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Goodwill and Intangible Assets (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Apr. 04, 2015
Sep. 30, 2014
Intangible Assets, Net (Including Goodwill) $ 1,286,396us-gaap_IntangibleAssetsNetIncludingGoodwill $ 1,349,400us-gaap_IntangibleAssetsNetIncludingGoodwill
Goodwill, Acquired During Period (180)us-gaap_GoodwillAcquiredDuringPeriod  
Segment Software Products    
Intangible Assets, Net (Including Goodwill) 1,222,500us-gaap_IntangibleAssetsNetIncludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pmtc_SegmentSoftwareProductsMember		 1,283,000us-gaap_IntangibleAssetsNetIncludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pmtc_SegmentSoftwareProductsMember
Segment Services    
Intangible Assets, Net (Including Goodwill) 63,900us-gaap_IntangibleAssetsNetIncludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pmtc_SegmentServicesMember		 66,400us-gaap_IntangibleAssetsNetIncludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pmtc_SegmentServicesMember
Goodwill, Acquired During Period $ 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= pmtc_SegmentServicesMember