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Derivatives - Schedule of Derivatives Foreign Currency (Detail) (Not Designated as Hedging Instrument [Member], Forward Foreign Currency Contracts [Member], USD $)
Dec. 31, 2014
Sep. 30, 2014
Not Designated as Hedging Instrument [Member] | Forward Foreign Currency Contracts [Member]
    
Derivative [Line Items]    
Notional amount, net of forward foreign currency contract no designation hedge derivatives $ 2,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1] $ 32,000,000invest_DerivativeNotionalAmount
/ us-gaap_DerivativeByNatureAxis
= us-gaap_ForwardContractsMember
/ us-gaap_HedgingDesignationAxis
= us-gaap_NondesignatedMember		 [1]
[1] (1) Cabot's forward foreign exchange contracts are denominated primarily in the Brazilian real, British pound sterling, Czech koruna, Indonesian rupiah, and Malaysian ringgit.