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Fair Value Measurements - Financial Assets and Liabilities Accounted for at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Apr. 30, 2020
Jul. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Long-term Debt, Current Maturities $ 48,927 $ 50,166
Long-term Debt, Fair Value 48,988 51,566
Fair Value, Inputs, Level 1 [Member] | Other Assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Trading securities 17,172 15,744
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 241 474
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 $ 1,360 $ 5