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, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Earnings Per Share [Line Items]
Net income	$ 13,633	$ 34,781	$ 84,684	$ 94,645
Denominator for basic earnings per share for both Class A and Class B	52,607	52,766	53,023	52,499
Plus: Effect of dilutive stock options	365	714	489	716
Denominator for diluted earnings per share for both Class A and Class B	52,972	53,480	53,512	53,215
Class A nonvoting common stock
Earnings Per Share [Line Items]
Net earnings per share, basic	$ 0.26	$ 0.66	$ 1.60	$ 1.80
Net earnings per share, diluted	$ 0.26	$ 0.65	$ 1.58	$ 1.78
Class B voting common stock
Earnings Per Share [Line Items]
Preferential dividends	$ 0	$ 0	$ 828	$ 815
Preferential dividends on dilutive stock options	0	0	10	(13)
Numerator for basic and diluted earnings per Class B Voting Common Share	$ 13,633	$ 34,781	$ 83,846	$ 93,817
Net earnings per share, basic	$ 0.26	$ 0.66	$ 1.58	$ 1.79
Net earnings per share, diluted	$ 0.26	$ 0.65	$ 1.57	$ 1.76

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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