Stockholders' Equity (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021	Dec. 21, 2021
Equity [Abstract]
Stock-based compensation	$ 6,959	$ 7,290	$ 12,986	$ 13,058
Stock repurchase program authorized amount					$ 250,000
Purchase of treasury shares (in shares)	590,961
Average price of treasury shares acquired (in dollars per share)	$ 98.71
Purchases of treasury shares	$ 58,331		58,331
Remaining authorized repurchase amount	$ 191,669		$ 191,669