Segment Information - Segment Operating Profit to Income Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2026	Jan. 31, 2025	Jan. 31, 2026	Jan. 31, 2025
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	$ 62,190	$ 51,234	$ 130,162	$ 110,156
Investment and other income	805	2,125	2,517	3,359
Interest expense	(990)	(1,312)	(2,198)	(2,668)
Income before income taxes	62,005	52,047	130,481	110,847
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	69,173	57,364	147,768	125,378
Segment Reporting, Reconciling Item, Corporate Nonsegment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Administrative Costs	(6,983)	(6,130)	(17,606)	(15,222)
Investment and other income	805	2,125	2,517	3,359
Interest expense	$ (990)	$ (1,312)	$ (2,198)	$ (2,668)