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Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Components for Other Receivables and Current Assets [Line Items]
Other receivables and current assets	$ 175,656	$ 163,296
Accounts Receivable Portion Of Annual Lease Licenses And Software Maintenance [Member]
Components for Other Receivables and Current Assets [Line Items]
Other receivables and current assets	116,500	112,800
Taxes Receivable Related To Overpayments And Refunds [Member]
Components for Other Receivables and Current Assets [Line Items]
Other receivables and current assets	$ 39,200	$ 36,000

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 557,846	$ 471,828
Short-term investments	599	576
Accounts receivable, less allowance for doubtful accounts of $4,000 and $4,101, respectively	79,506	84,602
Other receivables and current assets	175,656	163,296
Deferred income taxes	17,195	19,731
Total current assets	830,802	740,033
Property and equipment, net	46,809	45,638
Goodwill	1,229,629	1,225,375
Other intangible assets, net	365,622	383,420
Other long-term assets	34,863	46,942
Deferred income taxes	9,333	7,062
Total assets	2,517,058	2,448,470
Current liabilities:
Current portion of long-term debt and capital lease obligations	90,355	74,423
Accounts payable	5,572	6,987
Accrued bonuses and commissions	16,678	36,164
Accrued income taxes	7,669	6,213
Other accrued expenses and liabilities	55,053	55,809
Deferred revenue	281,689	259,155
Total current liabilities	457,016	438,751
Long-term liabilities:
Long-term debt and capital lease obligations, less current portion	26,574	53,149
Deferred income taxes	105,042	101,618
Other long-term liabilities	107,533	100,479
Total long-term liabilities	239,149	255,246
Commitments and contingencies	0	0
Stockholders' equity:
Preferred stock, $.01 par value; 2,000,000 shares authorized; zero shares issued or outstanding	0	0
Common stock, $.01 par value; 300,000,000 shares authorized; 93,064,954 and 92,651,739 shares issued, respectively	931	927
Additional paid-in capital	926,611	905,662
Retained earnings	881,547	836,008
Accumulated other comprehensive income	11,804	11,876
Total stockholders' equity	1,820,893	1,754,473
Total liabilities and stockholders' equity	$ 2,517,058	$ 2,448,470

Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Condensed Consolidated Statements Of Comprehensive Income [Abstract]
Net income	$ 45,539	$ 42,241
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	(72)	3,139
Comprehensive income	$ 45,467	$ 45,380

- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 8, 9, 10, 11, 12, 13, 14
-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 Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 30
-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 AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A5
-Appendix A

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6920043&loc=d3e557-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=6518256

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6519514

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
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-Paragraph 3
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6508144

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(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.

+ 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 Emerging Issues Task Force (EITF)
-Number 87-21
-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 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
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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.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 10, 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 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 28, 29, 30
-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 SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 19

Reference 6: http://www.xbrl.org/2003/role/presentationRef
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-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 20
-Article 9

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-Name Accounting Standards Codification
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6518256

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Other Comprehensive Income
-URI http://asc.fasb.org/extlink&oid=6519514

Reference 10: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 2
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
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+ Details

- Definition

Adjustment that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency of the reporting entity, net of tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 24
-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 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 130
-Paragraph 14, 17, 19, 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
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 52
-Paragraph 13, 20, 31
-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
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-Publisher FASB
-Name Accounting Standards Codification
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
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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

Stock Repurchase Program (Details) - $ / shares	3 Months Ended
Stock Repurchase Program (Details) - $ / shares	Mar. 31, 2011	Mar. 31, 2012
Stock Repurchase Program [Abstract]
Number of shares repurchased under stock repurchase program	247,443
Average repurchase price per share	$ 51.34
Remaining number of shares authorized to be repurchased under stock repurchase program		3,000,000

Accounting Policies

3 Months Ended

Mar. 31, 2012

Accounting Policies [Abstract]

Accounting Policies

2. Accounting Policies

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared by ANSYS in accordance with accounting principles generally accepted in the United States for interim financial information for commercial and industrial companies and the instructions to the Quarterly Report on Form 10-Q and Rule 10-01 of Regulation S-X. Accordingly, the accompanying statements do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. The accompanying condensed consolidated financial statements should be read in conjunction with the Company's audited consolidated financial statements (and notes thereto) included in the Company's Annual Report on Form 10-K for the year ended December 31, 2011. The condensed consolidated December 31, 2011 balance sheet presented is derived from the audited December 31, 2011 balance sheet included in the most recent Annual Report on Form 10-K. In the opinion of management, all adjustments considered necessary for a fair presentation of the financial statements have been included, and all adjustments are of a normal and recurring nature. Operating results for the three months ended March 31, 2012 are not necessarily indicative of the results that may be expected for any future period.

Cash and Cash Equivalents

Cash and cash equivalents consist primarily of highly liquid investments such as deposits held at major banks and money market mutual funds. Cash equivalents are carried at cost, which approximates fair value. The Company's cash and cash equivalent balances comprise the following:

March 31, 2012

December 31, 2011

(in thousands, except percentages)

Amount

% of
Total

Amount

% of
Total

Cash accounts

279,961

50.2

289,298

61.3

Money market mutual funds

274,068

49.1

181,198

38.4

Time deposits

3,817

0.7

1,332

0.3

Total

557,846

471,828

The money market mutual fund balances reflected above are held in various funds of a single issuer.

Fair Value Measurement (Fair Value Liabilities Measured Using Significant Unobservable Inputs) (Details) - Significant Unobservable Inputs (Level 3) [Member] $ in Thousands	3 Months Ended
	Mar. 31, 2012 USD ($)
Deferred Compensation [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance - January 1, 2012	$ 2,073
Interest expense included in earnings	9
Ending balance - March 31, 2012	2,082
Contingent Consideration [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance - January 1, 2012	9,571
Interest expense included in earnings	43
Ending balance - March 31, 2012	$ 9,614

Fair Value Measurement

3 Months Ended

Mar. 31, 2012

Fair Value Measurement [Abstract]

Fair Value Measurement

9. Fair Value Measurement

The valuation hierarchy for disclosure of assets and liabilities reported at fair value prioritizes the inputs for such valuations into three broad levels:

•

Level 1: quoted prices (unadjusted) in active markets for identical assets or liabilities;

•

Level 2: quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument; or

•

Level 3: unobservable inputs based on the Company's own assumptions used to measure assets and liabilities at fair value.

A financial asset or liability's classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement.

The following tables provide the assets and liabilities carried at fair value and measured on a recurring basis:


				Fair Value Measurements at Reporting Date Using:
*(in thousands)*	March 31, 2012			Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents	$	277,885		$	274,068	$	3,817	$	0

Short-term investments	$	599		$	0	$	599	$	0

Foreign currency future	$	705		$	0	$	705	$	0


Liabilities
Contingent consideration	$	(9,614	)	$	0	$	0	$	(9,614	)

Deferred compensation	$	(2,082	)	$	0	$	0	$	(2,082	)


				Fair Value Measurements at Reporting Date Using:
*(in thousands)*	December 31, 2011			Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents	$	182,530		$	181,198	$	1,332	$	0

Short-term investments	$	576		$	0	$	576	$	0


Liabilities
Contingent consideration	$	(9,571	)	$	0	$	0	$	(9,571	)

Deferred compensation	$	(2,073	)	$	0	$	0	$	(2,073	)

The cash equivalents in the preceding tables represent money market mutual funds and time deposits.

The short-term investments in the preceding tables represent deposits held by certain foreign subsidiaries of the Company. The deposits have fixed interest rates with maturity dates ranging from three months to one year. There were no unrealized gains or losses associated with these deposits for the three months ended March 31, 2012 and 2011.

