Fair Value Measurements - Schedule of Fair Value, Assets Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Apr. 30, 2021	Jul. 31, 2020
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 211	$ 227,154
Deferred compensation plan mutual fund assets	46,931	47,327
Deferred compensation plan liabilities	77,289	61,290
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency forward contract asset	494	0
Interest rate swap liabilities	$ 15,782	$ 26,664