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Fair Value Measurements - Carrying Amounts and Fair Values of Financial Instruments, Other than Cash and Cash Equivalents, Receivables and Accounts Payable (Detail)
$ in Thousands
Jan. 31, 2019
USD ($)
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments [Abstract]  
Long-term debt (including current portion), Carrying Amount $ 1,385,126
Long-term debt (including current portion), Fair Value $ 1,377,373