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Acquisitions (Narrative) (Details) (USD $)
3 Months Ended7 Months Ended9 Months Ended1 Months Ended3 Months Ended9 Months Ended
Sep. 30, 2011
Aug. 01, 2011
years
Sep. 30, 2011
Sep. 30, 2011
Apache Design Solutions, Inc [Member]
Sep. 30, 2011
Apache Design Solutions, Inc [Member]
Sep. 30, 2011
Apache Design Solutions, Inc [Member]
Aug. 01, 2011
Apache Design Solutions, Inc [Member]
Business Acquisition [Line Items]       
Business acquisition, acquisition percentage      100.00%
Business acquisition, purchase price   $ 314,244,000$ 314,244,000$ 314,244,000 
Business acquisition, cash on subsidiary balance sheet   31,948,00031,948,00031,948,000 
ANSYS replacement stock options   3,170,0003,170,0003,170,000 
Business combination, goodwill recognized, description  

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.

    
Contingent consideration   9,501,0009,501,0009,501,000 
Business acquisition, incentive and provision fiscal period (in years) 3     
Business acquisition, potential performance equity awards   13,000,00013,000,00013,000,000 
Revenues of acquired business   4,400,000   
Net loss from acquired business   2,100,000   
Acquisition-related costs190,000 2,000,000    
Contingent consideration arrangement, additional payments      12,000,000
Acquired deferred revenue   10,100,00010,100,00010,100,000 
Deferred revenue, amount lesser than historical carrying value   13,600,00013,600,00013,600,000 
Acquired deferred revenue, impact on reported revenue    4,900,0004,900,000 
Acquired deferred revenue, expected impact on reported revenue of next fiscal quarter     4,700,000 
Acquired deferred revenue, expected impact on reported revenue in next fiscal year     $ 3,400,000