In January 2012, the Company entered into a foreign currency futures contract with a third-party U.S. financial institution, which will be settled in June 2012. The purpose of this contract is to mitigate the Company's exposure to foreign exchange risk arising from intercompany receivables from a Japanese subsidiary. As of March 31, 2012, the Company's foreign exchange future is in an asset position of $705,000. The foreign exchange futures are measured at fair value each reporting period, with gains or losses recognized in earnings.

On August 1, 2011, the Company completed its acquisition of Apache, a leading simulation software provider for advanced, low-power solutions in the electronics industry. The merger agreement included a contingent consideration arrangement that requires additional payments totaling $12.0 million to be paid by the Company in equal installments to the Apache stockholders and holders of vested Apache options on each of the first three anniversaries of the closing of the acquisition. To receive these payments, a key member of Apache's management must remain an employee of ANSYS on each of the first three anniversaries of the acquisition closing date. Management estimated that it was probable that all three payments would be made, and recorded the fair value of the contingent payments as a liability on the date of acquisition. The portion of contingent payments attributable to the key member of Apache management was determined to be deferred compensation, and is accounted for outside of the business combination. A liability of $2.1 million for deferred compensation was recorded as of

March 31, 2012 based on the net present value of the expected payments. The portion of the contingent payments attributable to other shareholders was determined to be contingent purchase price consideration and was estimated to be $9.6 million based on the net present value of the expected payments as of March 31, 2012. The net present value calculations for the deferred compensation and contingent consideration included a significant unobservable input in the assumption that all three payments will be made, and therefore the liabilities were classified as Level 3 in the fair value hierarchy.

The following table presents the changes during the three months ended March 31, 2012 in the Company's Level 3 liabilities for contingent consideration and deferred compensation that are measured at fair value on a recurring basis:


	Fair Value Measurement Using Significant Unobservable Inputs
*(in thousands)*	Contingent Consideration		Deferred Compensation
Beginning balance – January 1, 2012	$	9,571	$	2,073
Interest expense included in earnings		43		9

Ending balance – March 31, 2012	$	9,614	$	2,082

The Company had no transfers of amounts in or out of Level 1 or Level 2 fair value measurements during the three months ended March 31, 2012.

The carrying values of cash, accounts receivable, accounts payable, accrued expenses, other accrued liabilities and short-term obligations approximate their fair values because of their short-term nature. The carrying value of long-term debt approximates its fair value due to the variable interest rate underlying the Company's credit facility.

- Definition

Tabular disclosure of the fair value measurement of assets and liabilities which includes [financial] instruments measured at fair value that are classified in stockholders' equity. Such assets and liabilities may be measured on a recurring or nonrecurring basis. The disclosures which may be required or desired include: (1) for assets and liabilities measured on a recurring basis, disclosure may include: (a) the fair value measurements at the reporting date; (b) the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets or liabilities (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3); (c) for fair value measurements using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (i) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), 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); (ii) purchases, sales, issuances, and settlements (net); (iii) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs); (d) the amount of the total gains or losses for the period in subparagraph (c) (i) above included in earnings (or changes in net assets) that are attributable to the change in unrealized gains or losses relating to those assets and liabilities still held at the reporting date and a description of where those unrealized gains or losses are reported in the statement of income (or activities); (e) the valuation technique(s) used to measure fair value and a discussion of changes in valuation techniques, if any, during the period and (2) for assets and liabilities that are measured at fair value on a nonrecurring basis (for example, impaired assets) disclosure may include, in addition to (a) above: (a) the reasons for the fair value measurements recorded; (b) the same as (b) above; (c) for fair value measurements using significant unobservable inputs (Level 3), a description of the inputs and the information used to develop the inputs; and (d) the valuation technique(s) used to measure fair value and a discussion of changes, if any, in the valuation technique(s) used to measure similar assets and/or liabilities in prior periods. Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 107
-Paragraph 10
-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 157
-Paragraph 32
-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 157
-Paragraph 33
-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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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19190-110258

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-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19296-110258

+ Details

Stock-Based Compensation (Stock-Based Compensation Expense) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 7,802	$ 5,147
Related income tax benefits	(2,245)	(1,171)
Stock-based compensation expense, net of taxes	$ 5,557	$ 3,976
Basic earnings per share	$ (0.06)	$ (0.04)
Diluted earnings per share	$ (0.06)	$ (0.04)
Software Licenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 368	$ 36
Maintenance And Service [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	559	460
Selling, General And Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	3,639	2,956
Research And Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense before taxes	$ 3,236	$ 1,695

Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2012

Earnings Per Share [Abstract]

Schedule Of Earnings Per Share


	Three Months Ended
*(in thousands, except per share data)*	March 31, 2012		March 31, 2011
Net income	$	45,539	$	42,241

Weighted average shares outstanding – basic		92,817		91,767
Dilutive effect of outstanding stock options and deferred stock units		2,373		2,404

Weighted average shares outstanding – diluted		95,190		94,171

Basic earnings per share	$	0.49	$	0.46
Diluted earnings per share	$	0.48	$	0.45
Anti-dilutive options		1,530		1,176

Goodwill And Intangible Assets (Estimated Future Amortization Expense For Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Goodwill And Intangible Assets [Abstract]
Remainder of 2012	$ 50,106
2013	58,316
2014	51,731
2015	47,718
2016	40,178
2017	36,232
Thereafter	59,084
Total intangible assets subject to amortization	343,365
Indefinite-lived trademarks	22,257
Other intangible assets, net	$ 365,622	$ 383,420

Acquisitions (Tables)

3 Months Ended

Mar. 31, 2012

Acquisitions [Abstract]

Fair Value Of Consideration Transferred


*(in thousands)*
Cash	$	301,306
Contingent consideration		9,501
ANSYS replacement stock options		3,170

Total consideration transferred at fair value	$	313,977

Recognized Amounts Of Identifiable Assets Acquired And Liabilities Assumed


*(in thousands)*
Cash and short-term investments	$	31,948
Accounts receivable and other tangible assets		6,011
Developed software (7-year life)		82,500
Customer relationships (15-year life)		36,100
Contract backlog (3-year life)		13,500
Platform trade names (indefinite-lives)		21,900
Apache trade name (6-year life)		2,100
Accounts payable and other liabilities		(16,038	)
Deferred revenue		(10,100	)
Net deferred tax liabilities		(48,833	)

Total identifiable net assets	$	119,088

Goodwill	$	194,889

Geographic Information (Schedule Of Revenue By Geographic Area) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 185,345	$ 158,047
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	63,595	49,106
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	29,555	26,925
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	20,541	16,960
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	3,138	2,950
Other European [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	41,856	39,205
Other International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 26,660	$ 22,901

Fair Value Measurement (Narrative) (Details)	3 Months Ended
Fair Value Measurement (Narrative) (Details)	Mar. 31, 2012 USD ($) mo yr	Mar. 31, 2011 USD ($)	Dec. 31, 2011 USD ($)	Aug. 01, 2011 USD ($)
Fair Value Measurement [Line Items]
Unrealized gains or losses associated with deposits	$ 0	$ 0
Foreign currency exchange asset	$ 705,000
Short-term investment time deposits maturity minimum, in months \| mo	3
Short-term investment time deposits maturity maximum, in years \| yr	1
Transfer amounts in or out of Level 1 or Level 2 fair value measurements	$ 0
Deferred compensation	2,082,000		$ 2,073,000
Apache Design Solutions, Inc. [Member]
Fair Value Measurement [Line Items]
Contingent consideration arrangement, additional payments				$ 12,000,000
Contingent consideration	$ 9,600,000

Stock-Based Compensation

3 Months Ended

Mar. 31, 2012

Stock-Based Compensation [Abstract]

