Net Income per Common Share - Reconciliation of Numerator and Denominator of Basic and Diluted Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2025	Apr. 30, 2024	Apr. 30, 2025	Apr. 30, 2024
Earnings Per Share [Line Items]
Net income	$ 52,263	$ 50,890	$ 139,380	$ 141,759
Denominator for basic income per share for both Class A and Class B	47,644	48,004	47,743	48,294
Plus: Effect of dilutive equity awards	422	382	453	346
Denominator for diluted income per share for both Class A and Class B	48,066	48,386	48,196	48,640
Class A Nonvoting Common Stock
Earnings Per Share [Line Items]
Basic	$ 1.10	$ 1.06	$ 2.92	$ 2.94
Diluted	$ 1.09	$ 1.05	$ 2.89	$ 2.91
Class B Voting Common Stock
Earnings Per Share [Line Items]
Preferential dividends	$ 0	$ 0	$ 736	$ 748
Preferential dividends on dilutive stock options	0	0	(8)	(5)
Numerator for basic and diluted income per Class B Voting Common Share	$ 52,263	$ 50,890	$ 138,636	$ 141,006
Basic	$ 1.10	$ 1.06	$ 2.90	$ 2.92
Diluted	$ 1.09	$ 1.05	$ 2.88	$ 2.90