Schedule of Fair Value, Assets Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Jul. 31, 2019	Jul. 31, 2018
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 130,100	$ 230,319
Deferred compensation plan assets and liabilities	53,828	$ 43,316
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap liability	$ 12,463