Stock-Based Compensation

12. Stock-based Compensation

Total stock-based compensation expense, and its net impact on basic and diluted earnings per share, is as follows:


	Three Months Ended
*(in thousands)*	March 31, 2012			March 31, 2011
Cost of sales:
Software licenses	$	368		$	36
Maintenance and service		559			460
Operating expenses:
Selling, general and administrative		3,639			2,956
Research and development		3,236			1,695

Stock-based compensation expense before taxes		7,802			5,147
Related income tax benefits		(2,245	)		(1,171	)

Stock-based compensation expense, net of taxes	$	5,557		$	3,976

Net impact on earnings per share:
Basic earnings per share	$	(0.06	)	$	(0.04	)
Diluted earnings per share	$	(0.06	)	$	(0.04	)

- 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

Fair Value Measurement (Assets And Liabilities Carried At Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 277,885	$ 182,530
Short-term investments	599	576
Foreign currency future	705
Contingent Consideration	9,614	9,571
Deferred compensation	2,082	2,073
Quoted Prices In Active Markets (Level 1) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	274,068	181,198
Short-term investments	0	0
Foreign currency future	0
Contingent Consideration	0	0
Deferred compensation	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	3,817	1,332
Short-term investments	599	576
Foreign currency future	705
Contingent Consideration	0	0
Deferred compensation	0	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Short-term investments	0	0
Foreign currency future	0
Contingent Consideration	9,614	9,571
Deferred compensation	$ 2,082	$ 2,073

- 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 investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References + Details

Long-Term Debt

3 Months Ended

Mar. 31, 2012

Long-Term Debt [Abstract]

Long-Term Debt

7. Long-Term Debt

Borrowings consist of the following:


*(in thousands)*	March 31, 2012			December 31, 2011
Term loan payable in quarterly installments with a final maturity of July 31, 2013	$	116,927		$	127,557
Capitalized lease obligations		2			15

Total		116,929			127,572
Less current portion		(90,355	)		(74,423	)

Long-term debt and capital lease obligations, net of current portion	$	26,574		$	53,149

On July 31, 2008, ANSYS borrowed $355.0 million from a syndicate of banks. The interest rate on the indebtedness provides for tiered pricing with the initial rate at the prime rate + 0.50%, or the LIBOR rate + 1.50%, with step downs permitted after the initial six months under the credit agreement down to a flat prime rate or the LIBOR rate + 0.75%. Such tiered pricing is determined by the Company's consolidated leverage ratio. The Company's consolidated leverage ratio has been reduced to the lowest pricing tier in the debt agreement. On March 31, 2012, the Company made the required quarterly principal payment of $10.6 million.

For the three months ended March 31, 2012 and 2011, the Company recorded interest expense related to the term loan at interest rates of 1.33% and 1.05%, respectively. The interest expense on the term loan and amortization related to debt financing costs were as follows:

Three Months Ended

March 31, 2012

March 31, 2011

(in thousands)

Interest
Expense

Amortization

Interest
Expense

Amortization

July 31, 2008 term loan

428

204

420

252

The interest rate on the outstanding term loan balance of $116.9 million is set for the quarter ending June 30, 2012 at 1.22%, which is based on LIBOR + 0.75%. The required future principal payments on the Company's term loan as of March 31, 2012 are scheduled as follows:


*(in thousands)*
June 30, 2012	$	10,631
September 30, 2012		26,574
December 31, 2012		26,574
March 31, 2013		26,574
July 31, 2013 (maturity)		26,574

Term loan balance payable as of March 31, 2012	$	116,927

The credit agreement includes covenants related to the consolidated leverage ratio and the consolidated fixed charge coverage ratio, as well as certain restrictions on additional investments and indebtedness.

Accounting Policies (Policy)

3 Months Ended

Mar. 31, 2012

Accounting Policies [Abstract]

Basis Of Presentation

Basis of Presentation

Cash And Cash Equivalents

Cash and Cash Equivalents

March 31, 2012

December 31, 2011

(in thousands, except percentages)

Amount

% of
Total

Amount

% of
Total

Cash accounts

279,961

50.2

289,298

61.3

Money market mutual funds

274,068

49.1

181,198

38.4

Time deposits

3,817

0.7

1,332

0.3

Total

557,846

471,828

The money market mutual fund balances reflected above are held in various funds of a single issuer.

- Definition

Disclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 1
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 7, 8, 9, 10
-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 AICPA
-Name Technical Practice Aid (TPA)
-Number 2110
-Paragraph 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 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Financial Reporting Release (FRR)
-Number 203
-Paragraph 02-03

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4273-108586

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 305
-SubTopic 10
-URI http://asc.fasb.org/subtopic&trid=2122427

+ Details

Goodwill And Intangible Assets

3 Months Ended

Mar. 31, 2012

Goodwill And Intangible Assets [Abstract]

Goodwill And Intangible Assets

8. Goodwill and Intangible Assets

During the first quarter of 2012, the Company completed the annual impairment test for goodwill and intangible assets with indefinite lives and determined that these assets had not been impaired as of the test date, January 1, 2012. The Company performed a qualitative assessment and as of the test date, there was sufficient evidence that it was not more likely than not that the fair values of its reporting units were less than their carrying amounts. The application of a qualitative assessment requires the Company to assess and make judgments regarding a variety of factors which potentially impact the fair value of a reporting unit including general economic conditions, industry and market-specific conditions, customer behavior, cost factors, the Company's financial performance and trends, the Company's strategies and business plans, capital requirements, management and personnel issues, and the Company's stock price, among others. The Company then considers the totality of these and other factors, placing more weight on the events and circumstances that are judged to most affect a reporting unit's fair value or the carrying amount of its net assets, to reach a qualitative conclusion regarding whether it is more likely than not that the fair value of a reporting unit exceeds its carrying amount. No events occurred or circumstances changed during the three months ended March 31, 2012 that would indicate that the fair values of the Company's reporting units are below their carrying amounts.

As of March 31, 2012 and December 31, 2011, the Company's intangible assets and estimated useful lives are classified as follows:


	March 31, 2012					December 31, 2011
*(in thousands)*	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Amortized intangible assets:
Developed software and core technologies (7 – 10 years)	$	287,756	$	(152,999	)	$	287,392	$	(144,836	)
Customer lists and contract backlog (3 – 15 years)		220,990		(82,089	)		223,037		(76,630	)
Trademarks (6 – 10 years)		102,613		(32,906	)		102,580		(30,380	)

Total	$	611,359	$	(267,994	)	$	613,009	$	(251,846	)

Unamortized intangible assets:
Trademarks	$	22,257				$	22,257

Amortization expense for the intangible assets reflected above was $16.6 million and $11.5 million for the three months ended March 31, 2012 and 2011, respectively.

As of March 31, 2012, estimated future amortization expense for the intangible assets reflected above is as follows:


*(in thousands)*
Remainder of 2012	$	50,106
2013		58,316
2014		51,731
2015		47,718
2016		40,178
2017		36,232
Thereafter		59,084

Total intangible assets subject to amortization		343,365
Indefinite-lived trademarks		22,257

Other intangible assets, net	$	365,622

The changes in goodwill during the three months ended March 31, 2012 are as follows:


*(in thousands)*
Beginning balance – January 1, 2012	$	1,225,375
Currency translation and other		4,254

Ending balance – March 31, 2012	$	1,229,629

The first quarter 2012 change in goodwill above includes a $4.6 million increase to the net deferred tax liabilities of Apache as of the August 1, 2011 acquisition date. These measurement period adjustments were based on new information about what was known and knowable at the acquisition date in the calculation of the net deferred tax liabilities.

