Acquisitions - Pro Forma Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Business Combinations [Abstract]
Net sales	$ 2,829,652	$ 2,204,841	$ 5,529,050	$ 4,577,026
Net income	$ 139,345	$ 32,043	$ 254,461	$ 82,657
Basic earnings per common share (in dollars per share)	$ 2.52	$ 0.58	$ 4.60	$ 1.50
Diluted earnings per common share (in dollars per share)	$ 2.51	$ 0.58	$ 4.58	$ 1.49