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	6 Months Ended
Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
Earnings Per Share [Line Items]
Net Income (Loss) Attributable to Parent	$ 4,273	$ 25,297	$ 30,109	$ 47,850
Denominator for basic earnings (loss) from continuing operations per share for both Class A and Class B	51,698	51,054	51,569	50,844
Plus: Effect of dilutive stock options	1,021	900	982	877
Denominator for diluted net income per share for both Class A and Class B	52,719	51,954	52,551	51,721
Class A nonvoting common stock
Earnings Per Share [Line Items]
Net earnings per share, basic	$ 0.08	$ 0.50	$ 0.58	$ 0.94
Net earnings per share, diluted	$ 0.08	$ 0.49	$ 0.57	$ 0.93
Class B voting common stock
Earnings Per Share [Line Items]
Earnings from continuing operations	$ 4,273	$ (25,297)	$ (29,294)	$ (47,048)
Dilutive Securities, Effect on Basic Earnings Per Share, Dilutive Convertible Securities	0	0	16	14
Payments of Ordinary Dividends	$ 0	$ 0	$ 799	$ 788
Net earnings per share, basic	$ 0.08	$ 0.50	$ 0.57	$ 0.93
Net earnings per share, diluted	$ 0.08	$ 0.49	$ 0.56	$ 0.91

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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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