Segment Information - Net Income Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract]
Segment profit	$ 61,071	$ 53,195	$ 160,824	$ 143,925
Unallocated amounts:
Administrative costs	(8,182)	(6,470)	(20,728)	(17,600)
Investment and other (expense) income	(1,308)	1,181	(1,343)	3,372
Interest expense	(329)	(131)	(763)	(288)
Income before income taxes and losses of unconsolidated affiliate	$ 51,252	$ 47,775	$ 137,990	$ 129,409