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Derivative Financial Instruments (Notional Amounts Of Outstanding Forward Contracts) (Details) (Forward Contracts, USD $)
In Thousands, unless otherwise specified
Jan. 03, 2015
Sep. 30, 2014
Notional amounts $ 68,782invest_DerivativeNotionalAmount $ 116,988invest_DerivativeNotionalAmount
Canadian Dollar / U.S. Dollar    
Notional amounts 22,476invest_DerivativeNotionalAmount
/ us-gaap_CurrencyAxis
= currency_CAD
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember		 25,583invest_DerivativeNotionalAmount
/ us-gaap_CurrencyAxis
= currency_CAD
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
Euro / U.S. Dollar    
Notional amounts 22,114invest_DerivativeNotionalAmount
/ us-gaap_CurrencyAxis
= currency_EUR
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember		 61,751invest_DerivativeNotionalAmount
/ us-gaap_CurrencyAxis
= currency_EUR
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
British Pound / Euro    
Notional amounts 11,004invest_DerivativeNotionalAmount
/ us-gaap_CurrencyAxis
= currency_GBP
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember		 14,259invest_DerivativeNotionalAmount
/ us-gaap_CurrencyAxis
= currency_GBP
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
Israeli New Sheqel / U.S. Dollar    
Notional amounts 1,730invest_DerivativeNotionalAmount
/ us-gaap_CurrencyAxis
= currency_ILS
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember		 6,144invest_DerivativeNotionalAmount
/ us-gaap_CurrencyAxis
= currency_ILS
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember
All other    
Notional amounts $ 11,458invest_DerivativeNotionalAmount
/ us-gaap_CurrencyAxis
= pmtc_AllOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember		 $ 9,251invest_DerivativeNotionalAmount
/ us-gaap_CurrencyAxis
= pmtc_AllOtherMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_ForeignExchangeForwardMember