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Restructuring Charges (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended
Apr. 04, 2015
employees
Sep. 30, 2014
employees
Mar. 29, 2014
Apr. 04, 2015
Mar. 29, 2014
Restructuring Cost and Reserve [Line Items]          
Expected restructuring charges $ 45,000,000us-gaap_RestructuringAndRelatedCostExpectedCost1     $ 45,000,000us-gaap_RestructuringAndRelatedCostExpectedCost1  
Charge to operations 38,487,000us-gaap_RestructuringCharges 26,800,000us-gaap_RestructuringCharges 0us-gaap_RestructuringCharges 38,232,000us-gaap_RestructuringCharges 1,067,000us-gaap_RestructuringCharges
Restructuring and Related Cost, Number of Positions Eliminated 415us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated 283us-gaap_RestructuringAndRelatedCostNumberOfPositionsEliminated      
Employee Severance and Related Benefits          
Restructuring Cost and Reserve [Line Items]          
Charge to operations       38,232,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= pmtc_EmployeeSeveranceAndRelatedBenefitsMember
 
Facility Closures and Related Costs          
Restructuring Cost and Reserve [Line Items]          
Charge to operations       $ 0us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= us-gaap_FacilityClosingMember