.3

Employee and Director Stock Plans

12 Months Ended

Jan. 31, 2012

Notes to Financial Statements [Abstract]

Stock-based Compensation Expense

. Employee and Director Stock Plans

Stock Plans

As of January 31, 2012, Autodesk maintained two active stock option 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 (“2012 Employee Plan”), which is available only to employees, and the Autodesk 2012 Outside Directors’ Plan (“2012 Directors' Plan”), which is available only to non-employee directors. Additionally, there are eight expired or terminated plans with options outstanding. The exercise price of all stock options granted under these plans was equal to the fair market value of the stock on the grant date.

The 2012 Employee Plan was approved by Autodesk's stockholders and became effective on January 6, 2012. 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 21.2 million shares which includes 15.2 million shares reserved upon the effectiveness of 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, 2012, no options or restricted stock have been granted under the 2012 Employee Plan. Options and restricted stock that were granted under the 2008 Stock Plan vest over periods ranging from immediately upon grant to over a four year period and options expire within four to ten years from the date of grant. The 2012 Employee Plan will expire on June 30, 2022. At January 31, 2012, 15.4 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' 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, 2012, no options or restricted stock have been granted under the 2012 Directors' Plan. Options and restricted stock that were granted under the 2010 Outside Directors' Plan vest over periods ranging from one year to over a four year period and options expire within seven years from the date of grant. The 2012 Directors' Plan reserved 2.6 million shares of Autodesk common stock. The 2012 Employee Plan will expire on June 30, 2022. At January 31, 2012, 2.6 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, 2012 is as follows:



	Number of Shares		Weighted average exercise price per share
	(in millions)
Options outstanding at January 31, 2011	30.4		$	28.93
Granted	5.4		40.71
Exercised	(5.3	)	24.85
Canceled	(2.1	)	36.29
Options outstanding at January 31, 2012	28.4		$	31.39
Options exercisable at January 31, 2012	16.7		$	30.98
Options vested and exercisable as of January 31, 2012 and expected to vest thereafter (1)	27.7		$	31.25
Options available for grant at January 31, 2012	18.0

——————

(1) Options expected to vest reflect an estimated forfeiture rate. The weighted average remaining contractual life for these options is 3.9 years and the aggregate intrinsic value is $199.3 million.

As of January 31, 2012, total compensation cost of $74.9 million related to non-vested options is expected to be recognized over a weighted average period of 1.7 years. The following table summarizes information about the pre-tax intrinsic value of options exercised, and the weighted average grant date fair value per share of options granted, during the fiscal years ended January 31, 2012, 2011 and 2010.



	Fiscal year ended January 31,
	2012		2011		2010
Intrinsic value of options exercised (1)	$	85.7	$	61.9	$	18.8
Weighted average grant date fair value per share of stock options granted (2)	$	14.04	$	9.30	$	6.13

——————

(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.

(2) The weighted average grant date fair value per share of stock options granted is calculated, as of the stock option grant date, using the BSM option pricing model.

The following table summarizes information about options outstanding and exercisable at January 31, 2012:



	Options Exercisable						Options Outstanding
	Number of Shares (in millions)	Weighted average contractual life (in years)	Weighted average exercise price per share		Aggregate intrinsic value(1) (in millions)		Number of Shares (in millions)	Weighted average contractual life (in years)	Weighted average exercise price per share		Aggregate intrinsic value(1) (in millions)
Range of per-share exercise prices:
$2.28 - $17.37	3.8		$	12.94			5.8		$	13.61
$17.39 - $29.49	2.6		25.81				6.1		27.64
$29.50 - $37.16	4.4		32.94				6.0		32.72
$37.26 - $41.62	2.0		38.40				5.9		40.46
$42.01 - $49.80	3.9		45.69				4.6		45.42
	16.7	2.1	$	30.98	$	127.7	28.4	4.0	$	31.39	$	201.3

____________________


(1)	Represents the total intrinsic value, based on Autodesk’s closing stock price of $36.00 per share as of January 31, 2012, which would have been received by the option holders had all option holders exercised their options as of that date.

These options will expire if not exercised at specific dates ranging through December 2021.

Restricted Stock:

A summary of restricted stock award and restricted stock unit activity for the fiscal year ended January 31, 2012 is as follows:



	Unreleased Restricted Stock		Weighted average grant date fair value
	(in thousands)
Unreleased restricted stock at January 31, 2011	1,426.8		$	30.43
Granted	1,610.5		37.07
Released	(707.6	)	25.95
Canceled	(145.6	)	32.37
Unreleased restricted stock at January 31, 2012	2,184.1		$	36.65

During the fiscal year ended January 31, 2012, Autodesk granted approximately 1,594.5 thousand restricted stock units. The 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 $29.1 million and $8.9 million during fiscal years ended January 31, 2012 and 2011, respectively. As of January 31, 2012, total compensation cost not yet recognized of $47.7 million related to non-vested awards, is expected to be recognized over a weighted average period of 1.6 years. At January 31, 2012, the number of units granted but unreleased was 2,170.6 thousand.

During the fiscal year ended January 31, 2012, Autodesk granted approximately 16,000 restricted stock awards. Restricted stock awards vest on the date of the next annual meeting. Restricted stock awards are considered outstanding at the time of grant, as the stock award holders are entitled to many of the rights of a stockholder, including voting rights. The fair value of the restricted stock awards is expensed ratably over the vesting period. Autodesk recorded stock-based compensation expense related to restricted stock awards of $0.6 million and $0.7 million during fiscal years ended January 31, 2012 and 2011, respectively. As of January 31, 2011, total compensation cost not yet recognized of $0.2 million related to non-vested awards, is expected to be recognized over a weighted average period of 0.4 years. At January 31, 2012, the number of awards granted but unreleased was 13,500.

1998 Employee Qualified Stock Purchase Plan (“ESP Plan”)

Under Autodesk’s ESP Plan, 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 not less than 85% of fair market value as defined in the ESP Plan. At January 31, 2012, a total of 29.7 million shares were available for future issuance. This amount automatically increases on the first trading day of each fiscal year by an amount equal to the lesser of 10.0 million shares or 2% of the total of (1) outstanding shares plus (2) any shares repurchased by Autodesk during the prior fiscal year. Under the ESP Plan, the Company issues shares on the first trading day following March 31 and September 30 of each fiscal year. The ESP Plan expires during fiscal 2018.

Autodesk issued 2.8 million shares under the ESP Plan at an average price of $18.26 per share in fiscal 2012, 3.2 million shares at an average price of $14.77 per share in fiscal 2011, and 3.1 million shares at an average price of $14.41 per share in fiscal 2010. The weighted average grant date fair value of awards granted under the ESP Plan during fiscal 2012, 2011 and 2010, calculated as of the award grant date using the BSM option pricing model, was $9.95, $10.11 and $7.19 per share, respectively. Autodesk recorded $23.8 million, $18.2 million and $26.6 million of compensation expense associated with the ESP Plan in fiscal 2012, 2011 and 2010, respectively.

Equity Compensation Plan Information

The following table summarizes the number of outstanding options granted to employees and directors, as well as the number of securities remaining available for future issuance under these plans as of January 31, 2012 (number of securities in millions).



	(a)	(b)		(c)
Plan category	Number of securities to be issued upon exercise of outstanding options	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))
Equity compensation plans approved by security holders	30.2	$	29.38	47.7	(1)
Equity compensation plans not approved by security holders(2)	0.4	$	11.03	—
Total	30.6	$	29.15	47.7

____________________


(1)	Included in this amount are 29.7 million securities available for future issuance under Autodesk’s ESP Plan.


(2)	Amounts correspond to Autodesk’s Nonstatutory Stock Option Plan, which was terminated by the Board of Directors in December 2004.

- Definition

The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64, 65, A240

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 93-6

-Paragraph 53

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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-SubTopic 50

-Section 50

-Paragraph 1

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+ Details

Income Taxes

12 Months Ended

Jan. 31, 2012

Income Taxes

The provision for income taxes consists of the following:



	Fiscal year ended January 31,
	2012			2011			2010
Federal:
Current	$	54.3		$	16.0		$	12.3
Deferred	(34.5		)	(8.2		)	(33.0		)
State:
Current	4.9			(1.5		)	3.0
Deferred	1.3			7.4			7.1
Foreign:
Current	55.9			48.4			34.1
Deferred	(4.3		)	(2.1		)	3.2
	$	77.6		$	60.0		$	26.7

During fiscal year 2012, the Company reduced its current federal and state taxes payable by $31.3 million primarily related to excess tax benefits from non-qualified stock options, offsetting additional paid-in capital. Pursuant to accounting standards related to stock-based compensation, the Company has unrecorded excess stock option tax benefits of $150.1 million as of January 31, 2012. These amounts will be credited to additional paid-in-capital when such amounts reduce cash taxes payable. Foreign pretax income was $383.7 million in fiscal 2012, $321.1 million in fiscal 2011, and $253.9 million in fiscal 2010.

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



	Fiscal year ended January 31,
	2012			2011			2010
Income tax provision at U.S. Federal statutory rate	$	127.0		$	95.2		$	29.7
State income tax expense (benefit), net of the U.S. Federal benefit	2.8			1.4			(0.6		)
Foreign income taxed at rates different from the U.S. statutory rate	(61.5		)	(39.7		)	(22.7		)
U.S. valuation allowance	1.7			2.8			14.9
Non-deductible stock-based compensation	12.8			7.9			11.7
Research and development tax credit benefit	(6.0		)	(5.6		)	(4.7		)
Tax benefit from closure of income tax audits and decreases in uncertain tax positions	(0.4		)	(2.8		)	(2.5		)
Officer compensation in excess of $1.0 million	1.9			0.5			0.3
Goodwill impairment	—			—			—
Non-deductible in-process research and development charge	—			—			—
Other	(0.7		)	0.3			0.6
	$	77.6		$	60.0		$	26.7

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



	January 31,
	2012			2011
Nonqualified stock options	$	71.6		$	69.0
Research and development tax credit carryforwards	49.3			64.0
Foreign tax credit carryforwards	0.1			16.6
Accrued compensation and benefits	35.6			33.7
Other accruals not currently deductible for tax	31.1			20.8
Purchased technology and capitalized software	20.6			25.3
Fixed assets	15.9			15.1
Tax loss carryforwards	12.4			6.3
Other	3.7			2.6
Total deferred tax assets	240.3			253.4
Less: valuation allowance	(47.5		)	(42.9		)
Net deferred tax assets	192.8			210.5
Tax method change on advanced payments	(6.3		)	(9.4		)
Unremitted earnings of foreign subsidiaries	(20.6		)	(53.6		)
Total deferred tax liability	(26.9		)	(63.0		)
Net deferred tax assets	$	165.9		$	147.5

The valuation allowance increased by $4.6 million, $3.9 million and $14.3 million in fiscal 2012, 2011 and 2010, respectively. The fiscal 2012, fiscal 2011, and fiscal 2010 changes in valuation allowance were related to California and Canadian deferred taxes. During the first quarter of fiscal 2010, the State of California enacted legislation significantly altering California tax law. As a result of the newly enacted legislation, Autodesk expects that in fiscal years 2012 and beyond, income subject to tax in California will be less than under prior tax law and accordingly, deferred tax assets are less likely to be realized.

No provision has been made for federal income taxes on unremitted earnings of certain Autodesk's foreign subsidiaries (cumulatively $1,290.1 million at January 31, 2012) because Autodesk plans to reinvest such earnings indefinitely. At January 31, 2012, the net unrecognized deferred tax liability for these earnings was approximately $390.9 million.

Realization of the Company's net deferred tax assets of $165.9 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.

As of January 31, 2012, Autodesk had $34.2 million of cumulative federal tax loss carryforwards and $306.9 million of cumulative state tax loss carryforwards, which may be available to reduce future income tax liabilities in certain jurisdictions. These federal and state tax loss carryforwards will expire beginning fiscal 2013 through fiscal 2032 and fiscal 2013 through fiscal 2032, respectively.

As of January 31, 2012, Autodesk had $77.8 million of cumulative federal research tax credit carryforwards, $34.3 million of cumulative California state research tax credit carryforwards and $50.1 million of cumulative Canadian federal tax credit carryforwards, which may be available to reduce future income tax liabilities in the respective jurisdictions. The federal credit carryforwards will expire beginning fiscal 2013 through fiscal 2032, the state credit carryforwards may reduce future California income tax liabilities indefinitely, and the Canadian tax credit carryforwards will expire beginning fiscal 2023 through fiscal 2032. Autodesk also has $60.0 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 2020 through fiscal 2022.

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.

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 2016 and 2019, respectively. with extensions available with incremental business and employment actions. The income tax benefits attributable to the tax status of these business arrangements are estimated to be $10.4 million in fiscal 2012 ($0.046 basic net income per share) and zero in both fiscal 2011 and 2010. The income tax benefits were offset partially by accruals of U.S. income taxes on undistributed earnings, among other factors.

During fiscal 2012, Autodesk recognized income tax expense of $4.4 million related to California taxes, including an increase in the valuation allowance against California deferred taxes. Autodesk also recognized tax benefits of $4.0 million related to changes in estimates as a result of U.S. and foreign tax return filings.

During fiscal 2011, Autodesk recognized income tax expense of approximately $2.1 million primarily related to a change in the expected future tax rates and the increase of a valuation allowance against California deferred taxes of $4.9 million partially offset by the closure of audits and other decreases in uncertain tax positions of $2.8 million.

During fiscal 2010, Autodesk recognized income tax expense of approximately $17.7 million primarily related to a change in the expected future tax rates and the establishment of a valuation allowance against California deferred taxes of $20.2 million partially offset by the closure of audits and other decreases in uncertain tax positions with respect to fiscal 2003 of $2.5 million.

As of January 31, 2012, the Company had $201.1 million of gross unrecognized tax benefits, of which $187.8 million would impact the effective tax rate, if recognized. 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:



	2012			2011			2010
Gross unrecognized tax benefits at the beginning of the fiscal year	$	188.4		$	178.2		$	169.4
Increases for tax positions of prior years	0.4			2.0			3.1
Decreases for tax positions of prior years	(0.4		)	(3.5		)	(1.9		)
Increases for tax positions related to the current year	14.3			13.9			11.1
Decreases for lapse of statute of limitations/audit settlements	(1.6		)	(2.2		)	(3.5		)
Gross unrecognized tax benefits at the end of the fiscal year	$	201.1		$	188.4		$	178.2

It is the Company's continuing practice to recognize interest and/or penalties related to income tax matters in income tax expense. The Company had $2.4 million, $1.9 million and $2.2 million, net of tax benefit, accrued for interest and zero accrued for penalties related to unrecognized tax benefits as of January 31, 2012, 2011 and 2010, respectively.

Autodesk and its subsidiaries are subject to income tax in the United States as well as numerous state and foreign jurisdictions. The Company's U.S. and state income tax returns for fiscal year 2003 through fiscal year 2012 remain open to examination. In addition, the Company files tax returns in multiple foreign taxing jurisdictions with open tax years ranging from fiscal year 2003 to 2012.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph h

-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 136, 172

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 109

-Paragraph 43, 44, 45, 46, 47, 48, 49

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

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+ Details

Acquisitions

12 Months Ended

Jan. 31, 2012

Acquisitions

5. Acquisitions

During the fiscal year ended January 31, 2012, Autodesk completed the business combinations and technology purchases described below. The results of operations for the following acquisitions are included in the accompanying Consolidated Statement of Operations since their respective acquisition date. Pro forma results of operations have not been presented because the effects of the following 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.

On March 1, 2011, Autodesk acquired Scaleform Corporation (“Scaleform”) for total cash consideration of $36.2 million. Scaleform was a privately held middleware and user interface tools company, whose technology has been licensed in the development of games across all major hardware platforms. Scaleform has been integrated into, and the related goodwill was assigned to Autodesk's Media and Entertainment segment.

On March 10, 2011, Autodesk acquired Blue Ridge Numerics, Inc. (“Blue Ridge”) for total cash consideration of $41.2 million. Blue Ridge was a privately held company that designed and sold software that enables mechanical engineers to study fluid flow and thermal performance in virtual prototyping. Blue Ridge has been integrated into, and the related goodwill was assigned to Autodesk's Manufacturing segment.

On August 1, 2011, Autodesk acquired Instructables, Inc. (“Instructables”) for total cash consideration of $30.2 million. Instructables was a privately held web-based company specializing in user-created and uploaded instructions for do-it-yourself projects, on which other users can comment and rate for quality. Instructables has been integrated into, and the related goodwill was assigned to Autodesk's Platform Solutions and Emerging Business segment.

On August 24, 2011, Autodesk entered into a purchase agreement with Turbo Squid, Inc. (“Turbo Squid”) to acquire certain technology related assets for $26.0 million and entered into related cross-licensing and a commercial arrangement which is less than $0.2 million in expense per year. Additionally, Autodesk purchased the option to acquire Turbo Squid within a prescribed date range.

On October 14, 2011, Autodesk acquired Micro Application Packages Limited (“MAP”) for total cash consideration of $23.0 million. MAP was a privately held company specializing in software and services in the building information modeling (“BIM”) life cycle with the focus on fabrication. MAP has been integrated into, and the related goodwill was assigned to Autodesk's Architecture, Engineering and Construction segment.

On December 21, 2011, Autodesk acquired certain technology-related assets of T-Splines, Inc. ("T-Splines") for total cash consideration of $23.0 million. T-Splines is a privately-held company, that develops surface modeling software for industrial designers and CAD professionals. The assets of T-Splines have been integrated into, and the related goodwill was assigned to Autodesk's Manufacturing segment.

During the fiscal year ended January 31, 2012, Autodesk also completed 17 other business combination and technology acquisitions for a total cash consideration of approximately $54.8 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, 2012:



	Scaleform			Blue Ridge			Instructables			MAP			Turbo Squid		T-Splines		Other
Developed technologies	$	5.9		$	6.0		$	0.4		$	2.5		$	26.0	$	2.1	$	21.7
Customer relationships	4.4			9.2			0.2			2.0			—		0.7		3.9
Trade name	1.4			1.1			1.6			0.9			—		0.4		1.2
User List	—			—			5.1			—			—		—		—
Patent	3.6			—			—			—			—		—		—
In-process research and development	0.6			0.6			—			—			—		—		—
Goodwill	22.6			22.3			24.4			12.7			—		19.8		28.3
Deferred Revenue	—			(1.2		)	—			—			—		—		—
Deferred tax asset (liability)	(2.5		)	(3.6		)	(1.6		)	(1.6		)	—		—		0.2
Net tangible assets (liabilities)	0.2			6.8			0.1			6.5			—		—		(0.5		)
Total	$	36.2		$	41.2		$	30.2		$	23.0		$	26.0	$	23.0	$	54.8

For Instructables and MAP the allocation of purchase price consideration to the assets and liabilities is not yet finalized. The allocation of the purchase price consideration was based upon a preliminary valuation and our estimates and assumptions are subject to change within the measurement period (up to one year from the acquisition date). The primary areas of the preliminary purchase price allocation that are not yet finalized are amounts for income tax assets and liabilities, pending finalization of estimates and assumptions in respect of certain tax aspects of the transaction and residual goodwill.

