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, 2024	Apr. 30, 2023	Apr. 30, 2024	Apr. 30, 2023
Earnings Per Share [Line Items]
Net income	$ 50,890	$ 48,052	$ 141,759	$ 125,479
Denominator for basic income per share for both Class A and Class B	48,004	49,653	48,294	49,755
Plus: Effect of dilutive equity awards	382	348	346	278
Denominator for diluted income per share for both Class A and Class B	48,386	50,001	48,640	50,033
Class A Nonvoting Common Stock
Earnings Per Share [Line Items]
Basic	$ 1.06	$ 0.97	$ 2.94	$ 2.52
Diluted	$ 1.05	$ 0.96	$ 2.91	$ 2.51
Class B Voting Common Stock
Earnings Per Share [Line Items]
Preferential dividends	$ 0	$ 0	$ 748	$ 769
Preferential dividends on dilutive stock options	0	0	(5)	(4)
Numerator for basic and diluted income per Class B Voting Common Share	$ 50,890	$ 48,052	$ 141,006	$ 124,706
Basic	$ 1.06	$ 0.97	$ 2.92	$ 2.51
Diluted	$ 1.05	$ 0.96	$ 2.90	$ 2.49

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