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
Oct. 31, 2019	Oct. 31, 2018
Earnings Per Share [Line Items]
Net income	$ 37,498	$ 30,637
Denominator for basic income per share for both Class A and Class B	53,143	52,201
Plus: Effect of dilutive equity awards	593	757
Denominator for diluted income per share for both Class A and Class B	53,736	52,958
Class A Nonvoting Common Stock
Earnings Per Share [Line Items]
Net income per share, basic	$ 0.71	$ 0.59
Net income per share, diluted	$ 0.70	$ 0.58
Class B Voting Common Stock
Earnings Per Share [Line Items]
Preferential dividends	$ (828)	$ (815)
Preferential dividends on dilutive stock options	(10)	(13)
Net income	$ 36,660	$ 29,809
Net income per share, basic	$ 0.69	$ 0.57
Net income per share, diluted	$ 0.68	$ 0.56

Earnings Per Share [Line Items]

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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of dilutive convertible securities excluding adjustments related to ESOP convertible preferred stock, stock options, and restrictive stock units.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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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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Amount after tax of income (loss) from continuing operations attributable to the parent.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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