- Definition

The entire disclosure for the aggregate amount of goodwill and a description of intangible assets, which may include (a) for amortizable intangible assets (also referred to as finite-lived intangible assets), the carrying amount, the amount of any significant residual value, and the weighted-average amortization period, (b) for intangible assets not subject to amortization (also referred to as indefinite-lived intangible assets), the carrying amount, and (c) the amount of research and development assets acquired and written off in the period, including the line item in the income statement in which the amounts written off are aggregated, if not readily apparent from the income statement. Also discloses (a) for amortizable intangibles assets in total and by major class, the gross carrying amount and accumulated amortization, the total amortization expense for the period, and the estimated aggregate amortization expense for each of the five succeeding fiscal years, (b) for intangible assets not subject to amortization the carrying amount in total and by major class, and (c) for goodwill, in total and for each reportable segment, the changes in the carrying amount of goodwill during the period (including the aggregate amount of goodwill acquired, the aggregate amount of impairment losses recognized, and the amount of goodwill included in the gain (loss) on disposal of a reporting unit). If any part of goodwill has not been allocated to a reportable segment, discloses the unallocated amount and the reasons for not allocating. For each impairment loss recognized related to an intangible asset (excluding goodwill), discloses: (a) a description of the impaired intangible asset and the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method for determining fair value, (c) the caption in the income statement or the statement of activities in which the impairment loss is aggregated, and (d) the segment in which the impaired intangible asset is reported. For each goodwill impairment loss recognized, discloses: (a) a description of the facts and circumstances leading to the impairment, (b) the amount of the impairment loss and the method of determining the fair value of the associated reporting unit, and (c) if a recognized impairment loss is an estimate not finalized and the reasons why the estimate is not final. May also disclose the nature and amount of any significant adjustments made to a previous estimate of an impairment loss.

+ References + Details

Long-Term Debt (Schedule Of Borrowings) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Long-Term Debt [Abstract]
Term loan payable in quarterly installments with a final maturity of July 31, 2013	$ 116,927	$ 127,557
Capitalized lease obligations	2	15
Total	116,929	127,572
Less current portion	(90,355)	(74,423)
Long-term debt and capital lease obligations, net of current portion	$ 26,574	$ 53,149
Long-term debt maturity date	Jul. 31, 2013

Acquisitions (Recognized Amounts Of Identifiable Assets Acquired And Liabilities) (Details) $ in Thousands	Aug. 01, 2011 USD ($) yr	Mar. 31, 2012 USD ($)
Business Acquisition [Line Items]
Amortizable intangible assets	$ 151,700	$ 154,000
Deferred revenue		(10,100)
Net deferred tax liabilities	46,100	$ 48,800
Apache Design Solutions, Inc. [Member]
Business Acquisition [Line Items]
Cash and short-term investments	31,948
Accounts receivable and other tangible assets	6,011
Accounts payable and other liabilities	(16,038)
Deferred revenue	(10,100)
Net deferred tax liabilities	(48,833)
Total identifiable net assets	119,088
Goodwill	194,889
Apache Design Solutions, Inc. [Member] \| Developed Software [Member]
Business Acquisition [Line Items]
Amortizable intangible assets	$ 82,500
Useful life of intangible assets acquired, in years \| yr	7
Apache Design Solutions, Inc. [Member] \| Customer Relationships [Member]
Business Acquisition [Line Items]
Amortizable intangible assets	$ 36,100
Useful life of intangible assets acquired, in years \| yr	15
Apache Design Solutions, Inc. [Member] \| Contract Backlog [Member]
Business Acquisition [Line Items]
Amortizable intangible assets	$ 13,500
Useful life of intangible assets acquired, in years \| yr	3
Apache Design Solutions, Inc. [Member] \| Platform Trade Names [Member]
Business Acquisition [Line Items]
Indefinite-lived intangible assets	$ 21,900
Apache Design Solutions, Inc. [Member] \| Apache Trade Name [Member]
Business Acquisition [Line Items]
Amortizable intangible assets	$ 2,100
Useful life of intangible assets acquired, in years \| yr	6

Long-Term Debt (Future Principal Payments On Company's Term Loan) (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Debt Instrument [Line Items]
Term loan balance payable as of March 31, 2012	$ 116,927	$ 127,557
June 30, 2012 [Member]
Debt Instrument [Line Items]
Future principal payments on company's term loan, 2012	10,631
September 30, 2012 [Member]
Debt Instrument [Line Items]
Future principal payments on company's term loan, 2012	26,574
December 31, 2012 [Member]
Debt Instrument [Line Items]
Future principal payments on company's term loan, 2012	26,574
March 31, 2013 [Member]
Debt Instrument [Line Items]
Future principal payments on company's term loan, 2013	26,574
July 31, 2013 (maturity) [Member]
Debt Instrument [Line Items]
Future principal payments on company's term loan, 2013	$ 26,574

Document And Entity Information - shares	3 Months Ended
Document And Entity Information - shares	Mar. 31, 2012	Apr. 27, 2012
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1
Trading Symbol	anss
Entity Registrant Name	ANSYS INC
Entity Central Index Key	0001013462
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		93,146,587

Accounting Policies (Summary Of Cash And Cash Equivalents) (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010
Accounting Policies [Abstract]
Cash accounts, Amount	$ 279,961	$ 289,298
Money market mutual funds, Amount	274,068	181,198
Time deposits, Amount	3,817	1,332
Total	$ 557,846	$ 471,828	$ 549,934	$ 472,479
Cash accounts, % of Total	50.20%	61.30%
Money market mutual funds, % of Total	49.10%	38.40%
Time deposits, % of Total	0.70%	0.30%

- Definition

Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 8, 9
-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 SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 1
-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 7
-Footnote 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 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 7, 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 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
-URI http://asc.fasb.org/extlink&oid=6506951

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash Equivalents
-URI http://asc.fasb.org/extlink&oid=6507016

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3044-108585

+ Details

- Definition

Any certificate of deposit or savings account held by a bank or other financial institution for a short-term specified period of time. Because of their short-term, time deposits are considered highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three-years ago does not become a cash equivalent when its remaining maturity is three months.

+ References + Details

New Accounting Guidance	3 Months Ended
New Accounting Guidance	Mar. 31, 2012
New Accounting Guidance [Abstract]
New Accounting Guidance	14. New Accounting Guidance *Fair Value Measurements:* In May 2011, new accounting guidance was issued to provide a consistent definition of fair value and to ensure that the fair value measurement and disclosure requirements are similar between generally accepted accounting principles in the United States and International Financial Reporting Standards. The guidance changes certain fair value measurement principles and enhances the disclosure requirements, particularly for Level 3 fair value measurements. This guidance was adopted by the Company effective January 1, 2012, and it did not have any impact on the Company's financial position, results of operations or cash flows. *Presentation of Comprehensive Income:* In June 2011, new accounting guidance was issued regarding the presentation of comprehensive income in consolidated financial statements. This guidance requires that all non-owner changes in stockholders' equity be presented either in a single continuous statement of comprehensive income or in two separate but consecutive statements. This guidance was adopted by the Company effective January 1, 2012, and all non-owner changes in stockholders' equity were presented in a separate statement. *Testing Goodwill for Impairment:* In September 2011, new accounting guidance was issued regarding the requirement to test goodwill for impairment on at least an annual basis. Existing guidance requires that this test be performed by comparing the fair value of a reporting unit with its carrying amount, including goodwill (step one). If the fair value of a reporting unit is less than its carrying amount, then the second step of the test must be performed to measure the amount of the impairment loss, if any. Under the new guidance, an entity has 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, an entity determines it is not more likely than not that the fair value of a reporting unit is less than its carrying amount, then performing the two-step impairment test is unnecessary. However, if an entity concludes otherwise, then it is required to perform the first step of the two-step impairment test. This guidance was adopted by the Company effective January 1, 2012, and it did not have any impact on the Company's financial position, results of operations or cash flows.

