Segment Information - Segment Operating Profit to Income Before Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2025	Oct. 31, 2024
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	$ 67,972	$ 58,922
Investment and other income	1,712	1,234
Interest expense	(1,208)	(1,356)
Income before income taxes	68,476	58,800
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Operating Income (Loss)	78,595	68,014
Segment Reporting, Reconciling Item, Corporate Nonsegment
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Administrative Costs	(10,623)	(9,092)
Investment and other income	1,712	1,234
Interest expense	$ (1,208)	$ (1,356)