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Document And Entity Information (USD $)
12 Months Ended
Sep. 30, 2011
Nov. 17, 2011
Apr. 02, 2011
Document And Entity Information [Abstract]   
Document Type10-K  
Amendment Flagfalse  
Document Period End DateSep. 30, 2011
Entity Registrant NamePARAMETRIC TECHNOLOGY CORP  
Entity Central Index Key0000857005  
Current Fiscal Year End Date--09-30  
Document Fiscal Year Focus2011  
Document Fiscal Period FocusFY  
Entity Current Reporting StatusYes  
Entity Voluntary FilersNo  
Entity Well-known Seasoned IssuerYes  
Entity Filer CategoryLarge Accelerated Filer  
Entity Public Float  $ 2,638,632,650
Entity Common Stock, Shares Outstanding 118,544,930118,783,023