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Net Income per Common Share - Reconciliation of Numerator and Denominator of Basic and Diluted Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended
--- | ---
Oct. 31, 2014 | Oct. 31, 2013
Earnings Per Share [Line Items] |  |
Earnings from continuing operations | $ 15,499 | $ 18,134
Denominator for basic earnings (loss) from continuing operations per share for both Class A and Class B | 51,251 | 52,071
Plus: Effect of dilutive stock options | 62 | 348
Denominator for diluted net income per share for both Class A and Class B | 51,313 | 52,419
Class A nonvoting common stock |  |
Earnings Per Share [Line Items] |  |
Earnings from continuing operations | 15,499 | 18,089
Earnings from continuing operations per basic share | $ 0.30 | $ 0.35
Earnings from continuing operations per diluted share | $ 0.30 | $ 0.35
(Loss) earnings from discontinued operations per basic share | $ (0.03) | $ 0.11
(Loss) earnings from discontinued operations per diluted share | $ (0.04) | $ 0.11
Net earnings per share, basic | $ 0.27 | $ 0.46
Net earnings per share, diluted | $ 0.26 | $ 0.46
Class B voting common stock |  |
Earnings Per Share [Line Items] |  |
Earnings from continuing operations | 14,704 | 17,270
Earnings from continuing operations per basic share | $ 0.29 | $ 0.33
Earnings from continuing operations per diluted share | $ 0.29 | $ 0.33
(Loss) earnings from discontinued operations per basic share | $ (0.04) | $ 0.11
(Loss) earnings from discontinued operations per diluted share | $ (0.04) | $ 0.11
Net earnings per share, basic | $ 0.25 | $ 0.44
Net earnings per share, diluted | $ 0.25 | $ 0.44
Restricted Stock Dividends [Member] |  |
Earnings Per Share [Line Items] |  |
Payments of Ordinary Dividends, Common Stock | 0 | 45
Preferential Dividends on Class A Nonvoting Common Stock [Member] |  |
Earnings Per Share [Line Items] |  |
Payments of Ordinary Dividends, Common Stock | 794 | 813
Preferential Dividends on Dilutive Shares [Member] |  |
Earnings Per Share [Line Items] |  |
Payments of Ordinary Dividends, Common Stock | $ 1 | $ 6

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