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Acquisitions - Pro Forma Operating Results (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2016 | Apr. 30, 2016 | Jan. 31, 2016 | Oct. 31, 2015 | Jul. 31, 2015 | Apr. 30, 2015 | Jan. 31, 2015 | Oct. 31, 2014 | Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 282,106 |  | $ 286,816 |  | $ 268,630 |  | $ 283,073 |  | $ 288,636 |  | $ 290,227 |  | $ 282,628 |  | $ 310,240 |  | $ 1,120,625 | $ 1,171,731 | $ 1,225,034
(Loss) earnings from continuing operations, as reported | $ 25,136 |  | $ 20,981 |  | $ 15,290 |  | $ 18,703 |  | $ (39,394) |  | $ 17,213 |  | $ 11,584 |  | $ 15,499 |  | 80,110 | 4,902 | (48,146)
Nonvoting Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
(Loss) earnings from continuing operations, as reported |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 80,110 | $ 4,902 | $ (48,238)
Basic (loss) earnings from continuing operations per Class A Common Share, as reported | $ 0.50 | [1] | $ 0.42 | [1] | $ 0.30 | [1] | $ 0.37 | [1] | $ (0.77) | [1] | $ 0.34 | [1] | $ 0.23 | [1] | $ 0.30 | [1] | $ 1.59 | $ 0.10 | $ (0.93)
Diluted (loss) earnings from continuing operations per Class A Common Share, as reported | $ 0.49 | [1] | $ 0.42 | [1] | $ 0.30 | [1] | $ 0.37 | [1] | $ (0.77) | [1] | $ 0.33 | [1] | $ 0.23 | [1] | $ 0.30 | [1] | $ 1.58 | $ 0.10 | $ (0.93)
[1] | *** The sum of the quarters does not equal the year-to-date total for fiscal 2015 due to the quarterly changes inweighted-average shares outstanding.

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