Segment Information - Net Income Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2023	Jul. 31, 2022	Jul. 31, 2021
Segment Reconciliation [Abstract]
Total profit from reportable segments	$ 246,245	$ 220,365	$ 191,992
Unallocated amounts:
Administrative costs	(24,802)	(27,353)	(24,865)
Gain (Loss) on Disposition of Business	3,770	0	0
Investment and other income	4,022	244	4,333
Interest expense	(3,539)	(1,276)	(437)
Income before income taxes and losses of unconsolidated affiliate	$ 225,696	$ 191,980	$ 171,023