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	6 Months Ended
Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Earnings Per Share [Line Items]
Earnings from continuing operations	$ 11,584	$ 10,517	$ 27,083	$ 28,652
Denominator for basic earnings (loss) from continuing operations per share for both Class A and Class B	51,272	52,208	51,262	52,140
Plus: Effect of dilutive stock options	76	286	68	317
Denominator for diluted net income per share for both Class A and Class B	51,348	52,494	51,330	52,457
Class A nonvoting common stock
Earnings Per Share [Line Items]
Earnings from continuing operations	11,584	10,501	27,083	28,591
Earnings from continuing operations per basic share	$ 0.23	$ 0.20	$ 0.53	$ 0.55
Earnings from continuing operations per diluted share	$ 0.23	$ 0.20	$ 0.53	$ 0.55
Earnings (loss) from discontinued operations per basic share	$ 0.00	$ 0.11	$ (0.04)	$ 0.22
Earnings (loss) from discontinued operations per diluted share	$ 0.00	$ 0.11	$ (0.04)	$ 0.22
Net earnings per share, basic	$ 0.23	$ 0.31	$ 0.49	$ 0.77
Net earnings per share, diluted	$ 0.23	$ 0.31	$ 0.49	$ 0.77
Class B voting common stock
Earnings Per Share [Line Items]
Earnings from continuing operations	11,584	10,501	26,288	27,772
Earnings from continuing operations per basic share	$ 0.23	$ 0.20	$ 0.51	$ 0.53
Earnings from continuing operations per diluted share	$ 0.23	$ 0.20	$ 0.51	$ 0.53
Earnings (loss) from discontinued operations per basic share	$ 0.00	$ 0.11	$ (0.03)	$ 0.23
Earnings (loss) from discontinued operations per diluted share	$ 0.00	$ 0.11	$ (0.04)	$ 0.22
Net earnings per share, basic	$ 0.23	$ 0.31	$ 0.48	$ 0.76
Net earnings per share, diluted	$ 0.23	$ 0.31	$ 0.47	$ 0.75
Restricted Stock Dividends [Member]
Earnings Per Share [Line Items]
Less: Dividends	0	16	0	61
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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