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Unaudited Quarterly Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Net sales | $ 289,212 |  | $ 275,927 |  | $ 268,001 |  | $ 280,176 |  | $ 282,106 |  | $ 286,816 |  | $ 268,630 |  | $ 283,073 |  | $ 1,113,316 | $ 1,120,625 | $ 1,171,731
Gross margin | 143,867 |  | 139,909 |  | 134,158 |  | 140,358 |  | 141,089 |  | 145,443 |  | 132,892 |  | 139,349 |  | 558,292 | 558,773 | 558,432
Operating income | 36,295 | [1] | 31,550 | [1] | 29,962 | [1] | 33,208 | [1] | 33,403 | [1] | 30,784 | [1] | 23,589 | [1] | 30,102 | [1] | 131,015 | 117,878 | 35,306
Net earnings | $ 25,242 |  | $ 22,553 |  | $ 25,297 |  | $ 22,553 |  | $ 25,136 |  | $ 20,981 |  | $ 15,290 |  | $ 18,703 |  | 95,645 | 80,110 | 4,902
(Loss) earnings from discontinued operations, net of income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ (1,915)
Class A Nonvoting Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings (loss) from continuing operations per Class A Common Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earnings (loss) from continuing operations, per basic share | $ 0.49 | [2] | $ 0.44 | [2] | $ 0.50 | [2] | $ 0.45 | [2] | $ 0.50 | [2] | $ 0.42 | [2] | $ 0.30 | [2] | $ 0.37 | [2] | $ 1.87 | $ 1.59 | $ 0.10
Diluted (loss) earnings from continuing operations per Class A Common Share, as reported | $ 0.48 | [2] | $ 0.43 | [2] | $ 0.49 | [2] | $ 0.44 | [2] | $ 0.49 | [2] | $ 0.42 | [2] | $ 0.30 | [2] | $ 0.37 | [2] | 1.84 | 1.58 | 0.10
Earnings (loss) from discontinued operations per Class A Common Share: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.00 | 0.00 | (0.04)
Diluted (in dollars per share) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.00 | $ 0.00 | $ (0.04)
[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
[2] | 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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