Segment Information - Net Income Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2024	Jul. 31, 2023	Jul. 31, 2022
Segment Reconciliation [Abstract]
Total profit from reportable segments	$ 267,454	$ 246,245	$ 220,365
Unallocated amounts:
Administrative costs	(24,040)	(24,802)	(27,353)
Gain (Loss) on Disposition of Business	0	3,770	0
Investment and other income	7,553	4,022	244
Interest expense	(3,126)	(3,539)	(1,276)
Income before income taxes	$ 247,841	$ 225,696	$ 191,980