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Acquisitions - Pro Forma Operating Results (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2018 | Apr. 30, 2018 | Jan. 31, 2018 | Oct. 31, 2017 | Jul. 31, 2017 | Apr. 30, 2017 | Jan. 31, 2017 | Oct. 31, 2016 | Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 297,499 | $ 298,421 | $ 287,780 | $ 290,151 | $ 289,212 | $ 275,927 | $ 268,001 | $ 280,176 | $ 1,173,851 | $ 1,113,316 | $ 1,120,625
(Loss) earnings from continuing operations, as reported | $ 34,951 | $ 26,000 | $ 4,273 | $ 25,836 | $ 25,242 | $ 22,553 | $ 25,297 | $ 22,553 | $ 91,060 | $ 95,645 | $ 80,110
Nonvoting Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Basic (loss) earnings from continuing operations per Class A Common Share, as reported | $ 0.67 | $ 0.50 | $ 0.08 | $ 0.50 | $ 0.49 | $ 0.44 | $ 0.50 | $ 0.45 | $ 1.76 | $ 1.87 |
Diluted (loss) earnings from continuing operations per Class A Common Share, as reported | $ 0.66 | $ 0.49 | $ 0.08 | $ 0.49 | $ 0.48 | $ 0.43 | $ 0.49 | $ 0.44 | $ 1.73 | $ 1.84 |

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