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Quarterly Information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
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May 31, 2016 | Feb. 29, 2016 | Nov. 30, 2015 | Aug. 31, 2015 | May 31, 2015 | Feb. 28, 2015 | Nov. 30, 2014 | Aug. 31, 2014 | Nov. 30, 2015 | Nov. 30, 2014 | Feb. 29, 2016 | Feb. 28, 2015 | May 31, 2016 | May 31, 2015 | May 31, 2014
Summary of Quarterly Financial Information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 93,419 | $ 87,434 | $ 89,284 | $ 83,753 | $ 90,697 | $ 86,597 | $ 92,149 | $ 87,091 | $ 173,037 | $ 179,240 | $ 260,471 | $ 265,837 | $ 353,890 | $ 356,534 | $ 354,425
Earnings per common share |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (usd per share) | $ (1.19) | $ 0.02 | $ (0.01) | $ (0.02) | $ (0.02) | $ (0.12) | $ 0.03 | $ 0.01 |  |  |  |  | $ (1.21) | $ (0.09) | $ 0.07
Diluted (usd per share) | $ (1.19) | $ 0.02 | $ (0.01) | $ (0.02) | $ (0.02) | $ (0.12) | $ 0.03 | $ 0.01 |  |  |  |  | $ (1.21) | $ (0.09) | $ 0.07

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