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Financial Instruments - Carrying Amounts and Fair Values of Financial Instruments, Other than Cash and Cash Equivalents, Receivables and Accounts Payable (Detail)
$ in Thousands
Jan. 31, 2018
USD ($)
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments [Abstract]  
Long-term debt, including current maturities, Carrying Amount $ 1,585,430
Foreign currency forward contracts (net), Carrying Amount (674)
Long-term debt, including current maturities, Fair Value 1,582,964
Foreign currency forward contracts (net), Fair Value $ (674)