- Definition

Tabular disclosure of changes in accounting principles, including adoption of new accounting pronouncements, that describes the new methods, amount and effects on financial statement line items.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 154
-Paragraph 2, 17, 18
-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 Accounting Principles Board Opinion (APB)
-Number 28
-Paragraph 23, 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 SEC
-Name Regulation S-X (SX)
-Number 210
-Section 01
-Paragraph b
-Subparagraph 6
-Article 10

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 250
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6801783&loc=d3e22499-107794

Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 2
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Indirect Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6515603

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Accounting Change
-URI http://asc.fasb.org/extlink&oid=6503790

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6507316

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Direct Effects of a Change in Accounting Principle
-URI http://asc.fasb.org/extlink&oid=6510796

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 270
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.10-01.(b)(6))
-URI http://asc.fasb.org/extlink&oid=6958853&loc=d3e46468-122699

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-Name Accounting Standards Codification
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-Paragraph 3
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Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Retrospective Application
-URI http://asc.fasb.org/extlink&oid=6523989

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-Publisher FASB
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-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6372559&loc=d3e765-108305

+ Details

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Condensed Consolidated Balance Sheets [Abstract]
Accounts receivable, allowance for doubtful accounts	$ 4,000	$ 4,101
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
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	93,064,954	92,651,739

Organization	3 Months Ended
Organization	Mar. 31, 2012
Organization [Abstract]
Organization	1. Organization ANSYS, Inc. (hereafter the "Company" or "ANSYS") develops and globally markets engineering simulation software and technologies widely used by engineers, designers, researchers and students across a broad spectrum of industries and academia, including aerospace, automotive, manufacturing, electronics, biomedical, energy and defense. In connection with its August 1, 2011 acquisition of Apache Design Solutions, Inc., which the Company subsequently renamed Apache Design, Inc. ("Apache"), the Company has reviewed the accounting guidance issued for disclosures about segments of an enterprise. As defined by the accounting guidance, the Company operates as two segments. However, the Company determined that its two operating segments are sufficiently similar and should be aggregated under the criteria provided in the related accounting guidance. Given the integrated approach to the multi-discipline problem-solving needs of the Company's customers, a single sale of software may contain components from multiple product areas and include combined technologies. The Company also has a multi-year product and integration strategy that will result in new combined products or changes to the historical product offerings. As a result, it is impracticable for the Company to provide accurate historical or current reporting among its various product lines.

Long-Term Debt (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Jan. 31, 2009	Jul. 31, 2008
Debt Instrument [Line Items]
Borrowed from syndicate of banks				$ 355.0
Quarterly principal payments	$ 10.6
Weighted average interest rate on term loan	1.33%	1.05%
July 31, 2008 Term Loan [Member]
Debt Instrument [Line Items]
Variable interest rate	1.22%
Term loan payable in quarterly installments with a final maturity of July 31, 2013	$ 116.9
July 31, 2008 Term Loan [Member] \| Prime Rate [Member]
Debt Instrument [Line Items]
Fixed portion of the variable rate				0.50%
July 31, 2008 Term Loan [Member] \| Percentage Over LIBOR [Member]
Debt Instrument [Line Items]
Fixed portion of the variable rate	0.75%		0.75%	1.50%

Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2012

Long-Term Debt [Abstract]

Schedule Of Borrowings


*(in thousands)*	March 31, 2012			December 31, 2011
Term loan payable in quarterly installments with a final maturity of July 31, 2013	$	116,927		$	127,557
Capitalized lease obligations		2			15

Total		116,929			127,572
Less current portion		(90,355	)		(74,423	)

Long-term debt and capital lease obligations, net of current portion	$	26,574		$	53,149

Schedule Of Interest Expense On Term Loan And Amortization Related To Debt Financing Cost

Three Months Ended

March 31, 2012

March 31, 2011

(in thousands)

Interest
Expense

Amortization

Interest
Expense

Amortization

July 31, 2008 term loan

428

204

420

252

Future Principal Payments On Company's Term Loan


*(in thousands)*
June 30, 2012	$	10,631
September 30, 2012		26,574
December 31, 2012		26,574
March 31, 2013		26,574
July 31, 2013 (maturity)		26,574

Term loan balance payable as of March 31, 2012	$	116,927

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Paragraph 1A
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21538-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
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Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=6584090&loc=d3e28878-108400

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
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Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(e),(f))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

+ Details

Acquisitions (Fair Value Of Consideration Transferred) (Details) - Apache Design Solutions, Inc. [Member] $ in Thousands	Aug. 01, 2011 USD ($)
Business Acquisition [Line Items]
Cash	$ 301,306
Contingent consideration	9,501
ANSYS replacement stock options	3,170
Total consideration transferred at fair value	$ 313,977

- Definition

The acquisition-date fair value of the equity interests of the acquirer, including the number of instruments or interests issued or issuable in consideration for the business combination.

+ References + Details

- Definition

Fair Value of the liabilities incurred by the acquirer to former owners of the acquiree, including the fair value of any contingent consideration. If liabilities transferred as consideration remain within the combined entity after the business combination (for example, because the assets or liabilities were transferred to the acquiree rather than to its former owners), and the acquirer therefore retains control of them; in that situation, the acquirer measures those liabilities at their carrying amounts immediately before the acquisition date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51
-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 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
-Paragraph 39, 40, 41
-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 f(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 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 25
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6405-128476

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 30
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477

+ Details

- Definition

This element represents the acquisition-date fair value of the total consideration transferred which consists of the sum of the acquisition-date fair values of the assets transferred by the acquirer, the liabilities incurred by the acquirer to former owners of the acquiree, and the equity interests issued by the acquirer.

+ References + Details

Stock Repurchase Program	3 Months Ended
Stock Repurchase Program	Mar. 31, 2012
Stock Repurchase Program [Abstract]
Stock Repurchase Program	11. Stock Repurchase Program In February 2012, the Company announced that its Board of Directors approved an increase to its authorized share repurchase program. Under the Company's stock repurchase program, the Company repurchased no shares during the three months ended March 31, 2012. During the three months ended March 31, 2011, ANSYS repurchased 247,443 shares at an average price per share of $51.34. As of March 31, 2012, 3.0 million shares remained authorized for repurchase under the program.

Goodwill And Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2012

Goodwill And Intangible Assets [Abstract]

Intangible Assets And Estimated Useful Lives


	March 31, 2012					December 31, 2011
*(in thousands)*	Gross Carrying Amount		Accumulated Amortization			Gross Carrying Amount		Accumulated Amortization
Amortized intangible assets:
Developed software and core technologies (7 – 10 years)	$	287,756	$	(152,999	)	$	287,392	$	(144,836	)
Customer lists and contract backlog (3 – 15 years)		220,990		(82,089	)		223,037		(76,630	)
Trademarks (6 – 10 years)		102,613		(32,906	)		102,580		(30,380	)

Total	$	611,359	$	(267,994	)	$	613,009	$	(251,846	)

Unamortized intangible assets:
Trademarks	$	22,257				$	22,257

Estimated Future Amortization Expense For Intangible Assets


*(in thousands)*
Remainder of 2012	$	50,106
2013		58,316
2014		51,731
2015		47,718
2016		40,178
2017		36,232
Thereafter		59,084

Total intangible assets subject to amortization		343,365
Indefinite-lived trademarks		22,257

Other intangible assets, net	$	365,622

Changes In Goodwill


*(in thousands)*
Beginning balance – January 1, 2012	$	1,225,375
Currency translation and other		4,254

Ending balance – March 31, 2012	$	1,229,629

- 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

Geographic Information

3 Months Ended

Mar. 31, 2012

Geographic Information [Abstract]