During the fiscal year ended January 31, 2011, the Company acquired two entities, neither of which were individually material, for total consideration of $13.5 million.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

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+ Details

Deferred Compensation	12 Months Ended
Deferred Compensation	Jan. 31, 2012
Deferred Compensation Liability [Abstract]
Deferred Compensation	Deferred Compensation At January 31, 2012, Autodesk had marketable securities totaling $447.2 million, of which $31.5 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 $31.5 million at January 31, 2012, of which $3.2 million was classified as current and $28.3 million was classified as non-current liabilities. The value of debt and equity securities held in the rabbi trust at January 31, 2011 was $31.3 million. The total related deferred compensation liability at January 31, 2011 was $31.3 million, of which $3.4 million was classified as current and $27.9 million was classified as non-current liabilities. The current and non-current portions of the liability are recorded in the Consolidated Balance Sheets under “Accrued compensation” and “Other liabilities,” respectively.

- Definition

The entire disclosure for compensation costs, including compensated absences accruals, compensated absences liability, deferred compensation arrangements and income statement compensation items. Deferred compensation arrangements may include a description of an arrangement with an individual employee, which is generally an employment contract between the entity and a selected officer or key employee containing a promise by the employer to pay certain amounts at designated future dates, usually including a period after retirement, upon compliance with stipulated requirements. This type of arrangement is distinguished from broader based employee benefit plans as it is usually tailored to the employee. Disclosure also typically includes the amount of related compensation expense recognized during the reporting period, the number of shares (units) issued during the period under such arrangements, and the carrying amount as of the balance sheet date of the related liability.

+ References+ Details

Borrowing Arrangements

12 Months Ended

Jan. 31, 2012

Borrowing Arrangements

During the fiscal year ended January 31, 2012, Autodesk entered into a credit agreement that provides for a $400.0 million unsecured revolving credit facility, with an option to request an increase in the amount of the credit facility by up to an additional $100.0 million. In connection with the execution of this new credit agreement, Autodesk terminated a $250.0 million U.S. line of credit facility on May 26, 2011 that would have expired in August 2012. The new 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. At January 31, 2012 and January 31, 2011, Autodesk had no outstanding borrowings on either its prior or current line of credit. The new facility expires in May 2016.

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References+ Details

Commitments and Contingencies

12 Months Ended

Jan. 31, 2012

Commitments and Contingencies

Lease commitments

Autodesk leases office space and computer equipment under non-cancellable operating lease agreements that expire at various dates through 2023. 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, 2012, the aggregate future minimum lease payments required were as follows:




2013	$	50.8
2014	41.4
2015	34.9
2016	30.0
2017	23.9
Thereafter	59.9
	240.9
Less: Sublease income	3.3
	$	237.6

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,
	2012		2011		2010
Rent expense	$	53.0	$	52.1	$	56.8

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, 2012 were approximately $53.5 million for periods through fiscal 2015. These purchase commitments primarily result from contracts for the acquisition of IT infrastructure, marketing and software development services.

Autodesk has certain royalty commitments associated with the shipment and licensing of certain products. Royalty expense is generally based on a dollar amount per unit shipped or a percentage of the underlying revenue. Royalty expense, which was recorded under cost of license and other revenue on Autodesk’s Consolidated Statements of Operations, was $16.5 million in fiscal 2012, $12.8 million in fiscal 2011 and $16.5 million in fiscal 2010.

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. 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.

- Definition

The entire disclosure for commitments and contingencies.

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+ Details

Stockholders Equity	12 Months Ended
Stockholders Equity	Jan. 31, 2012
Stockholders' Equity Attributable to Parent [Abstract]
Stockholders' Equity Note	Stockholders' Equity Preferred Stock Under Autodesk’s Certificate of Incorporation, 2.0 million shares of preferred stock are authorized. At January 31, 2012, 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 Programs Autodesk has a stock repurchase program that is used largely to help offset the 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, and has the effect of returning excess cash generated from the Company's business to stockholders. During fiscal 2012, Autodesk repurchased and retired 9.7 million shares at an average repurchase price of $33.71 per share, 9.0 million shares in fiscal 2011 at an average repurchase price of $31.13 per share and 2.7 million shares in fiscal 2010 at an average repurchase price of $23.63. Common stock and additional paid-in capital and retained earnings were reduced by $211.0 million and $116.4 million, respectively for the year ended January 31, 2012 and $138.3 million and $142.0 million, respectively, for the year ended January 31, 2011, as a result of the stock repurchases. At January 31, 2012, 14.7 million shares remained available for repurchase under repurchase plans approved by the Board of Directors. In fiscal 2012, 2011 and 2010, Autodesk repurchased its common stock through open market purchases. The number of shares acquired and the timing of the purchases are based on several factors, including general market conditions, the number of employee stock option exercises, stock issuance, the trading price of Autodesk common stock, cash on hand and available in the United States, and company defined trading windows.

- Definition

The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

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+ Details

Accumulated Other Comprehensive Income , Net of Taxes

12 Months Ended

Jan. 31, 2012

Accumulated Other Comprehensive Income (loss) [Abstract]

Accumulated Other Comprehensive Income (loss)

Accumulated Other Comprehensive Income (Loss)

Accumulated other comprehensive income (loss), net of taxes, was comprised of the following at January 31:



	January 31,
	2012			2011			2010
Net gain (loss) on derivative instruments	$	9.2		$	(0.8	)	$	2.3
Net unrealized gain on available-for-sale securities	2.6			2.4			1.5
Unfunded portion of pension plans	(8.6		)	(9.8		)	(5.9		)
Foreign currency translation adjustments	2.7			7.6			(1.4		)
Accumulated other comprehensive income (loss)	$	5.9		$	(0.6	)	$	(3.5	)

- Definition

The entire disclosure for comprehensive income. Includes, but is not limited to, the following: 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. Components of comprehensive income include: (1) foreign currency translation adjustments; (2) gains (losses) on foreign currency transactions that are designated as, and are effective as, economic hedges of a net investment in a foreign entity; (3) gains (losses) on intercompany foreign currency transactions that are of a long-term-investment nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; (4) change in the market value of a futures contract that qualifies as a hedge of an asset reported at fair value; (5) unrealized holding gains (losses) on available-for-sale securities and that resulting from transfers of debt securities from the held-to-maturity category to the available-for-sale category; (6) a net loss recognized as an additional pension liability not yet recognized as net periodic pension cost; and (7) the net gain (loss) and net prior service cost or credit for pension plans and other postretirement benefit plans.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 14-26

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Paragraph 1

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-Name Accounting Standards Codification

-Glossary Reclassification Adjustments

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+ Details

Net Income Per Share

12 Months Ended

Jan. 31, 2012

Net Income Per Share

Basic net income per share is computed using the weighted average number of shares of common stock outstanding for the period, including restricted stock awards and excluding stock options and restricted stock units. Diluted net income per share is based upon the weighted average 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 income per share amounts:



	Fiscal Year Ended January 31,
	2012		2011		2010
Numerator:
Net income	$	285.3	$	212.0	$	58.0
Denominator:
Denominator for basic net income per share—weighted average shares	227.7		227.6		228.7
Effect of dilutive securities	5.6		6.6		3.4
Denominator for dilutive net income per share	233.3		234.2		232.1
Basic net income per share	$	1.25	$	0.93	$	0.25
Diluted net income per share	$	1.22	$	0.90	$	0.25

The computation of diluted net income 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. For the fiscal years ended January 31, 2012, 2011 and 2010, 12.9 million, 19.3 million and 21.3 million potentially anti-dilutive shares, respectively, were excluded from the computation of net income per share.

- Definition

The entire disclosure for earnings per share.

+ References+ Details

Segments

12 Months Ended

Jan. 31, 2012

Segments

Autodesk reports segment information based on the “management” approach. The management approach designates the internal reporting used by management for making decisions and assessing performance as the source of the Company’s reportable segments. Autodesk has four reportable segments: Platform Solutions and Emerging Business (“PSEB”), Architecture, Engineering and Construction (“AEC”), Manufacturing (“MFG”) and Media and Entertainment (“M&E”). Location Services, which Autodesk disposed of in February 2009, is not included in any of the above reportable segments, and is reflected as Other. Autodesk has no material inter-segment revenue.

The PSEB, AEC and MFG segments derive revenue from the sale of licenses for software products and services to customers who design, build, manage or own building, manufacturing and infrastructure projects. Our M&E segment derives revenue from the sale of products to creative professionals, post-production facilities and broadcasters for a variety of applications, including feature films, television programs, commercials, music and corporate videos, interactive game production, web design and interactive web streaming.

PSEB includes Autodesk’s design product, AutoCAD. Autodesk’s AutoCAD product is a platform product that underpins the Company’s design product offerings for the industries it serves. For example, AEC and MFG offer tailored versions of AutoCAD software for the industries they serve. Autodesk’s AutoCAD product also provides a platform for Autodesk’s developer partners to build custom solutions for a range of diverse design-oriented markets. PSEB’s revenue primarily includes revenue from sales of licenses of Autodesk’s design products, AutoCAD and AutoCAD LT, as well as the Autodesk Design Suite and many other design products.

AEC software products help to improve the way building, civil infrastructure, process plant and construction projects are designed, built and managed. A broad portfolio of solutions enables greater efficiency, accuracy and sustainability across the entire project lifecycle. Autodesk AEC solutions include advanced technology for building information modeling (“BIM”), AutoCAD-based design and documentation productivity software, sustainable design analysis applications, and collaborative project management solutions. BIM, an integrated process for building and infrastructure design, analysis, documentation and construction, uses consistent, coordination information to improve communication and collaboration between the extended project team. AEC provides a comprehensive portfolio of BIM solutions that help customers deliver projects faster and more economically, while minimizing environmental impact. AEC’s revenue primarily includes revenue from the sales of licenses of Autodesk Revit family suites, AutoCAD Civil 3D, AutoCAD Architecture and AutoCAD Map 3D products.

MFG provides the manufacturers in automotive and transportation, industrial machinery, consumer products and building products with comprehensive digital prototyping solutions that brings together design data from all phases of the product development process to develop a single digital model created in Autodesk Inventor software. Autodesk’s solutions for digital prototyping enable a broad group of manufacturers to realize benefits with minimal disruption to existing workflows. MFG’s revenue primarily includes revenue from the sales of licenses of Autodesk Inventor family suites, AutoCAD Mechanical and Autodesk Moldflow products.

M&E is comprised of two product groups: Animation, including design visualization, and Creative Finishing. Animation products, such as Autodesk 3ds Max, Autodesk Maya and the Autodesk Entertainment Creation Suite, provide tools for digital sculpting, modeling, animation, effects, rendering and compositing, for design visualization, visual effects and games production. Creative Finishing products provide editing, finishing and visual effects design and color grading.

All of Autodesk’s reportable segments distribute their respective products primarily through authorized resellers and distributors and, to a lesser extent, through direct sales to end-users.

The accounting policies of the reportable segments are the same as those described in Note 1, “Business and Summary of Significant Accounting Policies.” Autodesk evaluates each segment’s performance on the basis of gross profit. Autodesk currently does not separately accumulate and report asset information by segment, except for goodwill, which is disclosed in Note 1, “Business and Summary of Significant Accounting Policies.”

Information concerning the operations of Autodesk’s reportable segments is as follows:



	Fiscal year ended January 31,
	2012			2011			2010
Net revenue:
Platform Solutions and Emerging Business	$	833.1		$	716.2		$	624.0
Architecture, Engineering and Construction	626.4			568.0			513.3
Manufacturing	540.3			470.0			386.9
Media and Entertainment	215.8			197.6			189.1
Other(1)	—			—			0.4
	$	2,215.6		$	1,951.8		$	1,713.7
Gross profit:
Platform Solutions and Emerging Business	$	788.0		$	678.9		$	589.7
Architecture, Engineering and Construction	569.7			517.6			465.2
Manufacturing	496.1			439.5			358.4
Media and Entertainment	174.6			153.9			144.4
Unallocated(2)	(41.9		)	(34.7		)	(35.8		)
	$	1,986.5		$	1,755.2		$	1,521.9
Depreciation and amortization:
Platform Solutions and Emerging Business	$	1.8		$	3.0		$	3.1
Architecture, Engineering and Construction	0.7			1.6			1.8
Manufacturing	1.7			2.3			2.5
Media and Entertainment	0.5			1.1			1.8
Unallocated	110.8			97.4			102.3
	$	115.5		$	105.4		$	111.5

____________________


(1)	Other primarily consisted of revenue from Autodesk’s Location Services division, which Autodesk disposed of in February 2009.


(2)	Unallocated amounts primarily relate to corporate expenses and other costs and expenses that are managed outside the reportable segments, including stock-based compensation expense.

Information regarding Autodesk’s operations by geographic area is as follows:



	Fiscal year ended January 31,
	2012		2011		2010
Net revenue:
Americas
U.S.	$	631.0	$	561.6	$	527.5
Other Americas	167.5		139.9		126.9
Total Americas	798.5		701.5		654.4
Europe, Middle East and Africa	862.2		782.8		671.1
Asia Pacific
Japan	240.5		200.6		171.1
Other Asia Pacific	314.4		266.9		217.1
Total Asia Pacific	554.9		467.5		388.2
Total net revenue	$	2,215.6	$	1,951.8	$	1,713.7



	January 31,
	2012		2011
Long-lived assets(1):
Americas
U.S.	$	792.5	$	571.2
Other Americas	39.2		65.6
Total Americas	831.7		636.8
Europe, Middle East and Africa
Switzerland	37.7		42.8
Other Europe, Middle East and Africa	83.4		68.5
Total Europe, Middle East and Africa	121.1		111.3
Asia Pacific	50.5		41.9
Total long-lived assets	$	1,003.3	$	790.0

____________________


(1)	Long-lived assets exclude investments in subsidiaries, deferred tax assets and marketable securities.

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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+ Details

Retirement Benefit Plans	12 Months Ended
Retirement Benefit Plans	Jan. 31, 2012
Retirement Benefit Plans [Abstract]
Pension and Other Postretirement Benefits Disclosure	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 50% 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 $7.3 million in fiscal 2012, $6.7 million in fiscal 2011 and $7.1 million in fiscal 2010. Autodesk does not allow participants to invest in Autodesk common stock through the 401(k) plan. Other Plans Autodesk provides certain defined benefit pension plans to employees primarily located in countries outside of the U.S. The Company deposits funds for specific plans, consistent with the requirements of local law, with insurance companies or third-party trustees, and accrues for the unfunded portion of the obligation, where material. The assumptions used in calculating the obligation for these plans depend on the local economic environment. The net liability related to the funded status of the plans was approximately $18.0 million and $18.2 million as of January 31, 2012 and 2011, respectively. The projected benefit obligation was $52.8 million and $47.3 million as of January 31, 2012 and 2011, respectively. The related fair value of plan assets was $34.8 million and $29.1 million as of January 31, 2012 and 2011, respectively. Our practice is to fund the pension plans in amounts at least sufficient to meet the minimum requirements of local laws and regulations. The assets of the plans are primarily invested in high quality fixed income investments. Our contributions were approximately $4.2 million, $3.5 million and $3.4 million in fiscal 2012, 2011 and 2010, respectively. As of January 31, 2012, our estimated future benefit payments are an aggregate $10.2 million for fiscal 2013 through fiscal 2017 and an aggregate of $7.9 million for fiscal 2018 through fiscal 2022. Autodesk recorded $8.2 million and $9.8 million of unrealized changes in the unfunded portion of Autodesk’s defined benefit plans in fiscal 2012 and fiscal 2011, respectively. 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 $20.4 million in fiscal 2012, $13.6 million in fiscal 2011 and $13.4 million in fiscal 2010. 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.

- Definition

The entire disclosure for pension and other postretirement benefits.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Implementation Guide (Q and A)

-Number FAS88

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+ Details

Restructuring Reserve

12 Months Ended

Jan. 31, 2012

Notes to Financial Statements [Abstract]

Restructuring Reserve

Restructuring Reserves

During fiscal 2011, 2010 and 2009 Autodesk initiated restructuring plans (“Fiscal 2011 Plan,” “Fiscal 2010 Plan” and “Fiscal 2009 Plan,” respectively) in order to further reduce operating costs. These restructuring plans resulted in targeted global staff reductions of approximately 200, 430, and 700 positions in fiscal 2011, 2010 and 2009, respectively. No leased facilities were consolidated as part of the Fiscal 2011 Plan. The Fiscal 2010 Plan and Fiscal 2009 Plan resulted in the consolidation of 32 and 27 leased facilities, respectively. In connection with our restructuring plans, we recorded a favorable adjustment for changes in previous estimates during fiscal 2012.

The following table sets forth the restructuring activities for the fiscal years ended January 31, 2012 and 2011.



	Balances, January 31, 2011		Additions		Payments			Adjustments(1)			Balances, January 31, 2012
Fiscal 2011 Plan
Employee termination costs	$	1.5	$	—	$	(1.5	)	$	—		$	—
Fiscal 2010 Plan
Employee termination costs	—		—								—
Lease termination and asset costs	1.7		—		(1.1		)	(0.3		)	0.3
Fiscal 2009 Plan
Employee termination costs	—		—		—			—			—
Lease termination and asset costs	2.8		—		(0.9		)	(1.3		)	0.6
Other
Employee termination costs	—		—		—			—			—
Lease termination costs	2.6		—		(0.8		)	(0.3		)	1.5
Total	$	8.6	$	—	$	(4.3	)	$	(1.9	)	$	2.4
Current portion(2)	$	4.8									$	1.1
Non-current portion(2)	3.8										1.3
Total	$	8.6									$	2.4

____________________


(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.



