Fair Value Measurements - Schedule of Fair Value, Assets Measured on Recurring Basis (Detail) - USD ($) $ in Thousands	Jan. 31, 2021	Jul. 31, 2020
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 217	$ 227,154
Deferred compensation plan mutual fund assets	50,770	47,327
Deferred compensation plan liabilities	72,192	61,290
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest rate swap liabilities	19,319	26,664
Foreign currency forward contract liability	$ 92	$ 0