Fair Value Measurements - Schedule of Fair Value, Assets Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Oct. 31, 2020	Jul. 31, 2020
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 90,377	$ 227,154
Deferred compensation plan mutual fund assets	48,993	47,327
Deferred compensation plan liabilities	63,094	61,290
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap liability	$ 22,323	$ 26,664