Geographic Information

10. Geographic Information

Revenue to external customers is attributed to individual countries based upon the location of the customer. Revenue by geographic area is as follows:


	Three Months Ended
*(in thousands)*	March 31, 2012		March 31, 2011
United States	$	63,595	$	49,106
Japan		29,555		26,925
Germany		20,541		16,960
Canada		3,138		2,950
Other European		41,856		39,205
Other international		26,660		22,901

Total revenue	$	185,345	$	158,047

Property and equipment by geographic area is as follows:


*(in thousands)*	March 31, 2012		December 31, 2011
United States	$	32,051	$	30,917
United Kingdom		3,153		3,077
India		3,051		3,092
Germany		2,386		1,843
France		2,237		2,388
Japan		1,251		1,447
Canada		877		938
Other European		930		957
Other international		873		979

Total property and equipment	$	46,809	$	45,638

Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2012

Accounting Policies [Abstract]

Summary Of Cash And Cash Equivalents

March 31, 2012

December 31, 2011

(in thousands, except percentages)

Amount

% of
Total

Amount

% of
Total

Cash accounts

279,961

50.2

289,298

61.3

Money market mutual funds

274,068

49.1

181,198

38.4

Time deposits

3,817

0.7

1,332

0.3

Total

557,846

471,828

Condensed Consolidated Statements Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Revenue:
Software licenses	$ 113,554	$ 95,867
Maintenance and service	71,791	62,180
Total revenue	185,345	158,047
Cost of sales:
Software licenses	5,996	2,894
Amortization	10,214	7,498
Maintenance and service	18,132	16,190
Total cost of sales	34,342	26,582
Gross profit	151,003	131,465
Operating expenses:
Selling, general and administrative	45,249	40,476
Research and development	31,501	24,698
Amortization	6,425	4,017
Total operating expenses	83,175	69,191
Operating income	67,828	62,274
Interest expense	(818)	(803)
Interest income	901	695
Other expense, net	(616)	(514)
Income before income tax provision	67,295	61,652
Income tax provision	21,756	19,411
Net income	$ 45,539	$ 42,241
Earnings per share - basic:
Basic earnings per share	$ 0.49	$ 0.46
Weighted average shares - basic	92,817	91,767
Earnings per share - diluted:
Diluted earnings per share	$ 0.48	$ 0.45
Weighted average shares - diluted	95,190	94,171

Contingencies And Commitments	3 Months Ended
Contingencies And Commitments	Mar. 31, 2012
Contingencies And Commitments [Abstract]
Contingencies And Commitments	13. Contingencies and Commitments The Company is subject to various investigations, claims and legal proceedings that arise in the ordinary course of business, including alleged infringement of intellectual property rights, commercial disputes, labor and employment matters, tax audits and other matters. In the opinion of the Company, the resolution of pending matters is not expected to have a material, adverse effect on the Company's consolidated results of operations, cash flows or financial position. However, each of these matters is subject to various uncertainties and it is possible that an unfavorable resolution of one or more of these proceedings could materially affect the Company's results of operations, cash flows or financial position. The Company sells software licenses and services to its customers under proprietary software license agreements. Each license agreement contains the relevant terms of the contractual arrangement with the customer, and generally includes certain provisions for indemnifying the customer against losses, expenses and liabilities from damages that are incurred by or awarded against the customer in the event the Company's software or services are found to infringe upon a patent, copyright, or other proprietary right of a third party. To date, the Company has not had to reimburse any of its customers for any losses related to these indemnification provisions and no material claims asserted under these indemnification provisions are outstanding as of March 31, 2012. For several reasons, including the lack of prior material indemnification claims, the Company cannot determine the maximum amount of potential future payments, if any, related to such indemnification provisions.

- Definition

The entire disclosure for commitments and contingencies.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Interpretation (FIN)
-Number 14
-Paragraph 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 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 9, 10, 11, 12
-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 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.25)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6398077&loc=d3e12565-110249

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6449706&loc=d3e16207-108621

+ Details

Geographic Information (Tables)

3 Months Ended

Mar. 31, 2012

Geographic Information [Abstract]

Schedule Of Revenue By Geographic Area


	Three Months Ended
*(in thousands)*	March 31, 2012		March 31, 2011
United States	$	63,595	$	49,106
Japan		29,555		26,925
Germany		20,541		16,960
Canada		3,138		2,950
Other European		41,856		39,205
Other international		26,660		22,901

Total revenue	$	185,345	$	158,047

Schedule Of Property And Equipment By Geographic Area


*(in thousands)*	March 31, 2012		December 31, 2011
United States	$	32,051	$	30,917
United Kingdom		3,153		3,077
India		3,051		3,092
Germany		2,386		1,843
France		2,237		2,388
Japan		1,251		1,447
Canada		877		938
Other European		930		957
Other international		873		979

Total property and equipment	$	46,809	$	45,638

Acquisitions

3 Months Ended

Mar. 31, 2012

Acquisitions [Abstract]

Acquisitions

3. Acquisitions

On August 1, 2011, the Company completed its acquisition of Apache, a leading simulation software provider for advanced, low-power solutions in the electronics industry. Under the terms of the merger agreement, ANSYS acquired 100% of the outstanding shares of Apache for a purchase price of $314.0 million, which included $31.9 million in acquired cash and short-term investments on Apache's balance sheet, $3.2 million in ANSYS replacement stock option awards issued to holders of partially-vested Apache stock options and $9.5 million in contingent consideration that is based on the retention of a key member of Apache's management. The Company funded the transaction entirely with existing cash balances. The operating results of Apache have been included in the Company's condensed consolidated financial statements since the date of acquisition, August 1, 2011.

The merger agreement included a contingent consideration arrangement that requires additional payments of up to $12.0 million to be paid by the Company in equal installments to the Apache stockholders and holders of vested Apache options on each of the first three anniversaries of the closing of the acquisition. To receive these payments, a key member of Apache's management must remain an employee of ANSYS on each of the first three anniversaries of the acquisition closing date. Management estimated that it was probable that all three payments would be made, and recorded the fair value of the contingent payments as a liability on the date of acquisition. The portion of contingent payments attributable to the key member of Apache management was determined to be compensation, and is accounted for outside of the business combination. The portion of the contingent payments attributable to other shareholders was determined to be contingent purchase price consideration and was estimated to be $9.5 million based on the net present value of the expected payments. Refer to Note 8 for a description of the valuation technique and inputs used to estimate the fair value of the contingent consideration.

In accordance with the merger agreement, the Company granted performance-based restricted stock units to key members of Apache management and employees, with a maximum value of $13.0 million to be earned annually over a three-fiscal-year period beginning January 1, 2012. Vesting of the full award or a portion thereof is determined discretely for each of the three fiscal years based on the achievement of certain revenue and operating income targets by the Apache subsidiary, and the recipient's continued employment through the measurement period. The value of each restricted stock unit on the August 1, 2011 grant date was $50.30, the closing price of ANSYS stock as of that date. Stock-based compensation expense based on the fair value of the awards will be recorded from the January 1, 2012 service inception date through the conclusion of the three-year measurement period based on management's estimates concerning the probability of vesting. As of March 31, 2012, the Company had determined it was probable that at least a portion of these awards would vest, and recorded stock-based compensation expense in the amount of $980,000 for the three months ended March 31, 2012.

Under the merger agreement, holders of partially-vested Apache options at the date of acquisition received options to purchase ANSYS shares of common stock based on an agreed-upon conversion ratio ("the Replacement Awards"). The value of the Replacement Awards attributable to pre-combination service was estimated to be $3.2 million at the acquisition date, and was included in consideration transferred. The value of the Replacement Awards attributable to post-combination service is recognized as stock-based compensation in earnings during the post-acquisition period.