	Balances, January 31, 2010		Additions		Payments			Adjustments(1)			Balances, January 31, 2011
Fiscal 2011 Plan
Employee termination costs	$	—	$	12.4	$	(10.6	)	$	(0.3	)	$	1.5
Fiscal 2010 Plan
Employee termination costs	0.8		—		(0.8		)	—			—
Lease termination and asset costs	6.1		0.3		(4.3		)	(0.4		)	1.7
Fiscal 2009 Plan
Employee termination costs	1.0		—		(0.2		)	(0.8		)	—
Lease termination and asset costs	8.2		1.0		(4.6		)	(1.8		)	2.8
Other
Employee termination costs	0.4		—		(0.3		)	(0.1		)	—
Lease termination costs	2.9		—		(0.2		)	(0.1		)	2.6
Total	$	19.4	$	13.7	$	(21.0	)	$	(3.5	)	$	8.6
Current portion(2)	$	11.4									$	4.8
Non-current portion(2)	8.0										3.8
Total	$	19.4									$	8.6

____________________


(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.

- Definition

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

+ References+ Details

Selected Quarterly Financial Information

12 Months Ended

Jan. 31, 2012

Selected Quarterly Financial Information (Unaudited) [Abstract]

Quarterly Financial Information

Selected Quarterly Financial Information (Unaudited)

Summarized quarterly financial information for fiscal 2012 and 2011 is as follows:



2012	1st quarter			2nd quarter			3rd quarter			4th quarter			Fiscal year
Net revenue	$	528.3		$	546.3		$	548.6		$	592.4		$	2,215.6
Gross profit	473.7			488.9			489.0			534.9			1,986.5
Income from operations	78.6			95.0			90.2			91.8			355.6
Provision for income taxes	(15.2		)	(23.0		)	(18.5		)	(20.9		)	(77.6		)
Net income	69.3			71.2			72.8			72.0			285.3
Basic net income per share	$	0.30		$	0.31		$	0.32		$	0.32		$	1.25
Diluted net income per share	$	0.29		$	0.30		$	0.32		$	0.31		$	1.22
Income from operations includes the following items:
Stock-based compensation expense	$	25.9		$	27.3		$	25.6		$	30.0		$	108.8
Amortization of acquisition related intangibles	14.6			17.8			19.3			18.6			70.3
Restructuring benefits	—			(1.3		)	—			—			(1.3		)

2011	1st quarter			2nd quarter			3rd quarter			4th quarter			Fiscal year
Net revenue	$	474.6		$	472.8		$	476.7		$	527.7		$	1,951.8
Gross profit	423.3			424.4			428.2			479.3			1,755.2
Income from operations	50.8			79.8			69.2			71.6			271.4
Provision for income taxes	(10.5		)	(20.0		)	(18.1		)	(11.4		)	(60.0		)
Net income	36.9			59.9			53.6			61.6			212.0
Basic net income per share	$	0.16		$	0.26		$	0.24		$	0.27		$	0.93
Diluted net income per share	$	0.16		$	0.25		$	0.23		$	0.26		$	0.90
Income from operations includes the following items:
Stock-based compensation expense	$	24.3		$	21.0		$	17.0		$	18.4		$	80.7
Amortization of acquisition related intangibles	13.9			13.6			14.1			14.3			55.9
Restructuring charges	7.1			1.9			—			1.8			10.8

- Definition

The entire disclosure for the quarterly financial data in the annual financial statements. The disclosure may include a tabular presentation of financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income or loss before extraordinary items and earnings per share data. It also includes an indication if the information in the note is unaudited, comments on the aggregate effect of year-end adjustments, and an explanation of matters or transactions that affect comparability or are pertinent to an understanding of the information furnished.

+ References+ Details

SCHEDULE II

12 Months Ended

Jan. 31, 2012

Financial Statement Schedule II

FINANCIAL STATEMENT SCHEDULE II



Description	Balance at Beginning of Year		Additions Charged to Costs and Expenses or Revenues			Deductions and Write-Offs		Balance at End of Year
	(in millions)
Fiscal Year ended January 31, 2012
Allowance for doubtful accounts	$	4.2	$	2.4		$	1.1	$	5.5
Product returns reserves	10.6		32.7			37.5		5.8
Restructuring	8.6		—			6.2		2.4
Fiscal Year ended January 31, 2011
Allowance for doubtful accounts	$	4.6	$	(0.3	)	$	0.1	$	4.2
Product returns reserves	11.8		38.9			40.1		10.6
Restructuring	19.4		13.7			24.5		8.6
Fiscal Year ended January 31, 2010
Allowance for doubtful accounts	$	8.6	$	1.7		$	5.7	$	4.6
Product returns reserves	12.5		42.9			43.6		11.8
Restructuring	43.9		48.9			73.4		19.4

Business and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Jan. 31, 2012

Business and Summary of Significant Accounting Policies [Abstract]

Business, Policy

Business

Principles of Consolidation, Policy

Principles of Consolidation

Use of Estimates, Policy

Use of Estimates

Foreign Currency Translation Policy

Foreign Currency Translation

Derivatives, Policy

Derivative Financial Instruments

Cash and Cash Equivalents, Policy

Cash and Cash Equivalents

Marketable Securities, Policy

Marketable Securities

Marketable securities are stated at fair value. Marketable securities maturing within one year that are not restricted are classified as current assets.

Accounts Receivable, Net, Policy

Accounts Receivable, Net

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



	2012			2011
Trade accounts receivable	$	433.9		$	363.0
Less: Allowance for doubtful accounts	(5.5		)	(4.2		)
Product returns reserve	(5.8		)	(10.6		)
Partner programs and other obligations	(27.5		)	(29.8		)
Accounts receivable, net	$	395.1		$	318.4

Concentration of Credit Risk, Policy

Concentration of Credit Risk

Geographical concentrations of consolidated cash, cash equivalents and marketable securities held by Autodesk as of January 31:



	2012		2011
United States	11	%	14	%
Other Americas	1	%	1	%
Europe, Middle East and Africa (“EMEA”)	51	%	49	%
Asia Pacific (“APAC”)	37	%	36	%

Computer Equipment, Software, Furniture and Leasehold Improvements, Net, Policy

Computer Equipment, Software, Furniture and Leasehold Improvements, Net

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



	2012			2011
Computer software, at cost	$	133.5		$	129.4
Computer hardware, at cost	153.3			123.7
Leasehold improvements, land and buildings, at cost	139.5			121.3
Furniture and equipment, at cost	47.7			43.6
	474.0			418.0
Less: Accumulated depreciation	(369.5		)	(333.5		)
Computer software, hardware, leasehold improvements, furniture and equipment, net	$	104.5		$	84.5

Software Development Costs, Policy

Software Development Costs

Other Intangible Assets, Policy

Expected future amortization expense for purchased technologies, customer relationships and trade names for each of the fiscal years ended thereafter is as follows:



	Year ending January 31,
2013	$	65.7
2014	47.1
2015	25.5
2016	7.9
2017	1.0
Thereafter	1.6
Total	$	148.8

Goodwill, Policy

Goodwill

The change in the carrying amount of goodwill during the year ended January 31, 2012 is as follows:



	Platform Solutions and Emerging Business			Architecture, Engineering and Construction			Manufacturing		Media and Entertainment			Total
Balance as of January 31, 2011
Goodwill	$	45.3		$	224.2		$	279.1	$	154.7		$	703.3
Accumulated impairment losses	—			—			—		(149.2		)	(149.2		)
	45.3			224.2			279.1		5.5			554.1
Scaleform acquisition	—			—			—		22.6			22.6
Blue Ridge acquisition	—			—			22.3		—			22.3
Instructables acquisition	24.4			—			—		—			24.4
Micro Application Packages Limited acquisition	—			12.7			—		—			12.7
T-Splines acquisition	—			—			19.8		—			19.8
Goodwill acquired from other acquisitions	7.6			12.0			2.0		6.7			28.3
Effect of foreign currency translation, purchase accounting adjustments and other	(0.7		)	(1.2		)	0.1		—			(1.8		)
Balance as of January 31, 2012
Goodwill	76.6			247.7			323.3		184.0			831.6
Accumulated impairment losses	—			—			—		(149.2		)	(149.2		)
	$	76.6		$	247.7		$	323.3	$	34.8		$	682.4

The change in the carrying amount of goodwill during the year ended January 31, 2011 is as follows:



	Platform Solutions and Emerging Business		Architecture, Engineering and Construction			Manufacturing		Media and Entertainment			Total
Balance as of January 31, 2010
Goodwill	$	40.2	$	224.8		$	277.9	$	149.2		$	692.1
Accumulated impairment losses	—		—			—		(149.2		)	(149.2		)
	40.2		224.8			277.9		—			542.9
Goodwill acquired during the year	4.6		—			—		5.5			10.1
Effect of foreign currency translation, purchase accounting adjustments and other	0.5		(0.6		)	1.2		—			1.1
Balance as of January 31, 2011
Goodwill	45.3		224.2			279.1		154.7			703.3
Accumulated impairment losses	—		—			—		(149.2		)	(149.2		)
	$	45.3	$	224.2		$	279.1	$	5.5		$	554.1

Purchase accounting adjustments reflect revisions made to the Company’s preliminary purchase price allocation during fiscal 2012 and 2011.

Impairment of Long-Lived Assets, Policy

Impairment of Long-Lived Assets

Deferred Tax Assets, Policy

Deferred Tax Assets

Revenue Recognition, Policy

Revenue Recognition

License and other revenue are comprised of two components: (1) all forms of product license revenue and (2) other revenue:

(1) All Forms of Product License Revenue

(2) Other Revenue

Other revenue includes revenue from consulting, training, Autodesk Developers Network and Creative Finishing customer support, and is recognized over time, as the services are performed.

Taxes Collected from Customers

Shipping and Handling Cost, Policy

Shipping and Handling Costs

Shipping and handling costs are included in cost of revenue for all periods presented

Shock-Based Compensation Expense, Policy

Stock-based Compensation Expense



	Fiscal Year Ended January 31,
	2012			2011			2010
Cost of license and other revenue	$	3.9		$	2.9		$	3.1
Marketing and sales	48.3			35.5			41.1
Research and development	38.1			27.4			30.0
General and administrative	18.5			14.9			19.4
Stock-based compensation expense related to stock awards and ESP Plan purchases	108.8			80.7			93.6
Tax benefit	(27.1		)	(22.0		)	(22.2		)
Stock-based compensation expense related to stock awards and ESP Plan purchases	$	81.7		$	58.7		$	71.4

Autodesk uses the BSM option-pricing model to estimate the fair value of stock-based awards based on the following assumptions:



	Fiscal Year Ended		Fiscal Year Ended		Fiscal Year Ended
	January 31, 2012		January 31, 2011		January 31, 2010
	Stock Option Plans	ESP Plan	Stock Option Plans	ESP Plan	Stock Option Plans	ESP Plan
Range of expected volatilities	40 - 49%	34 - 44%	40 - 45%	33 - 47%	43 - 55%	43 - 73%
Range of expected lives (in years)	2.6 - 4.8	0.5 - 2.0	2.6 - 4.4	0.5 - 2.0	2.7 - 4.0	0.5 - 2.0
Expected dividends	—%	—%	—%	—%	—%	—%
Range of risk-free interest rates	0.5 - 1.9%	0.1 - 0.8%	0.8 - 1.9%	0.2 - 1.1%	1.0 - 2.4%	0.2 - 1.0%
Expected forfeitures	7.8 - 10.5%	7.8 - 10.5%	10.5 - 13.5%	10.5 - 13.5%	13.5%	13.5%

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

Advertising Expenses, Policy

Advertising Expenses

Advertising costs are expensed as incurred. Total advertising expenses incurred were $21.3 million in fiscal 2012, $18.8 million in fiscal 2011 and $18.4 million in fiscal

Net Income Per Share, Policy

Net Income Per Share

Accounting Standards in Fiscal 2012, Policy

Accounting Standards in Fiscal 2012

Accounting Standards Adopted

Recently Issued Accounting Standards

Business and Summary of Significant Accounting Policies (Tables)

12 Months Ended

Jan. 31, 2012

Business and Summary of Significant Accounting Policies [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable

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



	2012			2011
Trade accounts receivable	$	433.9		$	363.0
Less: Allowance for doubtful accounts	(5.5		)	(4.2		)
Product returns reserve	(5.8		)	(10.6		)
Partner programs and other obligations	(27.5		)	(29.8		)
Accounts receivable, net	$	395.1		$	318.4

Concentration Risk Disclosure

Geographical concentrations of consolidated cash, cash equivalents and marketable securities held by Autodesk as of January 31:



	2012		2011
United States	11	%	14	%
Other Americas	1	%	1	%
Europe, Middle East and Africa (“EMEA”)	51	%	49	%
Asia Pacific (“APAC”)	37	%	36	%

Property, Plant and Equipment

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



	2012			2011
Computer software, at cost	$	133.5		$	129.4
Computer hardware, at cost	153.3			123.7
Leasehold improvements, land and buildings, at cost	139.5			121.3
Furniture and equipment, at cost	47.7			43.6
	474.0			418.0
Less: Accumulated depreciation	(369.5		)	(333.5		)
Computer software, hardware, leasehold improvements, furniture and equipment, net	$	104.5		$	84.5

Schedule of Finite-Lived Intangible Assets by Major Class

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



	2012			2011
Purchased technologies, at cost(1)	$	378.7		$	313.1
Customer relationships, trade names, patents, and user lists, at cost(2)	215.3			179.1
	594.0			492.2
Less: Accumulated amortization	(445.2		)	(373.4		)
Other intangible assets, net	$	148.8		$	118.8

____________________

(1)


(2)	Included as a net balance in “Other assets” in the Consolidated Balance Sheet. Customer relationships and trade names include the effects of foreign currency translation.

Schedule of Expected Amortization Expense

Expected future amortization expense for purchased technologies, customer relationships and trade names for each of the fiscal years ended thereafter is as follows:



	Year ending January 31,
2013	$	65.7
2014	47.1
2015	25.5
2016	7.9
2017	1.0
Thereafter	1.6
Total	$	148.8

Schedule of Goodwill

The change in the carrying amount of goodwill during the year ended January 31, 2012 is as follows:



	Platform Solutions and Emerging Business			Architecture, Engineering and Construction			Manufacturing		Media and Entertainment			Total
Balance as of January 31, 2011
Goodwill	$	45.3		$	224.2		$	279.1	$	154.7		$	703.3
Accumulated impairment losses	—			—			—		(149.2		)	(149.2		)
	45.3			224.2			279.1		5.5			554.1
Scaleform acquisition	—			—			—		22.6			22.6
Blue Ridge acquisition	—			—			22.3		—			22.3
Instructables acquisition	24.4			—			—		—			24.4
Micro Application Packages Limited acquisition	—			12.7			—		—			12.7
T-Splines acquisition	—			—			19.8		—			19.8
Goodwill acquired from other acquisitions	7.6			12.0			2.0		6.7			28.3
Effect of foreign currency translation, purchase accounting adjustments and other	(0.7		)	(1.2		)	0.1		—			(1.8		)
Balance as of January 31, 2012
Goodwill	76.6			247.7			323.3		184.0			831.6
Accumulated impairment losses	—			—			—		(149.2		)	(149.2		)
	$	76.6		$	247.7		$	323.3	$	34.8		$	682.4

The change in the carrying amount of goodwill during the year ended January 31, 2011 is as follows:



	Platform Solutions and Emerging Business		Architecture, Engineering and Construction			Manufacturing		Media and Entertainment			Total
Balance as of January 31, 2010
Goodwill	$	40.2	$	224.8		$	277.9	$	149.2		$	692.1
Accumulated impairment losses	—		—			—		(149.2		)	(149.2		)
	40.2		224.8			277.9		—			542.9
Goodwill acquired during the year	4.6		—			—		5.5			10.1
Effect of foreign currency translation, purchase accounting adjustments and other	0.5		(0.6		)	1.2		—			1.1
Balance as of January 31, 2011
Goodwill	45.3		224.2			279.1		154.7			703.3
Accumulated impairment losses	—		—			—		(149.2		)	(149.2		)
	$	45.3	$	224.2		$	279.1	$	5.5		$	554.1

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

The following table summarizes stock-based compensation expense for fiscal 2012, 2011 and 2010, respectively, as follows:



	Fiscal Year Ended January 31,
	2012			2011			2010
Cost of license and other revenue	$	3.9		$	2.9		$	3.1
Marketing and sales	48.3			35.5			41.1
Research and development	38.1			27.4			30.0
General and administrative	18.5			14.9			19.4
Stock-based compensation expense related to stock awards and ESP Plan purchases	108.8			80.7			93.6
Tax benefit	(27.1		)	(22.0		)	(22.2		)
Stock-based compensation expense related to stock awards and ESP Plan purchases	$	81.7		$	58.7		$	71.4

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

Autodesk uses the BSM option-pricing model to estimate the fair value of stock-based awards based on the following assumptions:



	Fiscal Year Ended		Fiscal Year Ended		Fiscal Year Ended
	January 31, 2012		January 31, 2011		January 31, 2010
	Stock Option Plans	ESP Plan	Stock Option Plans	ESP Plan	Stock Option Plans	ESP Plan
Range of expected volatilities	40 - 49%	34 - 44%	40 - 45%	33 - 47%	43 - 55%	43 - 73%
Range of expected lives (in years)	2.6 - 4.8	0.5 - 2.0	2.6 - 4.4	0.5 - 2.0	2.7 - 4.0	0.5 - 2.0
Expected dividends	—%	—%	—%	—%	—%	—%
Range of risk-free interest rates	0.5 - 1.9%	0.1 - 0.8%	0.8 - 1.9%	0.2 - 1.1%	1.0 - 2.4%	0.2 - 1.0%
Expected forfeitures	7.8 - 10.5%	7.8 - 10.5%	10.5 - 13.5%	10.5 - 13.5%	13.5%	13.5%

- Definition

The entire disclosure for any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. This disclosure informs financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 107

-Paragraph 15A

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 94-6

-Paragraph 21, 22, 24

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 21

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13537-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6327-108592

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6947722&loc=d3e13531-108611

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6351-108592

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6404-108592

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 21

-URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6442-108592

+ Details

- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

+ References+ Details

- Definition

Tabular disclosure of the useful life and salvage value of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

+ References+ Details

- Definition

Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

+ References+ Details

- Definition

Tabular disclosure of amortizable intangibles assets, in total and by major class, including the gross carrying amount and accumulated amortization. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References+ Details

- Definition

Tabular disclosure of goodwill by reportable segment and in total. Disclosure details may include, but are not limited to, the carrying amount of goodwill, goodwill acquired during the year, goodwill impairment losses recognized, goodwill written-off due to the sale of a business unit, goodwill not yet allocated, and any other changes to goodwill.

