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Long-Term Debt (United States Trade Accounts Receivable Credit Facility) - Additional Information (Detail) (United States Trade Accounts Receivable Credit Facility [Member], USD $)
3 Months Ended
Jan. 31, 2015
Sep. 30, 2013
United States Trade Accounts Receivable Credit Facility [Member]
   
Debt Instrument [Line Items]    
Senior notes issued   $ 130,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Amount borrowed under multi currency credit facility   $ 170,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember
Maturity date of credit facility 2016-09