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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 | 12 Months Ended
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Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2016 | Oct. 31, 2015 | Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2015
Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings from continuing operations | $ 25,242 |  | $ 22,553 |  | $ 25,297 |  | $ 22,553 |  | $ 25,136 |  | $ 20,981 |  | $ 15,290 |  | $ 18,703 |  | $ 95,645 | $ 80,110 | $ 4,902
Cash dividends on Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 41,880 | $ 40,808 | $ 40,976
Denominator for basic earnings per share for both Class A and Class B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,056 | 50,541 | 51,285
Plus: Effect of dilutive stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900 | 228 | 98
Denominator for diluted earnings per share for both Class A and Class B |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51,956 | 50,769 | 51,383
Class A Nonvoting Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from continuing operations, per basic share | $ 0.49 | [1] | $ 0.44 | [1] | $ 0.50 | [1] | $ 0.45 | [1] | $ 0.50 | [1] | $ 0.42 | [1] | $ 0.30 | [1] | $ 0.37 | [1] | $ 1.87 | $ 1.59 | $ 0.10
Earnings (loss) from continuing operations, per diluted share | $ 0.48 | [1] | $ 0.43 | [1] | $ 0.49 | [1] | $ 0.44 | [1] | $ 0.49 | [1] | $ 0.42 | [1] | $ 0.30 | [1] | $ 0.37 | [1] | 1.84 | 1.58 | 0.10
(Loss) earnings from discontinued operations, per basic share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00 | 0.00 | (0.04)
(Loss) earnings from discontinued operations, per diluted share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00 | 0.00 | (0.04)
Net earnings (loss) per share, basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.87 | 1.59 | 0.06
Net earnings (loss) per share, diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.84 | $ 1.58 | $ 0.06
Class B Voting Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 94,843 | $ 79,326 | $ 4,107
Earnings (loss) from continuing operations, per basic share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.86 | $ 1.57 | $ 0.08
Earnings (loss) from continuing operations, per diluted share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.83 | 1.56 | 0.08
(Loss) earnings from discontinued operations, per basic share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00 | 0.00 | (0.04)
(Loss) earnings from discontinued operations, per diluted share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00 | 0.00 | (0.04)
Net earnings (loss) per share, basic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.86 | 1.57 | 0.04
Net earnings (loss) per share, diluted |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.83 | $ 1.56 | $ 0.04
Preferential Dividends on Class A Nonvoting Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends on Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 788 | $ 783 | $ 794
Preferential Dividends on Dilutive Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends on Common Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14 | $ 1 | $ 1
[1] | Quarters First Second Third Fourth TotalFiscal 2016 Net sales $283,073 $268,630 $286,816 $282,106 $1,120,625Gross margin 139,349 132,892 145,443 141,089 558,773Operating income 30,102 23,589 30,784 33,403 117,878Net earnings 18,703 15,290 20,981 25,136 80,110Net earnings per Class A Nonvoting Common Share: Basic $0.37 $0.30 $0.42 $0.50 $1.59Diluted $0.37 $0.30 $0.42 $0.49 $1.58Fiscal 2017 Net sales $280,176 $268,001 $275,927 $289,212 $1,113,316Gross margin 140,358 134,158 139,909 143,867 558,292Operating income 33,208 29,962 31,550 36,295 131,015Net earnings 22,553 25,297 22,553 25,242 95,645Net earnings per Class A Nonvoting Common Share: Basic * $0.45 $0.50 $0.44 $0.49 $1.87Diluted $0.44 $0.49 $0.43 $0.48 $1.84* The sum of the quarters does not equal the year-to-date total for fiscal 2017 due to the quarterly changes in weighted-average shares outstanding.

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