+ References+ Details

Financial Instruments (Tables)

12 Months Ended

Jan. 31, 2012

Cost and Fair Value of Financial Instruments Disclosure



			January 31, 2012
			Amortized Cost		Gross unrealized gains		Gross unrealized losses			Fair Value		Level 1		Level 2		Level 3
Cash equivalents (1):
	Certificates of deposit and time deposits		$	493.6	$	—	$	—		$	493.6	$	11.3	$	482.3	$	—
	Commercial paper		297.9		—		—			297.9		—		297.9		—
	Money market funds		62.1		—		—			62.1		—		62.1		—
Marketable securities:
	Short-term available for sale
		Commercial paper and corporate debt securities	143.7		0.1		—			143.8		35.3		108.5		—
		Certificates of deposit and time deposits	5.2		—		—			5.2		—		5.2		—
		U.S. treasury securities	30.7		—		—			30.7		30.7		—		—
		U.S. government agency securities	38.2		—		—			38.2		38.2		—		—
		Municipal securities	4.7		—		—			4.7		4.7		—		—
		Other	0.3		—		—			0.3		0.3		—		—
	Short-term trading securities
		Mutual funds	29.8		1.8		(0.1		)	31.5		31.5		—		—
	Long-term available for sale
		Corporate debt securities	107.8		1.0		(0.2		)	108.6		108.6		—		—
		U.S. treasury securities	23.6		0.2		—			23.8		23.8		—		—
		U.S. government agency securities	51.4		0.2		—			51.6		51.6		—		—
		Municipal securities	4.6		—		—			4.6		4.6		—		—
		Taxable auction-rate securities	4.2		—		—			4.2		—		—		4.2
Convertible debt securities (2)			18.3		—		—			18.3		—		—		18.3
Derivative contracts (3)			11.6		6.5		(2.2		)	15.9		—		9.7		6.2
		Total	$	1,327.7	$	9.8	$	(2.5	)	$	1,335.0	$	340.6	$	965.7	$	28.7

____________________


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


(2)	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.



			January 31, 2011
			Amortized Cost		Gross unrealized gains		Gross unrealized losses			Fair Value		Level 1		Level 2		Level 3
Cash equivalents (1):
	Certificates of deposit and time deposits		$	383.3	$	—	$	—		$	383.3	$	97.9	$	285.4	$	—
	Commercial paper		331.0		—		—			331.0		—		331.0		—
	Money market funds		43.8		—		—			43.8		—		43.8		—
Marketable securities:
	Short-term available for sale
		Commercial paper and corporate debt securities	47.6		0.1		—			47.7		37.7		10.0		—
		Certificates of deposit and time deposits	29.0		—		—			29.0		25.0		4.0		—
		U.S. treasury securities	26.0		—		—			26.0		26.0		—		—
		U.S. government agency securities	47.2		—		—			47.2		47.2		—		—
		Sovereign debt	9.1		—		—			9.1		—		9.1		—
		Municipal securities	8.6		—		—			8.6		8.6		—		—
		Other	0.3		—		—			0.3		0.3		—		—
	Short-term trading securities
		Mutual funds	29.7		1.7		(0.1		)	31.3		31.3		—		—
	Long-term available for sale
		Corporate debt securities	152.6		1.5		(0.1		)	154.0		154.0		—		—
		U.S. treasury securities	12.7		0.1		—			12.8		12.8		—		—
		U.S. government agency securities	12.7		0.2		—			12.9		12.9		—		—
		Municipal securities	4.7		—		—			4.7		4.7		—		—
		Sovereign debt	3.9		0.1		—			4.0		—		4.0		—
		Taxable auction-rate securities	4.2		—		—			4.2		—		—		4.2
Derivative contracts (2)			3.9		1.9		(1.9		)	3.9		—		3.9		—
		Total	$	1,150.3	$	5.6	$	(2.1	)	$	1,153.8	$	458.4	$	691.2	$	4.2

____________________


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


(2)	Included in “Prepaid expenses and other current assets,” "Other assets," or “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 years ended January 31, 2012 and 2011 was as follows:



	Fair Value Measurements Using Significant Unobservable Inputs
	(Level 3)
		Derivative Contracts		Convertible Debt Securities		Money Market Funds			Taxable Auction-Rate Securities			Total
Balance at January 31, 2010		$	—	$	—	$	10.0		$	7.6		$	17.6
Transfers into (out of) Level 3		—		—		—			—			—
Redemptions		—		—		(11.7		)	(3.4		)	(15.1		)
Total realized/unrealized gains (losses) included in earnings		—		—		1.7			—			1.7
Balance at January 31, 2011		—		—		—			4.2			4.2
Purchases		6.2		18.3		—			—			24.5
Transfers into (out of) Level 3		—		—		—			—			—
Redemptions		—		—		—			—			—
Total realized/unrealized gains (losses) included in earnings		—		—		—			—			—
Balance at January 31, 2012		$	6.2	$	18.3	$	—		$	4.2		$	28.7

Available-for-sale Securities

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



	January 31, 2012
	Cost		Fair Value
Due in 1 year	$	222.8	$	222.9
Due in 1 year through 5 years	205.7		206.9
Due in 5 years through 10 years	—		—
Due after 10 years	4.2		4.2
Total	$	432.7	$	434.0

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, 2012 and January 31, 2011:



	Balance Sheet Location	Fair Value at
	Balance Sheet Location	January 31, 2012		January 31, 2011
Derivative Assets
Foreign currency contracts designated as cash flow hedges	Prepaid expenses and other current assets	$	11.9	$	5.1
Derivatives not designated as hedging instruments	Other assets	6.2		—
Total derivative assets		$	18.1	$	5.1
Derivative Liabilities
Foreign currency contracts designated as cash flow hedges	Other accrued liabilities	$	2.2	$	1.2
Total derivative liabilities		$	2.2	$	1.2

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



	Foreign Currency Contracts
	Fiscal Year Ended January 31,
	2012			2011
Amount of gain (loss) recognized in accumulated other comprehensive income ("OCI") on derivatives (effective portion)	$	12.8		$	11.8
Amount and Location of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)
Net revenue	$	(1.9	)	$	13.0
Operating expenses	4.6			2.1
Total	$	2.7		$	15.1
Amount and Location of Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)
Interest and other income (expense), net	$	0.3		$	0.1



	Foreign Exchange Contracts
	Fiscal Year Ended January 31,
	2012			2011
Amount and Location of Gain (Loss) Recognized in Income on Derivative
Interest and other income, net	$	(1.3	)	$	2.3

- Definition

Tabular disclosure of available-for-sale securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 03-1

-Paragraph 21

-Subparagraph a, b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

-Number FAS115-1/124-1

-Paragraph 17

-Subparagraph a, b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 19, 20, 21

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 7

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 3

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

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-Name Accounting Standards Codification

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-Publisher FASB

-Name Accounting Standards Codification

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-Name Accounting Standards Codification

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-Topic 942

-SubTopic 320

-Section 50

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-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803

+ Details

- Definition

Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

+ References+ Details

- Definition

Tabular disclosure of the location and amount of gains and losses reported in the statement of financial performance, or when applicable, the statement of financial position. For example, (a) gains and losses recognized in the income statement on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges and (b) gains and losses initially recognized in other comprehensive income on derivative instruments designated and qualifying as cash flow hedges.

+ References+ Details

- Definition

Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position.

+ References+ Details

Employee and Director Stock Plans (Tables)

12 Months Ended

Jan. 31, 2012

Schedule of Share-based Compensation, Stock Options, Activity

A summary of stock option activity for the fiscal year ended January 31, 2012 is as follows:



	Number of Shares		Weighted average exercise price per share
	(in millions)
Options outstanding at January 31, 2011	30.4		$	28.93
Granted	5.4		40.71
Exercised	(5.3	)	24.85
Canceled	(2.1	)	36.29
Options outstanding at January 31, 2012	28.4		$	31.39
Options exercisable at January 31, 2012	16.7		$	30.98
Options vested and exercisable as of January 31, 2012 and expected to vest thereafter (1)	27.7		$	31.25
Options available for grant at January 31, 2012	18.0

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, and the weighted average grant date fair value per share of options granted, during the fiscal years ended January 31, 2012, 2011 and 2010.



	Fiscal year ended January 31,
	2012		2011		2010
Intrinsic value of options exercised (1)	$	85.7	$	61.9	$	18.8
Weighted average grant date fair value per share of stock options granted (2)	$	14.04	$	9.30	$	6.13

——————

(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.

(2) The weighted average grant date fair value per share of stock options granted is calculated, as of the stock option grant date, using the BSM option pricing model.

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

The following table summarizes information about options outstanding and exercisable at January 31, 2012:



	Options Exercisable						Options Outstanding
	Number of Shares (in millions)	Weighted average contractual life (in years)	Weighted average exercise price per share		Aggregate intrinsic value(1) (in millions)		Number of Shares (in millions)	Weighted average contractual life (in years)	Weighted average exercise price per share		Aggregate intrinsic value(1) (in millions)
Range of per-share exercise prices:
$2.28 - $17.37	3.8		$	12.94			5.8		$	13.61
$17.39 - $29.49	2.6		25.81				6.1		27.64
$29.50 - $37.16	4.4		32.94				6.0		32.72
$37.26 - $41.62	2.0		38.40				5.9		40.46
$42.01 - $49.80	3.9		45.69				4.6		45.42
	16.7	2.1	$	30.98	$	127.7	28.4	4.0	$	31.39	$	201.3

____________________


(1)	Represents the total intrinsic value, based on Autodesk’s closing stock price of $36.00 per share as of January 31, 2012, which would have been received by the option holders had all option holders exercised their options as of that date.

Restricted Share Activity Disclosure

A summary of restricted stock award and restricted stock unit activity for the fiscal year ended January 31, 2012 is as follows:



	Unreleased Restricted Stock		Weighted average grant date fair value
	(in thousands)
Unreleased restricted stock at January 31, 2011	1,426.8		$	30.43
Granted	1,610.5		37.07
Released	(707.6	)	25.95
Canceled	(145.6	)	32.37
Unreleased restricted stock at January 31, 2012	2,184.1		$	36.65

Employee and Director Stock Options Outstanding

Equity Compensation Plan Information



	(a)	(b)		(c)
Plan category	Number of securities to be issued upon exercise of outstanding options	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))
Equity compensation plans approved by security holders	30.2	$	29.38	47.7	(1)
Equity compensation plans not approved by security holders(2)	0.4	$	11.03	—
Total	30.6	$	29.15	47.7

____________________


(1)	Included in this amount are 29.7 million securities available for future issuance under Autodesk’s ESP Plan.


(2)	Amounts correspond to Autodesk’s Nonstatutory Stock Option Plan, which was terminated by the Board of Directors in December 2004.

- Definition

Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

+ References+ Details

Income Taxes (Tables)

12 Months Ended

Jan. 31, 2012

Provision for income taxes

The provision for income taxes consists of the following:



	Fiscal year ended January 31,
	2012			2011			2010
Federal:
Current	$	54.3		$	16.0		$	12.3
Deferred	(34.5		)	(8.2		)	(33.0		)
State:
Current	4.9			(1.5		)	3.0
Deferred	1.3			7.4			7.1
Foreign:
Current	55.9			48.4			34.1
Deferred	(4.3		)	(2.1		)	3.2
	$	77.6		$	60.0		$	26.7

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,
	2012			2011			2010
Income tax provision at U.S. Federal statutory rate	$	127.0		$	95.2		$	29.7
State income tax expense (benefit), net of the U.S. Federal benefit	2.8			1.4			(0.6		)
Foreign income taxed at rates different from the U.S. statutory rate	(61.5		)	(39.7		)	(22.7		)
U.S. valuation allowance	1.7			2.8			14.9
Non-deductible stock-based compensation	12.8			7.9			11.7
Research and development tax credit benefit	(6.0		)	(5.6		)	(4.7		)
Tax benefit from closure of income tax audits and decreases in uncertain tax positions	(0.4		)	(2.8		)	(2.5		)
Officer compensation in excess of $1.0 million	1.9			0.5			0.3
Goodwill impairment	—			—			—
Non-deductible in-process research and development charge	—			—			—
Other	(0.7		)	0.3			0.6
	$	77.6		$	60.0		$	26.7

Components of Deferred Tax Assets and Liabilities

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



	January 31,
	2012			2011
Nonqualified stock options	$	71.6		$	69.0
Research and development tax credit carryforwards	49.3			64.0
Foreign tax credit carryforwards	0.1			16.6
Accrued compensation and benefits	35.6			33.7
Other accruals not currently deductible for tax	31.1			20.8
Purchased technology and capitalized software	20.6			25.3
Fixed assets	15.9			15.1
Tax loss carryforwards	12.4			6.3
Other	3.7			2.6
Total deferred tax assets	240.3			253.4
Less: valuation allowance	(47.5		)	(42.9		)
Net deferred tax assets	192.8			210.5
Tax method change on advanced payments	(6.3		)	(9.4		)
Unremitted earnings of foreign subsidiaries	(20.6		)	(53.6		)
Total deferred tax liability	(26.9		)	(63.0		)
Net deferred tax assets	$	165.9		$	147.5

Unrecognized Tax Benefits Reconciliation, Table

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



	2012			2011			2010
Gross unrecognized tax benefits at the beginning of the fiscal year	$	188.4		$	178.2		$	169.4
Increases for tax positions of prior years	0.4			2.0			3.1
Decreases for tax positions of prior years	(0.4		)	(3.5		)	(1.9		)
Increases for tax positions related to the current year	14.3			13.9			11.1
Decreases for lapse of statute of limitations/audit settlements	(1.6		)	(2.2		)	(3.5		)
Gross unrecognized tax benefits at the end of the fiscal year	$	201.1		$	188.4		$	178.2

Acquisitions (Tables)

12 Months Ended

Jan. 31, 2012

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed



	Scaleform			Blue Ridge			Instructables			MAP			Turbo Squid		T-Splines		Other
Developed technologies	$	5.9		$	6.0		$	0.4		$	2.5		$	26.0	$	2.1	$	21.7
Customer relationships	4.4			9.2			0.2			2.0			—		0.7		3.9
Trade name	1.4			1.1			1.6			0.9			—		0.4		1.2
User List	—			—			5.1			—			—		—		—
Patent	3.6			—			—			—			—		—		—
In-process research and development	0.6			0.6			—			—			—		—		—
Goodwill	22.6			22.3			24.4			12.7			—		19.8		28.3
Deferred Revenue	—			(1.2		)	—			—			—		—		—
Deferred tax asset (liability)	(2.5		)	(3.6		)	(1.6		)	(1.6		)	—		—		0.2
Net tangible assets (liabilities)	0.2			6.8			0.1			6.5			—		—		(0.5		)
Total	$	36.2		$	41.2		$	30.2		$	23.0		$	26.0	$	23.0	$	54.8

Commitments and Contingencies (Tables)

12 Months Ended

Jan. 31, 2012

Commitments and Contingencies [Abstract]

Aggregate Future Minimum Lease Payments

At January 31, 2012, the aggregate future minimum lease payments required were as follows:




2013	$	50.8
2014	41.4
2015	34.9
2016	30.0
2017	23.9
Thereafter	59.9
	240.9
Less: Sublease income	3.3
	$	237.6

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,
	2012		2011		2010
Rent expense	$	53.0	$	52.1	$	56.8

- Definition

Tabular disclosure of a lessee's leasing arrangements including: (1) the basis on which contingent rental payments are determined, (2) the existence and terms of renewal or purchase options and escalation clauses, (3) restrictions imposed by lease arrangements, such as those concerning dividends, additional debt, and further leasing, (4) rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. Disclosure may also include the specific period used to amortize material leasehold improvements made at the inception of the lease or during the lease term. Additionally, for operating leases having initial or remaining noncancelable lease terms in excess of one year: (a) future minimum rental payments required as of the date of the latest balance sheet presented, in the aggregate and for each of the five succeeding fiscal years, (b) the total of minimum rentals to be received in the future under noncancelable subleases as of the date of the latest balance sheet presented, and (c) for all operating leases, rental expense for each period for which an income statement is presented, with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included.

+ References+ Details

Segments (Tables)

12 Months Ended

Jan. 31, 2012

Schedule of Segment Reporting Information, by Segment

Information concerning the operations of Autodesk’s reportable segments is as follows:



	Fiscal year ended January 31,
	2012			2011			2010
Net revenue:
Platform Solutions and Emerging Business	$	833.1		$	716.2		$	624.0
Architecture, Engineering and Construction	626.4			568.0			513.3
Manufacturing	540.3			470.0			386.9
Media and Entertainment	215.8			197.6			189.1
Other(1)	—			—			0.4
	$	2,215.6		$	1,951.8		$	1,713.7
Gross profit:
Platform Solutions and Emerging Business	$	788.0		$	678.9		$	589.7
Architecture, Engineering and Construction	569.7			517.6			465.2
Manufacturing	496.1			439.5			358.4
Media and Entertainment	174.6			153.9			144.4
Unallocated(2)	(41.9		)	(34.7		)	(35.8		)
	$	1,986.5		$	1,755.2		$	1,521.9
Depreciation and amortization:
Platform Solutions and Emerging Business	$	1.8		$	3.0		$	3.1
Architecture, Engineering and Construction	0.7			1.6			1.8
Manufacturing	1.7			2.3			2.5
Media and Entertainment	0.5			1.1			1.8
Unallocated	110.8			97.4			102.3
	$	115.5		$	105.4		$	111.5

____________________


(1)	Other primarily consisted of revenue from Autodesk’s Location Services division, which Autodesk disposed of in February 2009.


(2)	Unallocated amounts primarily relate to corporate expenses and other costs and expenses that are managed outside the reportable segments, including stock-based compensation expense.

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

Information regarding Autodesk’s operations by geographic area is as follows:



	Fiscal year ended January 31,
	2012		2011		2010
Net revenue:
Americas
U.S.	$	631.0	$	561.6	$	527.5
Other Americas	167.5		139.9		126.9
Total Americas	798.5		701.5		654.4
Europe, Middle East and Africa	862.2		782.8		671.1
Asia Pacific
Japan	240.5		200.6		171.1
Other Asia Pacific	314.4		266.9		217.1
Total Asia Pacific	554.9		467.5		388.2
Total net revenue	$	2,215.6	$	1,951.8	$	1,713.7



	January 31,
	2012		2011
Long-lived assets(1):
Americas
U.S.	$	792.5	$	571.2
Other Americas	39.2		65.6
Total Americas	831.7		636.8
Europe, Middle East and Africa
Switzerland	37.7		42.8
Other Europe, Middle East and Africa	83.4		68.5
Total Europe, Middle East and Africa	121.1		111.3
Asia Pacific	50.5		41.9
Total long-lived assets	$	1,003.3	$	790.0

____________________


(1)	Long-lived assets exclude investments in subsidiaries, deferred tax assets and marketable securities.

