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, 2018	Oct. 31, 2017
Earnings Per Share [Line Items]
Net earnings	$ 30,637	$ 25,836
Denominator for basic earnings for both Class A and Class B	52,201	51,440
Plus: Effect of dilutive stock options	757	943
Denominator for diluted earnings per share for both Class A and Class B	52,958	52,383
Class A Nonvoting Common Stock
Earnings Per Share [Line Items]
Net earnings per share, basic	$ 0.59	$ 0.50
Net earnings per share, diluted	$ 0.58	$ 0.49
Class B Voting Common Stock
Earnings Per Share [Line Items]
Preferential dividends	$ (815)	$ (799)
Preferential dividends on dilutive stock options	(13)	(16)
Earnings from continuing operations	$ 29,809	$ 25,021
Net earnings per share, basic	$ 0.57	$ 0.49
Net earnings per share, diluted	$ 0.56	$ 0.48

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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