In valuing deferred revenue on the Apache balance sheet as of the acquisition date, the Company applied the fair value provisions applicable to the accounting for business combinations. Although this acquisition accounting requirement had no impact on the Company's business or cash flow, the Company's reported revenue under accounting principles generally accepted in the United States, primarily for the first 12 months post-acquisition, will be less than the sum of what would otherwise have been reported by Apache and ANSYS absent the acquisition. Acquired deferred revenue of $10.1 million was recorded on the opening balance sheet. This amount was approximately $13.6 million lower than the historical carrying value. The impact on reported revenue for the three months ended March 31, 2012 was $2.2 million, primarily in lease license revenue. The expected impact on reported revenue is $840,000 and $3.4 million for the quarter ending June 30, 2012 and the year ending December 31, 2012, respectively.

The assets and liabilities of Apache have been recorded based on management's estimates of their fair market values as of the acquisition date. The following tables summarize the preliminary fair value of consideration transferred and the fair values of identifiable assets acquired and liabilities assumed at the acquisition date:

Fair Value of Consideration Transferred:


*(in thousands)*
Cash	$	301,306
Contingent consideration		9,501
ANSYS replacement stock options		3,170

Total consideration transferred at fair value	$	313,977

Recognized Amounts of Identifiable Assets Acquired and Liabilities Assumed:


*(in thousands)*
Cash and short-term investments	$	31,948
Accounts receivable and other tangible assets		6,011
Developed software (7-year life)		82,500
Customer relationships (15-year life)		36,100
Contract backlog (3-year life)		13,500
Platform trade names (indefinite-lives)		21,900
Apache trade name (6-year life)		2,100
Accounts payable and other liabilities		(16,038	)
Deferred revenue		(10,100	)
Net deferred tax liabilities		(48,833	)

Total identifiable net assets	$	119,088

Goodwill	$	194,889

The goodwill, which is not tax-deductible, is attributed to intangible assets that do not qualify for separate recognition, including the assembled workforce of the acquired business and the synergies expected to arise as a result of the acquisition of Apache.The fair values of the assets acquired and liabilities assumed that are listed above are based on preliminary calculations and the estimates and assumptions for these items are subject to change as additional information is obtained during the measurement period (up to one year from the acquisition date). During the measurement period since the Apache acquisition date, the Company increased the values of net deferred tax liabilities from $46.1 million to $48.8 million, and identifiable finite-lived intangible assets from $151.7 million to $154.0 million, with the offset recorded to goodwill. These adjustments were based on refinements to assumptions used in the preliminary valuation of intangible assets and new information about what was known and knowable as of the acquisition date in the calculation of the net deferred tax liabilities.

- 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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Emerging Issues Task Force (EITF)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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-Paragraph F4
-Subparagraph e

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+ Details

Uncertain Tax Positions	3 Months Ended
Uncertain Tax Positions	Mar. 31, 2012
Uncertain Tax Positions [Abstract]
Uncertain Tax Positions	5. Uncertain Tax Positions The Company reports reserves for uncertain tax positions, including estimated penalties and interest, as a component of other long-term liabilities. These amounts totaled $35.9 million and $35.5 million as of March 31, 2012 and December 31, 2011, respectively.

- Definition

Tabular disclosure of tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions.

+ References + Details

Goodwill And Intangible Assets (Changes In Goodwill) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2012 USD ($)
Goodwill And Intangible Assets [Abstract]
Beginning balance	$ 1,225,375
Currency translation and other	4,254
Ending balance	$ 1,229,629

- 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
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
-Number 141R
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-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
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-Name Statement of Financial Accounting Standard (FAS)
-Number 142
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-Clause 1
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Reference 8: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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+ 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.

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Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Name Statement of Financial Accounting Standard (FAS)
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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+ Details

Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2012

Stock-Based Compensation [Abstract]

Stock-Based Compensation Expense


	Three Months Ended
*(in thousands)*	March 31, 2012			March 31, 2011
Cost of sales:
Software licenses	$	368		$	36
Maintenance and service		559			460
Operating expenses:
Selling, general and administrative		3,639			2,956
Research and development		3,236			1,695

Stock-based compensation expense before taxes		7,802			5,147
Related income tax benefits		(2,245	)		(1,171	)

Stock-based compensation expense, net of taxes	$	5,557		$	3,976

Net impact on earnings per share:
Basic earnings per share	$	(0.06	)	$	(0.04	)
Diluted earnings per share	$	(0.06	)	$	(0.04	)

- 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

Fair Value Measurement (Tables)

3 Months Ended

Mar. 31, 2012

Fair Value Measurement [Abstract]

Assets And Liabilities Carried At Fair Value


				Fair Value Measurements at Reporting Date Using:
*(in thousands)*	March 31, 2012			Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents	$	277,885		$	274,068	$	3,817	$	0

Short-term investments	$	599		$	0	$	599	$	0

Foreign currency future	$	705		$	0	$	705	$	0


Liabilities
Contingent consideration	$	(9,614	)	$	0	$	0	$	(9,614	)

Deferred compensation	$	(2,082	)	$	0	$	0	$	(2,082	)


				Fair Value Measurements at Reporting Date Using:
*(in thousands)*	December 31, 2011			Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets
Cash equivalents	$	182,530		$	181,198	$	1,332	$	0

Short-term investments	$	576		$	0	$	576	$	0


Liabilities
Contingent consideration	$	(9,571	)	$	0	$	0	$	(9,571	)

Deferred compensation	$	(2,073	)	$	0	$	0	$	(2,073	)

Fair Value Liabilities Measured Using Significant Unobservable Inputs


	Fair Value Measurement Using Significant Unobservable Inputs
*(in thousands)*	Contingent Consideration		Deferred Compensation
Beginning balance – January 1, 2012	$	9,571	$	2,073
Interest expense included in earnings		43		9

Ending balance – March 31, 2012	$	9,614	$	2,082

- Definition

Tabular disclosure of the fair value measurement of liabilities 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 liability.

+ References + Details

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities:
Net income	$ 45,539	$ 42,241
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20,712	14,831
Deferred income tax expense	1,789	3,038
Provision for bad debts	3	94
Stock-based compensation expense	7,802	5,147
Excess tax benefits from stock options	(3,872)	(1,712)
Other	13	1
Changes in operating assets and liabilities:
Accounts receivable	5,632	6,804
Other receivables and current assets	(14,129)	1,391
Other long-term assets	5,365	(341)
Accounts payable, accrued expenses and current liabilities	(22,054)	(10,596)
Accrued income taxes	6,955	(675)
Deferred revenue	28,916	23,945
Other long-term liabilities	926	691
Net cash provided by operating activities	83,597	84,859
Cash flows from investing activities:
Capital expenditures	(4,743)	(3,341)
Purchases of short-term investments	(69)	(114)
Maturities of short-term investments	68	37
Net cash used in investing activities	(4,744)	(3,418)
Cash flows from financing activities:
Principal payments on long-term debt	(10,630)	(5,315)
Principal payments on capital leases	(9)	(32)
Purchase of treasury stock	0	(12,704)
Proceeds from issuance of common stock under Employee Stock Purchase Plan	1,116	938
Proceeds from exercise of stock options	8,053	6,172
Excess tax benefits from stock options	3,872	1,712
Net cash provided by (used in) financing activities	2,402	(9,229)
Effect of exchange rate fluctuations on cash and cash equivalents	4,763	5,243
Net increase in cash and cash equivalents	86,018	77,455
Cash and cash equivalents, beginning of period	471,828	472,479
Cash and cash equivalents, end of period	557,846	549,934
Supplemental disclosures of cash flow information:
Income taxes paid	13,023	8,769
Interest paid	$ 452	$ 489