- Definition

Tabular disclosure of information concerning material long-lived assets (excluding financial instruments, customer relationships with financial institutions, mortgage and other servicing rights, deferred policy acquisition costs, and deferred taxes assets) located in identified geographic areas and/or the amount of revenue from external customers attributed to that country from which revenue is material. An entity may also provide subtotals of geographic information about groups of countries.

+ References+ Details

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References+ Details

Restructuring Reserve (Tables)

12 Months Ended

Jan. 31, 2012

Notes to Financial Statements [Abstract]

Schedule of Restructuring Reserve by Type of Cost

The following table sets forth the restructuring activities for the fiscal years ended January 31, 2012 and 2011.



	Balances, January 31, 2011		Additions		Payments			Adjustments(1)			Balances, January 31, 2012
Fiscal 2011 Plan
Employee termination costs	$	1.5	$	—	$	(1.5	)	$	—		$	—
Fiscal 2010 Plan
Employee termination costs	—		—								—
Lease termination and asset costs	1.7		—		(1.1		)	(0.3		)	0.3
Fiscal 2009 Plan
Employee termination costs	—		—		—			—			—
Lease termination and asset costs	2.8		—		(0.9		)	(1.3		)	0.6
Other
Employee termination costs	—		—		—			—			—
Lease termination costs	2.6		—		(0.8		)	(0.3		)	1.5
Total	$	8.6	$	—	$	(4.3	)	$	(1.9	)	$	2.4
Current portion(2)	$	4.8									$	1.1
Non-current portion(2)	3.8										1.3
Total	$	8.6									$	2.4

____________________


(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.



	Balances, January 31, 2010		Additions		Payments			Adjustments(1)			Balances, January 31, 2011
Fiscal 2011 Plan
Employee termination costs	$	—	$	12.4	$	(10.6	)	$	(0.3	)	$	1.5
Fiscal 2010 Plan
Employee termination costs	0.8		—		(0.8		)	—			—
Lease termination and asset costs	6.1		0.3		(4.3		)	(0.4		)	1.7
Fiscal 2009 Plan
Employee termination costs	1.0		—		(0.2		)	(0.8		)	—
Lease termination and asset costs	8.2		1.0		(4.6		)	(1.8		)	2.8
Other
Employee termination costs	0.4		—		(0.3		)	(0.1		)	—
Lease termination costs	2.9		—		(0.2		)	(0.1		)	2.6
Total	$	19.4	$	13.7	$	(21.0	)	$	(3.5	)	$	8.6
Current portion(2)	$	11.4									$	4.8
Non-current portion(2)	8.0										3.8
Total	$	19.4									$	8.6

____________________


(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.

- Definition

Tabular disclosure of an entity's restructuring reserve that occurred during the period associated with the exit from or disposal of business activities or restructurings for each major type of cost. This element may also include a description of any reversal and other adjustment made during the period to the amount of an accrued liability for restructuring activities. This element may be used to encapsulate the roll forward presentations of an entity's restructuring reserve by type of cost and in total, and explanation of changes that occurred in the period.

+ References+ Details

Selected Quarterly Financial Information (Tables)

12 Months Ended

Jan. 31, 2012

Selected Quarterly Financial Information (Unaudited) [Abstract]

Quarterly Financial Information

Summarized quarterly financial information for fiscal 2012 and 2011 is as follows:



2012	1st quarter			2nd quarter			3rd quarter			4th quarter			Fiscal year
Net revenue	$	528.3		$	546.3		$	548.6		$	592.4		$	2,215.6
Gross profit	473.7			488.9			489.0			534.9			1,986.5
Income from operations	78.6			95.0			90.2			91.8			355.6
Provision for income taxes	(15.2		)	(23.0		)	(18.5		)	(20.9		)	(77.6		)
Net income	69.3			71.2			72.8			72.0			285.3
Basic net income per share	$	0.30		$	0.31		$	0.32		$	0.32		$	1.25
Diluted net income per share	$	0.29		$	0.30		$	0.32		$	0.31		$	1.22
Income from operations includes the following items:
Stock-based compensation expense	$	25.9		$	27.3		$	25.6		$	30.0		$	108.8
Amortization of acquisition related intangibles	14.6			17.8			19.3			18.6			70.3
Restructuring benefits	—			(1.3		)	—			—			(1.3		)

2011	1st quarter			2nd quarter			3rd quarter			4th quarter			Fiscal year
Net revenue	$	474.6		$	472.8		$	476.7		$	527.7		$	1,951.8
Gross profit	423.3			424.4			428.2			479.3			1,755.2
Income from operations	50.8			79.8			69.2			71.6			271.4
Provision for income taxes	(10.5		)	(20.0		)	(18.1		)	(11.4		)	(60.0		)
Net income	36.9			59.9			53.6			61.6			212.0
Basic net income per share	$	0.16		$	0.26		$	0.24		$	0.27		$	0.93
Diluted net income per share	$	0.16		$	0.25		$	0.23		$	0.26		$	0.90
Income from operations includes the following items:
Stock-based compensation expense	$	24.3		$	21.0		$	17.0		$	18.4		$	80.7
Amortization of acquisition related intangibles	13.9			13.6			14.1			14.3			55.9
Restructuring charges	7.1			1.9			—			1.8			10.8

Business and Summary of Significant Accounting Policies Accounts Receivable, Net (Details) (USD $) In Millions, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Trade accounts receivable	$ 433.9	$ 363.0
Less: Allowance for Doubtful Accounts	(5.5)	(4.2)
Product Returns Reserve	(5.8)	(10.6)
Partner programs and other obligations	(27.5)	(29.8)
Accounts Receivable, Net	$ 395.1	$ 318.4

Business and Summary of Significant Accounting Policies Geographical Concentration of Consolidated Cash, Cash Equivalents and Marketable Securities (Details)	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Concentration Risk [Line Items]
Concentration Risk, Percentage	21.00%	22.00%	21.00%
United States
Concentration Risk [Line Items]
Concentration Risk, Percentage	11.00%	14.00%
Other Americas
Concentration Risk [Line Items]
Concentration Risk, Percentage	1.00%	1.00%
Europe, Middle East and Africa (EMEA)
Concentration Risk [Line Items]
Concentration Risk, Percentage	51.00%	49.00%
Asia Pacific (APAC)
Concentration Risk [Line Items]
Concentration Risk, Percentage	37.00%	36.00%

Business and Summary of Significant Accounting Policies Computer Equipment, Software, Furniture, Leasehold Improvements and the Related Accumulated Depriciaation (Details) (USD $) In Millions, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2011
Property, Plant and Equipment [Line Items]
Computer software, at cost	$ 133.5	$ 129.4
Computer hardware, at cost	153.3	123.7
Leasehold improvements, land and buildings, at cost	139.5	121.3
Furniture and equipment, at cost	47.7	43.6
Property, Plant and Equipment, Gross	474.0	418.0
Less: Accumulated depreciation	(369.5)	(333.5)
Computer software, hardware, leasehold improvements, furniture and equipment, net	$ 104.5	$ 84.5

- Definition

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

+ References+ Details

- Definition

Gross amount, at the balance sheet date, of long-lived physical assets used in the normal conduct of business and not intended for resale. This can include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

+ References+ Details

- Definition

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

+ References+ Details

Business and Summary of Significant Accounting Policies Other Intangible Assets and Related Accumulated Amortization (Details) (USD $)
In Millions, unless otherwise specified

Jan. 31, 2012

Jan. 31, 2011

Finite-Lived Intangible Assets [Line Items]

Purchased technologies, at cost

$ 378.7

^[1]

$ 313.1

^[1]

Customer relationships, trade names, patents, and user lists, at cost

215.3

^[2]

179.1

^[2]

Finite-Lived Intangible Assets, Gross

594.0

492.2

Less: Accumulated amortization

(445.2)

(373.4)

Other intangible assets, net

$ 148.8

$ 118.8

[1]

[2]

Included as a net balance in “Other assets” in the Consolidated Balance Sheet. Customer relationships and trade names include the effects of foreign currency translation.

Business and Summary of Significant Accounting Policies Expected Future Amortization Expense for Purcahsed Technologies, Customer Relationships and Trade Names (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2012
Expected Amortization Expense [Line Items]
2013	$ 65.7
2014	47.1
2015	25.5
2016	7.9
2017	1.0
Thereafter	1.6
Total	$ 148.8

Business and Summary of Significant Accounting Policies Changes In the Carrying Amount of Goodwill (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011
Goodwill [Roll Forward]
Goodwill before accumulated impairments	$ 703.3	$ 692.1
Accumulated impairment losses	(149.2)	(149.2)
Goodwill	554.1	542.9
Goodwill, Acquired During Period		10.1
Goodwill, Translation and Purchase Accounting Adjustments	(1.8)	1.1
Goodwill before accumulated impairments	831.6	703.3
Accumulated impairment losses	(149.2)	(149.2)
Goodwill	682.4	554.1
Platform Solutions and Emerging Business
Goodwill [Roll Forward]
Goodwill before accumulated impairments	45.3	40.2
Accumulated impairment losses	0	0
Goodwill	45.3	40.2
Goodwill, Acquired During Period		4.6
Goodwill, Translation and Purchase Accounting Adjustments	(0.7)	0.5
Goodwill before accumulated impairments	76.6	45.3
Accumulated impairment losses	0	0
Goodwill	76.6	45.3
Architecture, Engineering and Construction
Goodwill [Roll Forward]
Goodwill before accumulated impairments	224.2	224.8
Accumulated impairment losses	0	0
Goodwill	224.2	224.8
Goodwill, Acquired During Period		0
Goodwill, Translation and Purchase Accounting Adjustments	(1.2)	(0.6)
Goodwill before accumulated impairments	247.7	224.2
Accumulated impairment losses	0	0
Goodwill	247.7	224.2
Manufacturing
Goodwill [Roll Forward]
Goodwill before accumulated impairments	279.1	277.9
Accumulated impairment losses	0	0
Goodwill	279.1	277.9
Goodwill, Acquired During Period		0
Goodwill, Translation and Purchase Accounting Adjustments	0.1	1.2
Goodwill before accumulated impairments	323.3	279.1
Accumulated impairment losses	0	0
Goodwill	323.3	279.1
Media and Entertainment
Goodwill [Roll Forward]
Goodwill before accumulated impairments	154.7	149.2
Accumulated impairment losses	(149.2)	(149.2)
Goodwill	5.5	0
Goodwill, Acquired During Period		5.5
Goodwill, Translation and Purchase Accounting Adjustments	0	0
Goodwill before accumulated impairments	184.0	154.7
Accumulated impairment losses	(149.2)	(149.2)
Goodwill	34.8	5.5
Scaleform Corporation
Goodwill [Roll Forward]
Goodwill, Acquired During Period	22.6
Scaleform Corporation \| Platform Solutions and Emerging Business
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
Scaleform Corporation \| Architecture, Engineering and Construction
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
Scaleform Corporation \| Manufacturing
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
Scaleform Corporation \| Media and Entertainment
Goodwill [Roll Forward]
Goodwill, Acquired During Period	22.6
Blue Ridge Numerics, Inc
Goodwill [Roll Forward]
Goodwill, Acquired During Period	22.3
Blue Ridge Numerics, Inc \| Platform Solutions and Emerging Business
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
Blue Ridge Numerics, Inc \| Architecture, Engineering and Construction
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
Blue Ridge Numerics, Inc \| Manufacturing
Goodwill [Roll Forward]
Goodwill, Acquired During Period	22.3
Blue Ridge Numerics, Inc \| Media and Entertainment
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
Instructables Corporation
Goodwill [Roll Forward]
Goodwill, Acquired During Period	24.4
Instructables Corporation \| Platform Solutions and Emerging Business
Goodwill [Roll Forward]
Goodwill, Acquired During Period	24.4
Instructables Corporation \| Architecture, Engineering and Construction
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
Instructables Corporation \| Manufacturing
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
Instructables Corporation \| Media and Entertainment
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
Micro Application Packages Limited
Goodwill [Roll Forward]
Goodwill, Acquired During Period	12.7
Micro Application Packages Limited \| Platform Solutions and Emerging Business
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
Micro Application Packages Limited \| Architecture, Engineering and Construction
Goodwill [Roll Forward]
Goodwill, Acquired During Period	12.7
Micro Application Packages Limited \| Manufacturing
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
Micro Application Packages Limited \| Media and Entertainment
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
T-splines
Goodwill [Roll Forward]
Goodwill, Acquired During Period	19.8
T-splines \| Platform Solutions and Emerging Business
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
T-splines \| Architecture, Engineering and Construction
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
T-splines \| Manufacturing
Goodwill [Roll Forward]
Goodwill, Acquired During Period	19.8
T-splines \| Media and Entertainment
Goodwill [Roll Forward]
Goodwill, Acquired During Period	0
Other Acquisitions
Goodwill [Roll Forward]
Goodwill, Acquired During Period	28.3
Other Acquisitions \| Platform Solutions and Emerging Business
Goodwill [Roll Forward]
Goodwill, Acquired During Period	7.6
Other Acquisitions \| Architecture, Engineering and Construction
Goodwill [Roll Forward]
Goodwill, Acquired During Period	12.0
Other Acquisitions \| Manufacturing
Goodwill [Roll Forward]
Goodwill, Acquired During Period	2.0
Other Acquisitions \| Media and Entertainment
Goodwill [Roll Forward]
Goodwill, Acquired During Period	$ 6.7

- Definition

Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph e

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 43

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph l

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6905597&loc=d3e13816-109267

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 72

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph e

-Clause 1

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 34

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

- Definition

The aggregate amount of goodwill acquired in the period and allocated to the reportable segment. The value is stated at fair value based on the purchase price allocation.

+ References+ Details

- Definition

The increase (decrease) in the recorded value of goodwill for foreign currency translation adjustments and purchase accounting adjustments needed to revise the carrying amount of goodwill to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Subparagraph e

-Paragraph 45

-Clause 6

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=6905597&loc=d3e13816-109267

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 72

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Subparagraph e

-Paragraph 45

-Clause 3

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Subparagraph e

-Paragraph 45

-Clause 7

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Business and Summary of Significant Accounting Policies Stock Based Compensation Expense (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Oct. 31, 2010	Jul. 31, 2010	Apr. 30, 2010	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense related to stock awards and ESP Plan purchases	$ 30.0	$ 25.6	$ 27.3	$ 25.9	$ 18.4	$ 17.0	$ 21.0	$ 24.3	$ 108.8	$ 80.7	$ 93.6
Tax benefit									(27.1)	(22.0)	(22.2)
Stock-based compensation expense related to stock awards and ESP Plan purchases									81.7	58.7	71.4
Cost of license and other revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense									3.9	2.9	3.1
Marketing and sales
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense									48.3	35.5	41.1
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense									38.1	27.4	30.0
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Allocated Share-based Compensation Expense									$ 18.5	$ 14.9	$ 19.4

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References+ Details

Assumption Used to Estimate the Fair Value of Stock-Based Awards (Detail)	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Stock Option Plans
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
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items]
Expected dividends	0.00%	0.00%	0.00%
Employee Qualified Stock Purchase Plan 1998 ESP Plan \| Minimum
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items]
Range of expected volatilities	34.00%	33.00%	43.00%
Range of expected lives (in years)	0.5	0.5	0.5
Range of risk-free interest rates	0.10%	0.20%	0.20%
Expected forfeitures	7.80%	10.50%	13.50%
Employee Qualified Stock Purchase Plan 1998 ESP Plan \| Maximum
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items]
Range of expected volatilities	44.00%	47.00%	73.00%
Range of expected lives (in years)	2	2	2
Range of risk-free interest rates	0.80%	1.10%	1.00%
Expected forfeitures	10.50%	13.50%
Employee Stock Option Member \| Minimum
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items]
Range of expected volatilities	40.00%	40.00%	43.00%
Range of expected lives (in years)	2.6	2.6	2.7
Range of risk-free interest rates	0.50%	0.80%	1.00%
Expected forfeitures	7.80%	10.50%	13.50%
Employee Stock Option Member \| Maximum
Share based Compensation Arrangement by Share based Payment Award, Fair Value Assumptions, Method Used [Line Items]
Range of expected volatilities	49.00%	45.00%	55.00%
Range of expected lives (in years)	4.8	4.4	4
Range of risk-free interest rates	1.90%	1.90%	2.40%
Expected forfeitures	10.50%	13.50%

- Definition

The period of time an equity-based award is expected to be outstanding. An equity-based award's expected term is generally determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior.

