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Goodwill and Intangible Assets (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jan. 03, 2015
Sep. 30, 2014
Goodwill, Acquired During Period $ (180)us-gaap_GoodwillAcquiredDuringPeriod  
Acquired Intangible Assets Net Including Goodwill 1,320,013pmtc_AcquiredIntangibleAssetsNetIncludingGoodwill 1,349,400pmtc_AcquiredIntangibleAssetsNetIncludingGoodwill
Segment Software Products    
Acquired Intangible Assets Net Including Goodwill 1,254,600pmtc_AcquiredIntangibleAssetsNetIncludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pmtc_SegmentSoftwareProductsMember		 1,283,000pmtc_AcquiredIntangibleAssetsNetIncludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pmtc_SegmentSoftwareProductsMember
Segment Services    
Goodwill, Acquired During Period 0us-gaap_GoodwillAcquiredDuringPeriod
/ us-gaap_StatementBusinessSegmentsAxis
= pmtc_SegmentServicesMember		  
Acquired Intangible Assets Net Including Goodwill $ 65,400pmtc_AcquiredIntangibleAssetsNetIncludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pmtc_SegmentServicesMember		 $ 66,400pmtc_AcquiredIntangibleAssetsNetIncludingGoodwill
/ us-gaap_StatementBusinessSegmentsAxis
= pmtc_SegmentServicesMember