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Schedule of Fair Value, Assets Measured on Recurring Basis (Detail) - USD ($)
$ in Thousands
Oct. 31, 2018
Jul. 31, 2018
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 181,235 $ 230,319
Deferred compensation plan assets and liabilities 43,275 $ 43,316
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign currency forward contract liability $ 42,555