+ References+ Details

- Definition

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

+ References+ Details

Business and Summary of Significant Accounting Policies Business and Summary of Significant Accounting Policies Additional Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 400.0
Total sales to the distributors Tech Data Corporation and its global affiliates ("Tech Data") relative to Autodesk's consolidated net revenue	17.00%	16.00%	14.00%
Concentration Risk, Percentage	21.00%	22.00%	21.00%
Depreciation, Nonproduction	43.7	47.6	50.4
Finite-Lived Intangible Assets, Useful Life, Minimum	2
Finite-Lived Intangible Assets, Useful Life, Maximum	7
Finite-Lived Intangible Assets, Amortization Expense	71.8	57.8	61.2
Cumulative error from the understatement of stock-based compensation, net of tax effects			6.8
Advertising Expense	21.3	18.8	18.4
Purchased Technologies, Customer Relationships and Trade Names
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life	5.4
Cost of Sales
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Cumulative error from the understatement of stock-based compensation, net of tax effects			0.4
Selling and Marketing Expense
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Cumulative error from the understatement of stock-based compensation, net of tax effects			4.4
Other Research and Development Expense
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Cumulative error from the understatement of stock-based compensation, net of tax effects			2.9
General and Administrative Expense
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Cumulative error from the understatement of stock-based compensation, net of tax effects			2.1
Reduction in Taxes
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Cumulative error from the understatement of stock-based compensation, net of tax effects			3.0
Accounts Receivable
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Concentration Risk, Percentage	21.00%	16.00%
Media and Entertainment
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Goodwill, Impairment Loss			$ 21.0

Cost and Fair Value of Financial Instruments (Detail) (USD $)
In Millions, unless otherwise specified

12 Months Ended

Jan. 31, 2012

Jan. 31, 2011

Jan. 31, 2010

Jan. 31, 2009

Schedule of Available-for-sale Securities [Line Items]

Cash equivalents

$ 1,156.9

$ 1,075.1

$ 838.7

$ 917.6

Derivative Instruments And Hedges at Amortized Cost, Net

11.6

3.9

^[1]

Unrealized Gain on Foreign Currency Derivatives, before Tax

6.5

1.9

^[1]

Unrealized Loss on Foreign Currency Derivatives, before Tax

(2.2)

(1.9)

^[1]

Derivative, Fair Value, Net

15.9

3.9

^[1]

Amortized Cost Securities

1,327.7

1,150.3

Unrealized Gain on Securities

9.8

5.6

Unrealized Loss on Securities

(2.5)

(2.1)

Total

1,335.0

1,153.8

Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Trading Securities

29.8

29.7

Trading Securities, Unrealized Holding Gain

1.8

1.7

Trading Securities, Unrealized Holding Loss

(0.1)

Trading Securities, Fair Value Disclosure

31.3

Other Assets

Schedule of Available-for-sale Securities [Line Items]

Convertible Debt Securities, Amortized Cost

18.3

Convertible Debt Securities, Unrealized Gains

Convertible Debt Securities, Unrealized Losses

Convertible Debt Securities, Fair Value Disclosure

18.3

Fair Value, Inputs, Level 1

Schedule of Available-for-sale Securities [Line Items]

Derivative, Fair Value, Net

^[1]

Total

340.6

458.4

Fair Value, Inputs, Level 1 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Trading Securities, Fair Value Disclosure

31.5

31.3

Fair Value, Inputs, Level 1 | Other Assets

Schedule of Available-for-sale Securities [Line Items]

Convertible Debt Securities, Fair Value Disclosure

Fair Value, Inputs, Level 2

Schedule of Available-for-sale Securities [Line Items]

Derivative, Fair Value, Net

9.7

3.9

^[1]

Total

965.7

691.2

Fair Value, Inputs, Level 2 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Trading Securities, Fair Value Disclosure

Fair Value, Inputs, Level 2 | Other Assets

Schedule of Available-for-sale Securities [Line Items]

Convertible Debt Securities, Fair Value Disclosure

Fair Value, Inputs, Level 3

Schedule of Available-for-sale Securities [Line Items]

Derivative, Fair Value, Net

6.2

^[1]

Total

28.7

4.2

Fair Value, Inputs, Level 3 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Trading Securities, Fair Value Disclosure

Fair Value, Inputs, Level 3 | Other Assets

Schedule of Available-for-sale Securities [Line Items]

Convertible Debt Securities, Fair Value Disclosure

18.3

Commercial paper and corporate securities | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Amortized Cost Basis

143.7

47.6

Available-for-sale Securities, Gross Unrealized Gains

0.1

Available-for-sale Securities, Gross Unrealized Losses

Available-for-sale Securities, Fair Value Disclosure

143.8

47.7

Commercial paper and corporate securities | Fair Value, Inputs, Level 1 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

35.3

37.7

Commercial paper and corporate securities | Fair Value, Inputs, Level 2 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

108.5

10.0

Commercial paper and corporate securities | Fair Value, Inputs, Level 3 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

Certificates of deposit and time deposits | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Amortized Cost Basis

5.2

29.0

Available-for-sale Securities, Gross Unrealized Gains

Available-for-sale Securities, Gross Unrealized Losses

Available-for-sale Securities, Fair Value Disclosure

5.2

29.0

Certificates of deposit and time deposits | Fair Value, Inputs, Level 1 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

25.0

Certificates of deposit and time deposits | Fair Value, Inputs, Level 2 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

5.2

4.0

Certificates of deposit and time deposits | Fair Value, Inputs, Level 3 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

U.S. Treasury Securities | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Amortized Cost Basis

30.7

26.0

Available-for-sale Securities, Gross Unrealized Gains

Available-for-sale Securities, Gross Unrealized Losses

Available-for-sale Securities, Fair Value Disclosure

30.7

26.0

U.S. Treasury Securities | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Amortized Cost Basis

23.6

12.7

Available-for-sale Securities, Gross Unrealized Gains

0.2

0.1

Available-for-sale Securities, Gross Unrealized Losses

Available-for-sale Securities, Fair Value Disclosure

23.8

12.8

U.S. Treasury Securities | Fair Value, Inputs, Level 1 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

30.7

26.0

U.S. Treasury Securities | Fair Value, Inputs, Level 1 | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

23.8

12.8

U.S. Treasury Securities | Fair Value, Inputs, Level 2 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

U.S. Treasury Securities | Fair Value, Inputs, Level 2 | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

U.S. Treasury Securities | Fair Value, Inputs, Level 3 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

U.S. Treasury Securities | Fair Value, Inputs, Level 3 | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

US government agency securities | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Amortized Cost Basis

38.2

47.2

Available-for-sale Securities, Gross Unrealized Gains

Available-for-sale Securities, Gross Unrealized Losses

Available-for-sale Securities, Fair Value Disclosure

38.2

47.2

US government agency securities | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Amortized Cost Basis

51.4

12.7

Available-for-sale Securities, Gross Unrealized Gains

0.2

Available-for-sale Securities, Gross Unrealized Losses

Available-for-sale Securities, Fair Value Disclosure

51.6

12.9

US government agency securities | Fair Value, Inputs, Level 1 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

38.2

47.2

US government agency securities | Fair Value, Inputs, Level 1 | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

51.6

12.9

US government agency securities | Fair Value, Inputs, Level 2 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

US government agency securities | Fair Value, Inputs, Level 2 | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

US government agency securities | Fair Value, Inputs, Level 3 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

US government agency securities | Fair Value, Inputs, Level 3 | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

Municipal securities | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Amortized Cost Basis

4.7

8.6

Available-for-sale Securities, Gross Unrealized Gains

Available-for-sale Securities, Gross Unrealized Losses

Available-for-sale Securities, Fair Value Disclosure

4.7

8.6

Municipal securities | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Amortized Cost Basis

4.6

4.7

Available-for-sale Securities, Gross Unrealized Gains

Available-for-sale Securities, Gross Unrealized Losses

Available-for-sale Securities, Fair Value Disclosure

4.6

4.7

Municipal securities | Fair Value, Inputs, Level 1 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

4.7

8.6

Municipal securities | Fair Value, Inputs, Level 1 | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

4.6

4.7

Municipal securities | Fair Value, Inputs, Level 2 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

Municipal securities | Fair Value, Inputs, Level 2 | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

Municipal securities | Fair Value, Inputs, Level 3 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

Municipal securities | Fair Value, Inputs, Level 3 | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

Other | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Amortized Cost Basis

0.3

Available-for-sale Securities, Gross Unrealized Gains

Available-for-sale Securities, Gross Unrealized Losses

Available-for-sale Securities, Fair Value Disclosure

0.3

Other | Fair Value, Inputs, Level 1 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

0.3

Other | Fair Value, Inputs, Level 2 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

Other | Fair Value, Inputs, Level 3 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

Sovereign Debt | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Amortized Cost Basis

9.1

Available-for-sale Securities, Gross Unrealized Gains

Available-for-sale Securities, Gross Unrealized Losses

Available-for-sale Securities, Fair Value Disclosure

9.1

Sovereign Debt | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Amortized Cost Basis

3.9

Available-for-sale Securities, Gross Unrealized Gains

0.1

Available-for-sale Securities, Gross Unrealized Losses

Available-for-sale Securities, Fair Value Disclosure

4.0

Sovereign Debt | Fair Value, Inputs, Level 1 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

Sovereign Debt | Fair Value, Inputs, Level 1 | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

Sovereign Debt | Fair Value, Inputs, Level 2 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

9.1

Sovereign Debt | Fair Value, Inputs, Level 2 | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

4.0

Sovereign Debt | Fair Value, Inputs, Level 3 | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

Sovereign Debt | Fair Value, Inputs, Level 3 | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

Corporate debt securities | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Amortized Cost Basis

107.8

152.6

Available-for-sale Securities, Gross Unrealized Gains

1.0

1.5

Available-for-sale Securities, Gross Unrealized Losses

(0.2)

(0.1)

Available-for-sale Securities, Fair Value Disclosure

108.6

154.0

Corporate debt securities | Fair Value, Inputs, Level 1 | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

108.6

154.0

Corporate debt securities | Fair Value, Inputs, Level 2 | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

Corporate debt securities | Fair Value, Inputs, Level 3 | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

Taxable auction rate securities | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Amortized Cost Basis

4.2

Available-for-sale Securities, Gross Unrealized Gains

Available-for-sale Securities, Gross Unrealized Losses

Available-for-sale Securities, Fair Value Disclosure

4.2

Taxable auction rate securities | Fair Value, Inputs, Level 1 | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

Taxable auction rate securities | Fair Value, Inputs, Level 2 | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

Taxable auction rate securities | Fair Value, Inputs, Level 3 | Marketable Securities, Noncurrent

Schedule of Available-for-sale Securities [Line Items]

Available-for-sale Securities, Fair Value Disclosure

4.2

Certificates of deposit and time deposits

Schedule of Available-for-sale Securities [Line Items]

Cash equivalents

493.6

^[2]

383.3

^[2]

Cash and Cash Equivalents, Fair Value Disclosure

493.6

^[2]

383.3

^[2]

Certificates of deposit and time deposits | Fair Value, Inputs, Level 1

Schedule of Available-for-sale Securities [Line Items]

Cash and Cash Equivalents, Fair Value Disclosure

11.3

^[2]

97.9

^[2]

Certificates of deposit and time deposits | Fair Value, Inputs, Level 2

Schedule of Available-for-sale Securities [Line Items]

Cash and Cash Equivalents, Fair Value Disclosure

482.3

^[2]

285.4

^[2]

Certificates of deposit and time deposits | Fair Value, Inputs, Level 3

Schedule of Available-for-sale Securities [Line Items]

Cash and Cash Equivalents, Fair Value Disclosure

^[2]

Commercial Paper

Schedule of Available-for-sale Securities [Line Items]

Cash equivalents

297.9

^[2]

331.0

^[2]

Cash and Cash Equivalents, Fair Value Disclosure

297.9

^[2]

331.0

^[2]

Commercial Paper | Fair Value, Inputs, Level 1

Schedule of Available-for-sale Securities [Line Items]

Cash and Cash Equivalents, Fair Value Disclosure

^[2]

Commercial Paper | Fair Value, Inputs, Level 2

Schedule of Available-for-sale Securities [Line Items]

Cash and Cash Equivalents, Fair Value Disclosure

297.9

^[2]

331.0

^[2]

Commercial Paper | Fair Value, Inputs, Level 3

Schedule of Available-for-sale Securities [Line Items]

Cash and Cash Equivalents, Fair Value Disclosure

^[2]

Money Market Funds

Schedule of Available-for-sale Securities [Line Items]

Cash equivalents

62.1

^[2]

43.8

^[2]

Cash and Cash Equivalents, Fair Value Disclosure

62.1

^[2]

43.8

^[2]

Money Market Funds | Fair Value, Inputs, Level 1

Schedule of Available-for-sale Securities [Line Items]

Cash and Cash Equivalents, Fair Value Disclosure

^[2]

Money Market Funds | Fair Value, Inputs, Level 2

Schedule of Available-for-sale Securities [Line Items]

Cash and Cash Equivalents, Fair Value Disclosure

62.1

^[2]

43.8

^[2]

Money Market Funds | Fair Value, Inputs, Level 3

Schedule of Available-for-sale Securities [Line Items]

Cash and Cash Equivalents, Fair Value Disclosure

^[2]

Rabbi Trust | Marketable Securities, Current

Schedule of Available-for-sale Securities [Line Items]

Trading Securities, Fair Value Disclosure

$ 31.5

[1]	Included in “Prepaid expenses and other current assets,” "Other assets," or “Other accrued liabilities” in the accompanying Consolidated Balance Sheets.
[2]	Included in “Cash and cash equivalents” in the accompanying Consolidated Balance Sheets.

Contractual Maturities of Types of Securities (Detail) (USD $) In Millions, unless otherwise specified	Jan. 31, 2012
Cost
Due in less than 1 year	$ 222.8
Due in 1 year through 5 years	205.7
Due in 5 years through 10 years	0
Due after 10 years	4.2
Total	432.7
Fair Value
Due in less than 1 year	222.9
Due in 1 year through 5 years	206.9
Due in 5 years through 10 years	0
Due after 10 years	4.2
Total	$ 434.0

Reconciliation of the Change in Level 3 Items (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	$ 4.2	$ 17.6
Purchases	24.5
Transfers into (out of) Level 3	0	0
Redemptions	0	(15.1)
Total realized/unrealized gains (losses) included in earnings	0	1.7
Ending Balance	28.7	4.2
Derivative
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	0	0
Purchases	6.2
Transfers into (out of) Level 3	0	0
Redemptions	0	0
Total realized/unrealized gains (losses) included in earnings	0	0
Ending Balance	6.2	0
Convertible Debt Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	0	0
Purchases	18.3
Transfers into (out of) Level 3	0	0
Redemptions	0	0
Total realized/unrealized gains (losses) included in earnings	0	0
Ending Balance	18.3	0
Money Market Funds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	0	10.0
Purchases	0
Transfers into (out of) Level 3	0	0
Redemptions	0	(11.7)
Total realized/unrealized gains (losses) included in earnings	0	1.7
Ending Balance	0	0
Taxable auction rate securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning Balance	4.2	7.6
Purchases	0
Transfers into (out of) Level 3	0	0
Redemptions	0	(3.4)
Total realized/unrealized gains (losses) included in earnings	0	0
Ending Balance	$ 4.2	$ 4.2

Fair Value of Derivative Instruments (Detail) (USD $) In Millions, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2011
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 18.1	$ 5.1
Derivative Liabilities	2.2	1.2
Designated as Hedging Instrument \| Foreign exchange contracts \| Prepaid expenses and other current assets
Derivatives, Fair Value [Line Items]
Derivative Assets	11.9	5.1
Designated as Hedging Instrument \| Foreign exchange contracts \| Other Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative Liabilities	2.2	1.2
Not Designated as Hedging Instrument \| Other assets
Derivatives, Fair Value [Line Items]
Derivative Assets	$ 6.2	$ 0

- Definition

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details

- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details

Effects of Derivative Instruments on Condensed Consolidated Statements of Operations (Detail) (Foreign exchange contracts, USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011
Not Designated as Hedging Instrument \| Interest and other income (expense), net
Derivative Instruments, Gain (Loss) [Line Items]
Amount and Location of Gain (Loss) Recognized in Income on Derivative	$ (1.3)	$ 2.3
Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Amount of Gain (Loss) Recognized in Accumulated OCI on Derivatives (Effective Portion)	12.8	11.8
Amount and Location of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	2.7	15.1
Designated as Hedging Instrument \| Net revenue
Derivative Instruments, Gain (Loss) [Line Items]
Amount and Location of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	(1.9)	13.0
Designated as Hedging Instrument \| Operating expenses
Derivative Instruments, Gain (Loss) [Line Items]
Amount and Location of Gain (Loss) Reclassified from Accumulated OCI into Income (Effective Portion)	4.6	2.1
Designated as Hedging Instrument \| Interest and other income (expense), net
Derivative Instruments, Gain (Loss) [Line Items]
Amount and Location of Gain (Loss) Recognized in Income on Derivatives (Ineffective Portion and Amount Excluded from Effectiveness Testing)	$ 0.3	$ 0.1

- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References+ Details

- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References+ Details

- Definition

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

+ References+ Details

- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References+ Details

Available for Sale Securities (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Derivative Instruments and Hedging Activities Disclosure [Line Items]
Available-for-sale securities gross gains (losses)		$ 1.7
Proceeds from Sale and Maturity of Marketable Securities	559.1	410.7	355.1
Notional amount of foreign currency option collar and forward contracts designated as cash flow hedges	419.6	345.5
Net loss expected to be recognized into earnings	(9.2)	0.8	(2.3)
Notional amount of foreign currency forward contracts not designated as cash flow hedges	$ 75.1	$ 56.1

- Definition

Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Includes an entity's share of an equity investee's Increase or Decrease in deferred hedging gains or losses.

+ References+ Details

- Definition

The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 15

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 16

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 16

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585

+ Details

Schedule Of Share-based Compensation Options Activity (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified

12 Months Ended

Jan. 31, 2012

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share based compensation arrangement by share based payment award options expiration term

Number of Shares

Options outstanding at January 31, 2011

30.4

Granted

5.4

Exercised

(5.3)

Cancelled

(2.1)

Options outstanding at January 31, 2012

28.4

Options exercisable at January 31, 2012

16.7

Options vested and exercisable as of January 31, 2012

27.7

^[1]

Options available for grant at January 31, 2012

18.0

Weighted average price per share

Options outstanding at January 31, 2011

$ 28.93

Granted

$ 40.71

Exercised

$ 24.85

Cancelled

$ 36.29

Options outstanding at January 31, 2012

$ 31.39

Options exercisable at January 31, 2012

$ 30.98

Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price

$ 31.25

^[1]

Outside directors stock plan 2012

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share based compensation arrangement by share based payment award options expiration term

Maximum | Employee Stock Plan 2012

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Share based compensation arrangement by share based payment award options expiration term

[1]	Options expected to vest reflect an estimated forfeiture rate. The weighted average remaining contractual life for these options is 3.9 years and the aggregate intrinsic value is $199.3 million.

Intrinsic Value of Options Exercised and Weighted Average Grant Date Fair Value of Stock Options Granted (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified

12 Months Ended

Jan. 31, 2012

Jan. 31, 2011

Jan. 31, 2010

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Intrinsic value of options exercised

$ 85.7

^[1]

$ 61.9

^[1]

$ 18.8

^[1]

Weighted average grant date fair value per share of stock options granted

$ 14.04

^[2]

$ 9.30

^[2]

$ 6.13

^[2]

[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.
[2]	The weighted average grant date fair value per share of stock options granted is calculated, as of the stock option grant date, using the BSM option pricing model.