Long-Term Debt (Schedule Of Interest Expense On Term Loan And Amortization Related To Debt Financing Cost) (Details) - July 31, 2008 Term Loan [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Debt Instrument [Line Items]
Interest Expense	$ 428	$ 420
Amortization	$ 204	$ 252

Acquisitions (Narrative) (Details)	3 Months Ended	12 Months Ended
Acquisitions (Narrative) (Details)	Mar. 31, 2012 USD ($) yr $ / shares	Dec. 31, 2011 USD ($)	Aug. 01, 2011 USD ($)
Business Acquisition [Line Items]
Business combination, goodwill recognized, description		<font style="font-family: Times New Roman;" class="_mt" size="2">The goodwill, which is not tax-deductible, is attributed to intangible assets that do not qualify for separate recognition, including the assembled workforce of the acquired business and the synergies expected to arise as a result of the acquisition of Apache.</font>
Business acquisition, incentive and provision fiscal period (in years) \| yr	3
Acquired deferred revenue	$ 10,100,000
Net deferred tax liabilities	48,800,000		$ 46,100,000
Amortizable intangible assets	154,000,000		$ 151,700,000
Nature of preliminary adjustments		These adjustments were based on refinements to assumptions used in the preliminary valuation of intangible assets and new information about what was known and knowable as of the acquisition date in the calculation of the net deferred tax liabilities.
Apache Design Solutions, Inc. [Member]
Business Acquisition [Line Items]
Business acquisition, acquisition percentage			100.00%
Business acquisition, purchase price			$ 313,977,000
Business acquisition, cash on subsidiary balance sheet			31,948,000
ANSYS replacement stock options			3,170,000
Contingent consideration			9,501,000
Business acquisition, potential performance equity awards	13,000,000
Contingent consideration arrangement, additional payments			12,000,000
Acquired deferred revenue			10,100,000
Acquired deferred revenue, amount lower than the historical carrying value recorded on the opening balance sheet		$ 13,600,000
Acquired deferred revenue, impact on reported revenue	2,200,000
Acquired deferred revenue, expected impact on reported revenue in next quarter	840,000
Acquired deferred revenue, expected impact on reported revenue in next fiscal year	$ 3,400,000
Net deferred tax liabilities			$ (48,833,000)
Apache Performance Restricted Stock Units [Member]
Business Acquisition [Line Items]
Value of each restricted stock unit on grant date \| $ / shares	$ 50.30
Stock-based compensation expense	$ 980,000

Goodwill And Intangible Assets (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2012 USD ($)
Goodwill And Intangible Assets [Abstract]
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Net Deferred Tax Assets Liabilities	$ 4.6

Uncertain Tax Positions (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Uncertain Tax Positions (Details) - USD ($) $ in Millions	Mar. 31, 2012	Dec. 31, 2011
Uncertain Tax Positions [Abstract]
Uncertain tax positions	$ 35.9	$ 35.5

Geographic Information (Schedule Of Property And Equipment By Geographic Area) (Details) - USD ($) $ in Thousands	Mar. 31, 2012	Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment	$ 46,809	$ 45,638
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment	32,051	30,917
United Kingdom [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment	3,153	3,077
India [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment	3,051	3,092
France [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment	2,237	2,388
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment	2,386	1,843
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment	1,251	1,447
Canada [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment	877	938
Other European [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment	930	957
Other International [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total property and equipment	$ 873	$ 979

Other Current Assets	3 Months Ended
Other Current Assets	Mar. 31, 2012
Other Current Assets [Abstract]
Other Current Assets	4. Other Current Assets The Company reports accounts receivable, related to the portion of annual lease licenses and software maintenance that has not yet been recognized as revenue, as a component of other receivables and current assets. These amounts totaled $116.5 million and $112.8 million as of March 31, 2012 and December 31, 2011, respectively. The Company reports income taxes receivable, including amounts related to overpayments and refunds, as a component of other receivables and current assets. These amounts totaled $39.2 million and $36.0 million as of March 31, 2012 and December 31, 2011, respectively.

Earnings Per Share (Schedule Of Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Earnings Per Share [Abstract]
Net income	$ 45,539	$ 42,241
Weighted average shares outstanding - basic	92,817	91,767
Dilutive effect of outstanding stock options and deferred stock units	2,373	2,404
Weighted average shares outstanding - diluted	95,190	94,171
Basic earnings per share	$ 0.49	$ 0.46
Diluted earnings per share	$ 0.48	$ 0.45
Anti-dilutive options	1,530	1,176

- 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
-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 128
-Paragraph 171
-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 128
-Paragraph 40
-Subparagraph c
-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 260
-SubTopic 10
-Section 50
-Paragraph 1
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-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

- 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
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 36, 37, 38
-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 SEC
-Name Regulation S-X (SX)
-Number 210
-Article 5
-Section 03
-Paragraph 20

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 7
-Paragraph 18

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Paragraph 21
-Article 9

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.21)
-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

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

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
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-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04.19)
-URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913

Reference 11: 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

- 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

+ 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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 171
-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 128
-Paragraph 40
-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 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 128
-Paragraph 8
-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 260
-SubTopic 10
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-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
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-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=6920599&loc=d3e1448-109256

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Weighted-Average Number of Common Shares Outstanding
-URI http://asc.fasb.org/extlink&oid=6528421

Reference 7: 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

Organization (Details)	3 Months Ended
Organization (Details)	Mar. 31, 2012
Organization [Abstract]
Number of operating segments	2

Earnings Per Share

3 Months Ended

Mar. 31, 2012

Earnings Per Share [Abstract]

Earnings Per Share

6. Earnings Per Share

Basic earnings per share ("EPS") amounts are computed by dividing earnings by the weighted average number of common shares outstanding during the period. Diluted EPS amounts assume the issuance of common stock for all potentially dilutive equivalents outstanding. To the extent stock options are anti-dilutive, they are excluded from the calculation of diluted EPS. The details of basic and diluted EPS are as follows:


	Three Months Ended
*(in thousands, except per share data)*	March 31, 2012		March 31, 2011
Net income	$	45,539	$	42,241

Weighted average shares outstanding – basic		92,817		91,767
Dilutive effect of outstanding stock options and deferred stock units		2,373		2,404

Weighted average shares outstanding – diluted		95,190		94,171

Basic earnings per share	$	0.49	$	0.46
Diluted earnings per share	$	0.48	$	0.45
Anti-dilutive options		1,530		1,176

Goodwill And Intangible Assets (Intangible Assets And Estimated Useful Lives) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2012 USD ($)	Mar. 31, 2011 USD ($)	Dec. 31, 2011 USD ($)
Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	$ 611,359		$ 613,009
Amortized intangible assets, Accumulated Amortization	(267,994)		(251,846)
Unamortized intangible assets, Gross Carrying Amount	22,257
Amortization expense for intangible assets	16,600	$ 11,500
Developed Software And Core Technologies [Member]
Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	287,756		287,392
Amortized intangible assets, Accumulated Amortization	$ (152,999)		(144,836)
Amortized intangible assets, Useful life minimum, in years	7
Amortized intangible assets, Useful life maximum, in years	10
Customer Lists And Contract Backlog [Member]
Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	$ 220,990		223,037
Amortized intangible assets, Accumulated Amortization	$ (82,089)		(76,630)
Amortized intangible assets, Useful life minimum, in years	3
Amortized intangible assets, Useful life maximum, in years	15
Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Amortized intangible assets, Gross Carrying Amount	$ 102,613		102,580
Amortized intangible assets, Accumulated Amortization	(32,906)		(30,380)
Unamortized intangible assets, Gross Carrying Amount	$ 22,257		$ 22,257
Amortized intangible assets, Useful life minimum, in years	6
Amortized intangible assets, Useful life maximum, in years	10