Segment Information - Net Income Reconciliation (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2023	Jan. 31, 2022	Jan. 31, 2023	Jan. 31, 2022
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Abstract]
Segment profit	$ 53,633	$ 48,644	$ 111,536	$ 99,753
Unallocated amounts:
Administrative costs	(4,852)	(5,772)	(11,369)	(12,546)
Investment and other income (expense)	968	(578)	811	(35)
Interest expense	(1,239)	(252)	(2,133)	(434)
Income before income taxes	$ 48,510	$ 42,042	$ 98,845	$ 86,738