Segment Information - Segment Operating Profit to Income Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2025	Jul. 31, 2024	Jul. 31, 2023
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	$ 236,638	$ 243,414	$ 225,213
Gain (Loss) on Disposition of Business	0	0	3,770
Investment and other income	5,206	7,553	4,022
Interest expense	(4,747)	(3,126)	(3,539)
Income before income taxes	237,097	247,841	225,696
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	266,707	267,454	246,245
Segment Reporting, Reconciling Item, Corporate Nonsegment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Administrative costs	(30,069)	(24,040)	(24,802)
Gain (Loss) on Disposition of Business	0	0	3,770
Investment and other income	5,206	7,553	4,022
Interest expense	$ (4,747)	$ (3,126)	$ (3,539)