Options Outstanding and Exercisable (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified

Jan. 31, 2012

Year

Jan. 31, 2011

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Options Exercisable - Number of Shares

16.7

Options Exercisable - Weighted average contractual life (in years)

2.1

Options Exercisable - Weighted average exercise price

$ 30.98

Options Exercisable - Aggregate intrinsic value

$ 127.7

Options Outstanding - Number of Shares

28.4

30.4

Options Outstanding - Weighted average contractual life (in years)

4.0

Options Outstanding - Weighted average exercise price

$ 31.39

$ 28.93

Options Outstanding - Aggregate intrinsic value

$ 201.3

^[1]

Range 1

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Range of per-share exercise prices, Lower Limit

$ 2.28

Range of per-share exercise prices, Upper Limit

$ 17.37

Options Exercisable - Number of Shares

3.8

Options Exercisable - Weighted average exercise price

$ 12.94

Options Outstanding - Number of Shares

5.8

Options Outstanding - Weighted average exercise price

$ 13.61

Range 2

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Range of per-share exercise prices, Lower Limit

$ 17.39

Range of per-share exercise prices, Upper Limit

$ 29.49

Options Exercisable - Number of Shares

2.6

Options Exercisable - Weighted average exercise price

$ 25.81

Options Outstanding - Number of Shares

6.1

Options Outstanding - Weighted average exercise price

$ 27.64

Range 3

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Range of per-share exercise prices, Lower Limit

$ 29.50

Range of per-share exercise prices, Upper Limit

$ 37.16

Options Exercisable - Number of Shares

4.4

Options Exercisable - Weighted average exercise price

$ 32.94

Options Outstanding - Number of Shares

6.0

Options Outstanding - Weighted average exercise price

$ 32.72

Range 4

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Range of per-share exercise prices, Lower Limit

$ 37.26

Range of per-share exercise prices, Upper Limit

$ 41.62

Options Exercisable - Number of Shares

2.0

Options Exercisable - Weighted average exercise price

$ 38.40

Options Outstanding - Number of Shares

5.9

Options Outstanding - Weighted average exercise price

$ 40.46

Range 5

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Range of per-share exercise prices, Lower Limit

$ 42.01

Range of per-share exercise prices, Upper Limit

$ 49.80

Options Exercisable - Number of Shares

3.9

Options Exercisable - Weighted average exercise price

$ 45.69

Options Outstanding - Number of Shares

4.6

Options Outstanding - Weighted average exercise price

$ 45.42

[1]	Represents the total intrinsic value, based on Autodesk’s closing stock price of $36.00 per share as of January 31, 2012, which would have been received by the option holders had all option holders exercised their options as of that date.

Summary of Restricted Stock Award and Restricted Stock Unit Activity (Detail) (Restricted Stock Awards and Restricted Stock Units, USD $)	12 Months Ended
	Jan. 31, 2012
Restricted Stock Awards and Restricted Stock Units
Unreleased restricted stock
Unreleased restricted stock at January 31, 2011	1,426,800
Granted	1,610,500
Released	(707,600)
Canceled	(145,600)
Unreleased restricted stock at January 31, 2012	2,184,100
Weighted average grant date fair value
Unreleased restricted stock at January 31, 2011	$ 30.43
Granted	$ 37.07
Released	$ 25.95
Forfeited	$ 32.37
Unreleased restricted stock at January 31, 2012	$ 36.65

Stock-Based Compensation Expense - Additional Information (Detail) (USD $)

12 Months Ended

Jan. 31, 2012

Jan. 31, 2011

Jan. 31, 2010

Share based compensation arrangement by share based payment award options expiration term

Share-Based Compensation Shares Granted to Share Issued

$ 2.11

Option expiration term (in years)

Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term

3.9

Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value

$ 199,300,000

Total compensation costs related to non-vested options

74,900,000

Total compensation costs related to non-vested options, expected to be recognized over a weighted average period (in years)

1.7

Sale of Stock, Price Per Share

$ 36.00

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%

Shares available for future issuance, increases on the first trading day of each fiscal year

10,000,000

Shares available for future issuance, percentage of outstanding shares plus any shares repurchased by Autodesk

2.00%

Weighted average grant date fair value

$ 14.04

^[1]

$ 9.30

^[1]

$ 6.13

^[1]

Restricted Stock Units (RSUs)

Restricted stock granted

1,594,500

Compensation expense

29,100,000

8,900,000

Total compensation cost related to non-vested awards not yet recognized

47,700,000

Total compensation cost related to non-vested awards not yet recognized, weighted average period of recognition (in years)

1.6

Number of restricted stock granted but unreleased

2,170,600

Restricted Stock Awards

Restricted stock granted

16,000

Compensation expense

600,000

700,000

Total compensation cost related to non-vested awards not yet recognized

200,000

Total compensation cost related to non-vested awards not yet recognized, weighted average period of recognition (in years)

0.4

Number of restricted stock granted but unreleased

13,500

Employee Stock Plan 2012

Shares of common stock reserved for issuance

21,200,000

Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures

15,200,000

Stock Issued During Period, Shares, Share-based Compensation, Forfeited

6,000,000

Share-Based Compensation Shares Granted to Share Issued

$ 1.79

Maximum vesting period of options and restricted stock granted

over a four year period

Shares available for future issuance

15,400,000

Employee Stock Plan 2012 | Minimum

Share based compensation arrangement by share based payment award options expiration term

Option expiration term (in years)

Employee Stock Plan 2012 | Maximum

Share based compensation arrangement by share based payment award options expiration term

Option expiration term (in years)

Outside directors stock plan 2012

Share based compensation arrangement by share based payment award options expiration term

Shares of common stock reserved for issuance

2,600,000

Maximum vesting period of options and restricted stock granted

over a four year period

Option expiration term (in years)

Shares available for future issuance

2,600,000

Minimum vesting period of options and restricted stock granted

one year

ESP Plan

Shares available for future issuance

29,700,000

Shares issued under the ESP Plan

2,800,000

3,200,000

3,100,000

Shares issued under the ESP Plan, average price

$ 18.26

$ 14.77

$ 14.41

Weighted average grant date fair value

$ 9.95

$ 10.11

$ 7.19

Employee Service Share Based Compensation recognized Compensation Costs On Nonvested Restricted Shares

$ 23,800,000

$ 18,200,000

$ 26,600,000

[1]	The weighted average grant date fair value per share of stock options granted is calculated, as of the stock option grant date, using the BSM option pricing model.

Employee and Director Stock Plans Employee and Director stock Options Outstanding (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified

Jan. 31, 2012

Jan. 31, 2011

Weighted Average Exercise Price

$ 31.39

$ 28.93

Equity Compensation Plans Approved by Security Holders

Number of securities to be issued upon exercise of outstanding options

30.2

Weighted Average Exercise Price

$ 29.38

Shares available for future issuance

47.7

^[1]

Equity Compensation Plans Not Approved by Security Holders

Number of securities to be issued upon exercise of outstanding options

0.4

^[2]

Weighted Average Exercise Price

$ 11.03

^[2]

Shares available for future issuance

Equity Compensation Plans

Number of securities to be issued upon exercise of outstanding options

30.6

Weighted Average Exercise Price

$ 29.15

Shares available for future issuance

47.7

[1]	Included in this amount are 29.7 million securities available for future issuance under Autodesk’s ESP Plan.
[2]	Amounts correspond to Autodesk’s Nonstatutory Stock Option Plan, which was terminated by the Board of Directors in December 2004.

Income Taxes Provision for income taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Oct. 31, 2010	Jul. 31, 2010	Apr. 30, 2010	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Federal
Current									$ 54.3	$ 16.0	$ 12.3
Deferred									(34.5)	(8.2)	(33.0)
State
Current									4.9	(1.5)	3.0
Deferred									1.3	7.4	7.1
Foreign
Current									55.9	48.4	34.1
Deferred									(4.3)	(2.1)	3.2
Income Tax Expense (Benefit)	$ 20.9	$ 18.5	$ 23.0	$ 15.2	$ 11.4	$ 18.1	$ 20.0	$ 10.5	$ 77.6	$ 60.0	$ 26.7

Income Taxes Differences between the U.S. statutory rate and the aggregate income tax provision (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Oct. 31, 2010	Jul. 31, 2010	Apr. 30, 2010	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Income tax provision at U. S. Federal statutory rate									$ 127.0	$ 95.2	$ 29.7
State income tax expense (benefit), net of the U.S. Federal benefit									2.8	1.4	(0.6)
Foreign income taxed at rates different from the U.S. statutory rate									(61.5)	(39.7)	(22.7)
U.S. valuation allowance									1.7	2.8	14.9
Non-deductible stock-based compensation									12.8	7.9	11.7
Research and development tax credit benefit									(6.0)	(5.6)	(4.7)
Tax benefit from closure of income tax audits and decreases in uncertain tax positions									(0.4)	(2.8)	(2.5)
Officer compensation in excess of $1.0 million									1.9	0.5	0.3
Goodwill impairment									0	0	0
Non-deductible in-process research and development charge									0	0	0
Other									(0.7)	0.3	0.6
Income Tax Expense (Benefit)	20.9	18.5	23.0	15.2	11.4	18.1	20.0	10.5	77.6	60.0	26.7
Expected Future Tax Rate
Other									$ 4.4	$ 2.1	$ 17.7

Income Taxes Components Of Deferred Tax Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2011
Income Taxes [Abstract]
Nonqualified stock options	$ 71.6	$ 69.0
Research and development tax credit carryforwards	49.3	64.0
Foreign tax credit carryforwards	0.1	16.6
Accrued compensation and benefits	35.6	33.7
Other accruals not currently deductible for tax	31.1	20.8
Purchased technology and capitalized software	20.6	25.3
Fixed assets	15.9	15.1
Tax loss carryforwards	12.4	6.3
Other	3.7	2.6
Total deferred tax assets	240.3	253.4
Less: valuation allowance	(47.5)	(42.9)
Net deferred tax assets	192.8	210.5
Tax method change on advanced payments	(6.3)	(9.4)
Unremitted earnings of foreign subsidiaries	(20.6)	(53.6)
Total deferred tax liability	(26.9)	(63.0)
Net deferred tax assets	$ 165.9	$ 147.5

Income Taxes Unrecognized Tax Benefits Reconciliation, Table (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Gross unrecognized tax benefits at the beginning of the fiscal year	$ 188.4	$ 178.2	$ 169.4
Increases for tax positions of prior years	0.4	2.0	3.1
Decreases for tax positions of prior years	(0.4)	(3.5)	(1.9)
Increases for tax positions related to the current year	14.3	13.9	11.1
Decreases for lapse of statute of limitations/audit settlements	(1.6)	(2.2)	(3.5)
Gross unrecognized tax benefits at the end of the fiscal year	$ 201.1	$ 188.4	$ 178.2

Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
Income Taxes - Additional Information (Detail) (USD $)	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010	Jan. 31, 2009
Income Taxes [Line Items]
Increase Decrease In Income taxes Payable Current	$ 31,300,000
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits	150,100,000
Income (Loss) from Continuing Operations before Income Taxes, Foreign	383,700,000	321,100,000	253,900,000
Deferred Tax Liability Not Recognized, Cumulative Amount of Temporary Difference	1,290,100,000
Deferred Tax Liability Not Recognized, Amount of Unrecognized Deferred Tax Liability	390,900,000
Net deferred tax assets	165,900,000	147,500,000
Foreign Income Tax Expense (Benefit), Continuing Operations	10,400,000	0	0
Income Tax Holiday, Income Tax Benefits Per Share	$ 0.046
Current Foreign Tax Expense (Benefit)	55,900,000	48,400,000	34,100,000
Valuation Allowance, Amount		4,900,000	20,200,000
Income Tax Reconciliation, Closure of Income Tax Audits and Changes in Uncertain Tax Positions		2,800,000	2,500,000
Gross unrecognized tax benefits	201,100,000	188,400,000	178,200,000	169,400,000
Amount of gross unrecognized tax benefits that would impact the effective tax rate, if recognized	187,800,000
Unrecognized Tax Benefits, Interest on Income Taxes Accrued	2,400,000	1,900,000	2,200,000
Deferred Federal Income Tax Expense (Benefit)	(34,500,000)	(8,200,000)	(33,000,000)
Valuation Allowance of Deferred Tax Assets California
Income Taxes [Line Items]
Valuation Allowance, Deferred Tax Asset, Change in Amount	(4,600,000)	(3,900,000)	(14,300,000)
Domestic Country
Income Taxes [Line Items]
Operating Loss Carryforwards	34,200,000
State and Local Jurisdiction
Income Taxes [Line Items]
Operating Loss Carryforwards	306,900,000
Research
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	77,800,000
Change in Tax Status
Income Taxes [Line Items]
Current Foreign Tax Expense (Benefit)	4,000,000
California State Research
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	34,300,000
Canadian
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	50,100,000
Foreign Country
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	$ 60,000,000
Minimum
Income Taxes [Line Items]
Operating Loss Carryforwards, Expiration Dates	2013
Minimum \| Federal Research
Income Taxes [Line Items]
Tax Credit Carryforward, Expiration Dates	2013
Minimum \| Canadian
Income Taxes [Line Items]
Tax Credit Carryforward, Expiration Dates	2023
Minimum \| Foreign Country
Income Taxes [Line Items]
Tax Credit Carryforward, Expiration Dates	2020
Maximum
Income Taxes [Line Items]
Operating Loss Carryforwards, Expiration Dates	2032
Maximum \| Federal Research
Income Taxes [Line Items]
Tax Credit Carryforward, Expiration Dates	2032
Maximum \| Canadian
Income Taxes [Line Items]
Tax Credit Carryforward, Expiration Dates	2032
Maximum \| Foreign Country
Income Taxes [Line Items]
Tax Credit Carryforward, Expiration Dates	2022

Acquisitions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified							12 Months Ended	1 Months Ended
	Mar. 01, 2011 Scaleform Corporation	Mar. 10, 2011 Blue Ridge Numerics, Inc	Aug. 02, 2011 Instructables Corporation	Aug. 24, 2011 TurboSquid Corporation	Oct. 14, 2011 Micro Application Packages Limited	Dec. 21, 2011 T-splines	Jan. 31, 2012 Series of Individually Immaterial Business Acquisitions	Aug. 24, 2011 Maximum
Business Acquisition [Line Items]
Business acquisition, number of acquisitions							17
Business acquisition, total cash consideration	$ 36.2	$ 41.2	$ 30.2	$ 26.0	$ 23.0	$ 23.0	$ 54.8
Related cross-licensing and commercial arrangement, expense								$ 0.2

Summary of Fair Value of Assets Acquired and Liabilities Assumed by Major Class (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Aug. 24, 2011	Aug. 24, 2011 Customer relationships	Aug. 24, 2011 Trade name	Aug. 24, 2011 User List	Aug. 24, 2011 Patent	Mar. 01, 2011 Scaleform Corporation	Mar. 01, 2011 Scaleform Corporation Developed technologies	Mar. 01, 2011 Scaleform Corporation Customer relationships	Mar. 01, 2011 Scaleform Corporation Trade name	Mar. 01, 2011 Scaleform Corporation User List	Mar. 01, 2011 Scaleform Corporation Patent	Mar. 10, 2011 Blue Ridge Numerics, Inc	Mar. 10, 2011 Blue Ridge Numerics, Inc Developed technologies	Mar. 10, 2011 Blue Ridge Numerics, Inc Customer relationships	Mar. 10, 2011 Blue Ridge Numerics, Inc Trade name	Mar. 10, 2011 Blue Ridge Numerics, Inc User List	Mar. 10, 2011 Blue Ridge Numerics, Inc Patent	Aug. 02, 2011 Instructables Corporation	Aug. 02, 2011 Instructables Corporation Developed technologies	Aug. 02, 2011 Instructables Corporation Customer relationships	Aug. 02, 2011 Instructables Corporation Trade name	Aug. 02, 2011 Instructables Corporation User List	Aug. 02, 2011 Instructables Corporation Patent	Oct. 14, 2011 Micro Application Packages Limited	Oct. 14, 2011 Micro Application Packages Limited Developed technologies	Oct. 14, 2011 Micro Application Packages Limited Customer relationships	Oct. 14, 2011 Micro Application Packages Limited Trade name	Oct. 14, 2011 Micro Application Packages Limited User List	Oct. 14, 2011 Micro Application Packages Limited Patent	Dec. 21, 2011 T-splines	Dec. 21, 2011 T-splines Developed technologies	Dec. 21, 2011 T-splines Customer relationships	Dec. 21, 2011 T-splines Trade name	Dec. 21, 2011 T-splines User List	Dec. 21, 2011 T-splines Patent	Jan. 31, 2012 Series of Individually Immaterial Business Acquisitions	Jan. 31, 2012 Series of Individually Immaterial Business Acquisitions Developed technologies	Jan. 31, 2012 Series of Individually Immaterial Business Acquisitions Customer relationships	Jan. 31, 2012 Series of Individually Immaterial Business Acquisitions Trade name	Jan. 31, 2012 Series of Individually Immaterial Business Acquisitions User List	Jan. 31, 2012 Series of Individually Immaterial Business Acquisitions Patent	Aug. 24, 2011 TurboSquid Corporation	Aug. 24, 2011 TurboSquid Corporation Developed technologies	Jan. 31, 2012 Other Entities Acquired
Business Acquisition [Line Items]
Intangible assets			$ 0	$ 0	$ 0	$ 0		$ 5.9	$ 4.4	$ 1.4	$ 0	$ 3.6		$ 6.0	$ 9.2	$ 1.1	$ 0	$ 0		$ 0.4	$ 0.2	$ 1.6	$ 5.1	$ 0		$ 2.5	$ 2.0	$ 0.9	$ 0	$ 0		$ 2.1	$ 0.7	$ 0.4	$ 0	$ 0		$ 21.7	$ 3.9	$ 1.2	$ 0	$ 0		$ 26.0
In-process research and development		0					0.6						0.6						0						0						0						0
Goodwill		0					22.6						22.3						24.4						12.7						19.8						28.3
Deferred Revenue		0					0						(1.2)						0						0						0						0
Deferred tax liability		0					(2.5)						(3.6)						(1.6)						(1.6)						0						0.2
Net tangible assets (liabilities)		0					0.2						6.8						0.1						6.5						0						(0.5)
Business Acquisition, Cost of Acquired Entity, Purchase Price							$ 36.2						$ 41.2						$ 30.2						$ 23.0						$ 23.0						$ 54.8						$ 26.0		$ 13.5
Number of Businesses Acquired	2

Deferred Compensation - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2011
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Marketable Securities	$ 447.2
Rabbi Trust
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Deferred Compensation Liability, Current and Noncurrent		31.3
Deferred compensation liability current	3.2	3.4
Deferred compensation liability non-current	28.3	27.9
Marketable Securities, Current
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Trading Securities, Fair Value Disclosure		31.3
Marketable Securities, Current \| Rabbi Trust
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Trading Securities, Fair Value Disclosure	$ 31.5

- Definition

Total debt and equity financial instruments including: (1) securities held-to-maturity, (2) trading securities, and (3) securities available-for-sale.

+ References+ Details

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Trading Securities which consist of all investments in certain debt and equity securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for which an entity has elected the fair value option. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected.

