Net Earnings 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	9 Months Ended
Apr. 30, 2015	Apr. 30, 2014	Apr. 30, 2015	Apr. 30, 2014
Earnings Per Share [Line Items]
Earnings from continuing operations	$ 17,213	$ 20,184	$ 44,296	$ 48,835
Denominator for basic earnings (loss) from continuing operations per share for both Class A and Class B	51,301	51,933	51,275	52,071
Plus: Effect of dilutive stock options	149	67	95	233
Denominator for diluted net income per share for both Class A and Class B	51,450	52,000	51,370	52,304
Class A nonvoting common stock
Earnings Per Share [Line Items]
Earnings from continuing operations	17,213	20,168	44,296	48,759
Earnings from continuing operations per basic share	$ 0.34	$ 0.39	$ 0.86	$ 0.94
Earnings from continuing operations per diluted share	$ 0.33	$ 0.39	$ 0.86	$ 0.93
Earnings (loss) from discontinued operations per basic share	$ 0.00	$ 0.07	$ (0.03)	$ 0.30
Earnings (loss) from discontinued operations per diluted share	$ 0.00	$ 0.07	$ (0.03)	$ 0.30
Net earnings per share, basic	$ 0.34	$ 0.46	$ 0.83	$ 1.24
Net earnings per share, diluted	$ 0.33	$ 0.46	$ 0.83	$ 1.23
Class B voting common stock
Earnings Per Share [Line Items]
Earnings from continuing operations	17,213	20,168	43,501	47,940
Earnings from continuing operations per basic share	$ 0.34	$ 0.39	$ 0.85	$ 0.92
Earnings from continuing operations per diluted share	$ 0.33	$ 0.39	$ 0.85	$ 0.92
Earnings (loss) from discontinued operations per basic share	$ 0.00	$ 0.07	$ (0.04)	$ 0.30
Earnings (loss) from discontinued operations per diluted share	$ 0.00	$ 0.07	$ (0.04)	$ 0.29
Net earnings per share, basic	$ 0.34	$ 0.46	$ 0.81	$ 1.22
Net earnings per share, diluted	$ 0.33	$ 0.46	$ 0.81	$ 1.21
Restricted Stock Dividends [Member]
Earnings Per Share [Line Items]
Less: Dividends	0	16	0	76
Preferential Dividends on Class A Nonvoting Common Stock [Member]
Earnings Per Share [Line Items]
Less: Dividends	0	0	794	813
Preferential Dividends on Dilutive Shares [Member]
Earnings Per Share [Line Items]
Less: Dividends	$ 0	$ 0	$ 1	$ 6

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Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.

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