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Fair Value Measurements - Financial Assets and Liabilities Accounted for at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Oct. 31, 2018
Jul. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets $ 14,951 $ 15,460
Total Liabilities 505 3
Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 14,060 14,383
Total Liabilities 0 0
Fair Value, Inputs, Level 1 [Member] | Other Assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 14,060 14,383
Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total Assets 891 1,077
Total Liabilities 505 3
Fair Value, Inputs, Level 2 [Member] | Prepaid expenses and other current assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign exchange contracts 891 1,077
Fair Value, Inputs, Level 2 [Member] | Other current liabilities [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Foreign exchange contracts $ 505 $ 3