+ References+ Details

Borrowing Arrangements (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2012
Debt Disclosure [Line Items]
Unsecured revolving credit facility	$ 400.0
Unsecured revolving credit facility, option to request an increase in the amount of the credit facility up to	100.0
Extinguishment of Debt, Amount	250.0
Line of credit facility, outstanding borrowings	$ 0
Line of credit facility, expiration	May 2016

Commitments and Contingencies Future Minimum Lease Payments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Future Minimum Lease Payments [Abstract]
2013	$ 50.8
2014	41.4
2015	34.9
2016	30.0
2017	23.9
Thereafter	59.9
Operating Leases, Future Minimum Payments Due	240.9
Less: Sublease income	3.3
Operating Leases Future Minimum Payments Due Net, Total	237.6
Rent Expense	$ 53.0	$ 52.1	$ 56.8

Commitments and Contingencies Commitments and contingencies - additional Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Commitments and Contingencies - Additional Information [Abstract]
Total non cancellable purchase commitments	$ 53.5
Total non-cancellable purchase commitments, term	for periods through fiscal 2015.
Royalty expense recorded under cost of license and other revenue	$ 16.5	$ 12.8	$ 16.5

Stockholders Equity Stockholders' Equity (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Stockholders Equity Note [Line Items]
Preferred stock, shares authorized	2.0	2.0
Repurchase and retirement of common shares (in shares)	9.7	9.0	2.7
Common Stock Repurchase Program
Stockholders Equity Note [Line Items]
Repurchased shares of its common stock on the open market, average repurchase price per share	$ 33.71	$ 31.13	$ 23.63
Common Stock shares remained available for repurchase under repurchase plans	14.7
Common Stock [Member]
Stockholders Equity Note [Line Items]
Repurchase and retirement of common shares (in shares)	9.7	9.0	2.7
Repurchased shares of its common stock on the open market, value	$ 211.0	$ 138.3	$ 36.4
Retained Earnings [Member]
Stockholders Equity Note [Line Items]
Repurchased shares of its common stock on the open market, value	$ 116.4	$ 142.0	$ 26.8

- Definition

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

+ References+ Details

Interest And Other Income, net (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Component of Other Income, Nonoperating [Line Items]
Interest and investment income, net	$ 5.7	$ 10.9	$ 10.0
Gain (Loss) on foreign currency	(1.1)	(14.0)	5.0
Other Income	2.7	3.7	4.1
Interest and other income, net	$ 7.3	$ 0.6	$ 19.1

- Definition

The aggregate foreign currency transaction gain (loss) (both realized and unrealized) included in determining net income for the reporting period. Excludes foreign currency transactions designated as hedges of net investment in a foreign entity and intercompany foreign currency transactions that are of a long-term nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements. For certain enterprises, primarily banks, that are dealers in foreign exchange, foreign currency transaction gains (losses) may be disclosed as dealer gains (losses).

+ References+ Details

Accumulated Other Comprehensive Income (Loss), Net of Taxes (Detail) (USD $) In Millions, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Disclosure - Accumulated Other Comprehensive Income (Loss), Net of Taxes [Abstract]
Net gain (loss) on derivative instruments	$ 9.2	$ (0.8)	$ 2.3
Net unrealized gain on available-for-sale securities	2.6	2.4	1.5
Unfunded portion of pension plans	(8.6)	(9.8)	(5.9)
Foreign currency translation adjustments	2.7	7.6	(1.4)
Accumulated other comprehensive income (loss)	$ 5.9	$ (0.6)	$ (3.5)

- Definition

Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

+ References+ Details

- Definition

+ References+ Details

- Definition

The total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 26

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-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920

+ Details

- Definition

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 12

-Paragraph 10

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-Topic 830

-SubTopic 30

-Section 45

-Paragraph 12

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-Topic 830

-SubTopic 30

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-Paragraph 1

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-Topic 220

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-Topic 220

-SubTopic 10

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-Paragraph 13

-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e653-108580

+ Details

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

+ Details

Net Income Per Share - Additional Information (Detail) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Earnings Per Share Disclosure [Line Items]
Potentially dilutive shares excluded from the computation of diluted net income per share	12.9	19.3	21.3

- Definition

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 128

-Paragraph 13, 14

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-Number 128

-Paragraph 40

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-Topic 260

-SubTopic 10

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-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Diluted Earnings Per Share

-URI http://asc.fasb.org/extlink&oid=6510752

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Contingent Stock Agreement

-URI http://asc.fasb.org/extlink&oid=6508534

Reference 7: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Antidilution

-URI http://asc.fasb.org/extlink&oid=6505113

Reference 8: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 07-4

-Paragraph 4

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Computation of the Numerators and Denominators Used in the Basic and Diluted Net Income Per Share Amounts (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Oct. 31, 2010	Jul. 31, 2010	Apr. 30, 2010	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Numerator:
Net income	$ 72.0	$ 72.8	$ 71.2	$ 69.3	$ 61.6	$ 53.6	$ 59.9	$ 36.9	$ 285.3	$ 212.0	$ 58.0
Denominator:
Denominator for basic net income per share-weighted average shares									227.7	227.6	228.7
Effect of dilutive securities									5.6	6.6	3.4
Denominator for dilutive net income per share									233.3	234.2	232.1
Basic net income per share	$ 0.32	$ 0.32	$ 0.31	$ 0.30	$ 0.27	$ 0.24	$ 0.26	$ 0.16	$ 1.25	$ 0.93	$ 0.25
Diluted net income per share	$ 0.31	$ 0.32	$ 0.30	$ 0.29	$ 0.26	$ 0.23	$ 0.25	$ 0.16	$ 1.22	$ 0.90	$ 0.25

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Emerging Issues Task Force (EITF)

-Number 07-4

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 20

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 7

-Paragraph 18

Reference 5: http://www.xbrl.org/2003/role/presentationRef

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-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 21

-Article 9

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-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

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-Paragraph 2

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-SubTopic 10

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-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

Reference 10: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.23)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 11: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.19)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

+ References+ Details

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 6

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-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.22)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph A7

-Appendix A

Reference 4: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 38

-Subparagraph d

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-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.18)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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-Name Accounting Standards Codification

-Topic 944

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-04.19)

-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 7: http://www.xbrl.org/2003/role/presentationRef

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-Name Emerging Issues Task Force (EITF)

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-Paragraph 38

-Subparagraph a

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-Name Statement of Financial Accounting Standard (FAS)

-Number 130

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-Name Regulation S-X (SX)

-Number 210

-Article 5

-Section 03

-Paragraph 19

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-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 20

-Article 9

Reference 13: http://www.xbrl.org/2003/role/presentationRef

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

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-Glossary Net Income

-URI http://asc.fasb.org/extlink&oid=6518256

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-Topic 260

-SubTopic 10

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-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

+ Details

- Definition

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References+ Details

- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References+ Details

- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

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-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

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-Name Emerging Issues Task Force (EITF)

-Number 07-4

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Segments Information Concerning the Operations Of Reportable Segments (Details) (USD $)
In Millions, unless otherwise specified

3 Months Ended

12 Months Ended

Jan. 31, 2012

Oct. 31, 2011

Jul. 31, 2011

Apr. 30, 2011

Jan. 31, 2011

Oct. 31, 2010

Jul. 31, 2010

Apr. 30, 2010

Jan. 31, 2012

Jan. 31, 2011

Jan. 31, 2010

Revenue, Net

$ 592.4

$ 548.6

$ 546.3

$ 528.3

$ 527.7

$ 476.7

$ 472.8

$ 474.6

$ 2,215.6

$ 1,951.8

$ 1,713.7

Gross Profit

534.9

489.0

488.9

473.7

479.3

428.2

424.4

423.3

1,986.5

1,755.2

1,521.9

Depreciation and Amortization

115.5

105.4

111.5

Platform Solutions and Emerging Business

Revenue, Net

833.1

716.2

624.0

Gross Profit

788.0

678.9

589.7

Depreciation and Amortization

1.8

3.0

3.1

Architecture, Engineering And Construction

Revenue, Net

626.4

568.0

513.3

Gross Profit

569.7

517.6

465.2

Depreciation and Amortization

0.7

1.6

1.8

Manufacturing

Revenue, Net

540.3

470.0

386.9

Gross Profit

496.1

439.5

358.4

Depreciation and Amortization

1.7

2.3

2.5

Media and Entertainment

Revenue, Net

215.8

197.6

189.1

Gross Profit

174.6

153.9

144.4

Depreciation and Amortization

0.5

1.1

1.8

All Other Segments

Revenue, Net

^[1]

0.4

^[1]

Unallocated Amount to Segment

Gross Profit

(41.9)

^[2]

(34.7)

^[2]

(35.8)

^[2]

Depreciation and Amortization

$ 110.8

$ 97.4

$ 102.3

[1]	Other primarily consisted of revenue from Autodesk’s Location Services division, which Autodesk disposed of in February 2009.
[2]	Unallocated amounts primarily relate to corporate expenses and other costs and expenses that are managed outside the reportable segments, including stock-based compensation expense.

Segments Information regarding operations by geographic area (Details) (USD $)
In Millions, unless otherwise specified

3 Months Ended

12 Months Ended

Jan. 31, 2012

Oct. 31, 2011

Jul. 31, 2011

Apr. 30, 2011

Jan. 31, 2011

Oct. 31, 2010

Jul. 31, 2010

Apr. 30, 2010

Jan. 31, 2012

Jan. 31, 2011

Jan. 31, 2010

Revenue, Net

$ 592.4

$ 548.6

$ 546.3

$ 528.3

$ 527.7

$ 476.7

$ 472.8

$ 474.6

$ 2,215.6

$ 1,951.8

$ 1,713.7

Long-Lived Assets

1,003.3

^[1]

790.0

^[1]

1,003.3

^[1]

790.0

^[1]

Total Americas

Revenue, Net

798.5

701.5

654.4

Long-Lived Assets

831.7

^[1]

636.8

^[1]

831.7

^[1]

636.8

^[1]

Total Americas | U.S.

Revenue, Net

631.0

561.6

527.5

Long-Lived Assets

792.5

^[1]

571.2

^[1]

792.5

^[1]

571.2

^[1]

Total Americas | Other Americas

Revenue, Net

167.5

139.9

126.9

Long-Lived Assets

39.2

^[1]

65.6

^[1]

39.2

^[1]

65.6

^[1]

Europe Middle East And Africa

Revenue, Net

862.2

782.8

671.1

Disclosure on Geographic Areas, Long-Lived Assets in Foreign Countries

121.1

^[1]

111.3

^[1]

121.1

^[1]

111.3

^[1]

Europe Middle East And Africa | SWITZERLAND

Disclosure on Geographic Areas, Long-Lived Assets in Foreign Countries

37.7

^[1]

42.8

^[1]

37.7

^[1]

42.8

^[1]

Europe Middle East And Africa | Other Europe, Middle East and Africa [Domain]

Disclosure on Geographic Areas, Long-Lived Assets in Foreign Countries

83.4

^[1]

68.5

^[1]

83.4

^[1]

68.5

^[1]

Asia [Member]

Revenue, Net

554.9

467.5

388.2

Disclosure on Geographic Areas, Long-Lived Assets in Foreign Countries

50.5

^[1]

41.9

^[1]

50.5

^[1]

41.9

^[1]

Asia [Member] | JAPAN

Revenue, Net

240.5

200.6

171.1

Asia [Member] | Other Asia Pacific

Revenue, Net

$ 314.4

$ 266.9

$ 217.1

[1]	Long-lived assets exclude investments in subsidiaries, deferred tax assets and marketable securities.

Retirement Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Defined Contribution Plan - Savings
Pension and Other Postretirement Benefits Disclosure [Line Items]
Defined Contribution Plan, Maximum Annual Contribution Per Employee, Percent	50.00%
Defined Contribution Plan, Cost Recognized	$ 7.3	$ 6.7	$ 7.1
Foreign Pension Plans, Defined Benefit
Pension and Other Postretirement Benefits Disclosure [Line Items]
Net Liability related to the funded status of defined benefit pension plans	18.0	18.2
Defined Benefit pension Plans, projected benefit obligation	52.8	47.3
Defined Benefit Plan, Fair Value of Plan Assets	34.8	29.1
Company's Contributioin To Plan	4.2	3.5	3.4
Defined benefit pension plans, estimated future benefit payments from fiscal 2013 through 2017	10.2
Defined benefit pension plans, estimated future benefit payments from fiscal 2018 through 2022	7.9
Unfunded Defined Benefit Plan
Pension and Other Postretirement Benefits Disclosure [Line Items]
Unrealized changes in the unfunded portion of defined benefit plans	8.2	9.8
Foreign Pension Plans Defined Contribution
Pension and Other Postretirement Benefits Disclosure [Line Items]
Company's Contributioin To Plan	$ 20.4	$ 13.6	$ 13.4

Restructuring Reserve Restructuring Activities (Details) (USD $)
In Millions, unless otherwise specified

12 Months Ended

Jan. 31, 2012

Jan. 31, 2011

Jan. 31, 2010

Beginning Balance

$ 8.6

$ 19.4

Additions

13.7

Payments

(4.3)

(21.0)

Adjustments

(1.9)

^[1]

(3.5)

^[1]

Ending Balance

2.4

8.6

Current portion At January 31, 2012

1.1

^[2]

4.8

^[2]

11.4

^[2]

Non-current portion At January 31, 2012

1.3

^[2]

3.8

^[2]

8.0

^[2]

Employee Severance | RestructuringFiscal2011Plan

Beginning Balance

1.5

Additions

12.4

Payments

(1.5)

(10.6)

Adjustments

^[1]

(0.3)

^[1]

Ending Balance

1.5

Employee Severance | RestructuringFiscal2010Plan

0.8

(0.8)

^[1]

Employee Severance | RestructuringFiscal2009Plan

1.0

(0.2)

^[1]

(0.8)

^[1]

Ending Balance

Employee Severance | Otherrestructuring [Member]

0.4

(0.3)

^[1]

(0.1)

^[1]

Ending Balance

Lease Termination | RestructuringFiscal2010Plan

Beginning Balance

1.7

6.1

Additions

0.3

Payments

(1.1)

(4.3)

Adjustments

(0.3)

^[1]

(0.4)

^[1]

Ending Balance

0.3

1.7

Lease Termination | RestructuringFiscal2009Plan

Beginning Balance

2.8

8.2

Additions

1.0

Payments

(0.9)

(4.6)

Adjustments

(1.3)

^[1]

(1.8)

^[1]

Ending Balance

0.6

2.8

Lease Termination | Otherrestructuring [Member]

Beginning Balance

2.6

2.9

Additions

Payments

(0.8)

(0.2)

Adjustments

(0.3)

^[1]

(0.1)

^[1]

Ending Balance

$ 1.5

$ 2.6

[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.

- Definition

Carrying amount as of the balance sheet date of known and estimated obligations associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid in the next twelve months or in the normal operating cycle if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

+ References+ Details

- Definition

Carrying amount as of the balance sheet date of known and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, which are expected to be paid after one year or beyond the next operating cycle, if longer. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

+ References+ Details

- Definition

Amount of cash paid in the period to fully or partially settle a specified, previously accrued type of restructuring cost.

+ References+ Details

Selected Quarterly Financial Information (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Oct. 31, 2010	Jul. 31, 2010	Apr. 30, 2010	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Selected Quarterly Financial Information (Unaudited) [Abstract]
Revenue, Net	$ 592.4	$ 548.6	$ 546.3	$ 528.3	$ 527.7	$ 476.7	$ 472.8	$ 474.6	$ 2,215.6	$ 1,951.8	$ 1,713.7
Gross Profit	534.9	489.0	488.9	473.7	479.3	428.2	424.4	423.3	1,986.5	1,755.2	1,521.9
Income from operations	91.8	90.2	95.0	78.6	71.6	69.2	79.8	50.8	355.6	271.4	65.6
Provision for income taxes	(20.9)	(18.5)	(23.0)	(15.2)	(11.4)	(18.1)	(20.0)	(10.5)	(77.6)	(60.0)	(26.7)
Net income	72.0	72.8	71.2	69.3	61.6	53.6	59.9	36.9	285.3	212.0	58.0
Earnings Per Share, Basic	$ 0.32	$ 0.32	$ 0.31	$ 0.30	$ 0.27	$ 0.24	$ 0.26	$ 0.16	$ 1.25	$ 0.93	$ 0.25
Earnings Per Share, Diluted	$ 0.31	$ 0.32	$ 0.30	$ 0.29	$ 0.26	$ 0.23	$ 0.25	$ 0.16	$ 1.22	$ 0.90	$ 0.25
income from operations includes following items [Abstract]
Stock Based Compensation Expense	30.0	25.6	27.3	25.9	18.4	17.0	21.0	24.3	108.8	80.7	93.6
Amortization of acquisition realted Intangible Assets	18.6	19.3	17.8	14.6	14.3	14.1	13.6	13.9	70.3	55.9
Restructuring Charges	$ 0	$ 0	$ (1.3)	$ 0	$ 1.8	$ 0	$ 1.9	$ 7.1	$ (1.3)	$ 10.8	$ 48.2

SCHEDULE II (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
Allowance for Doubtful Accounts
Balance at the Beginning of Year	$ 4.2	$ 4.6	$ 8.6
Valuation Allowances and Reserves, Charged to Cost and Expense	2.4	(0.3)	1.7
Deductions and Write-Offs	1.1	0.1	5.7
Balance at End of Year	5.5	4.2	4.6
Allowance for Sales Returns
Balance at the Beginning of Year	10.6	11.8	12.5
Valuation Allowances and Reserves, Charged to Cost and Expense	32.7	38.9	42.9
Deductions and Write-Offs	37.5	40.1	43.6
Balance at End of Year	5.8	10.6	11.8
Business Restructuring Reserves
Balance at the Beginning of Year	8.6	19.4	43.9
Valuation Allowances and Reserves, Charged to Cost and Expense	0	13.7	48.9
Deductions and Write-Offs	6.2	24.5	73.4
Balance at End of Year	$ 2.4	$ 8.6	$ 19.4

Restructuring Reserve (Detail)	3 Months Ended
Restructuring Reserve (Detail)	Apr. 30, 2011 RestructuringFiscal2011Plan	Jul. 31, 2009 RestructuringFiscal2010Plan	Jan. 31, 2009 RestructuringFiscal2009Plan
Restructuring Cost and Reserve
Restructuring program, reduced the number of employees	200	430	700
Leased facilities that were consolidated	0	32	27

Business and Summary of Significant Accounting Policies Other Intangible Assets and Related Accumulated Amortization (Parenthetical) (Details) (USD $) In Millions, unless otherwise specified	Jan. 31, 2012	Jan. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Developed technologies, in-process research and development technology, indefinite lived	$ 1.2	$ 0