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v3.10.0.1

Quarterly Information (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2018 | Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | May 31, 2018 | May 31, 2017 | May 31, 2016
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 88,317 | $ 83,851 | $ 86,706 | $ 85,411 | $ 86,914 | $ 85,602 | $ 89,029 | $ 88,098 | $ 344,285 | $ 349,643 | $ 353,890
Gross profit | 47,467 | 45,448 | 42,731 | 41,229 | 42,335 | 43,792 | 45,010 | 45,032 | 176,875 | 176,169 | 174,316
Net income (loss) | $ 2,102 | $ 14,019 | $ 249 | $ (35) | $ (12,913) | $ 2,887 | $ 13,734 | $ 1,300 | $ 16,335 | $ 5,008 | $ (43,590)
Earnings (loss) per common share |  |  |  |  |  |  |  |  |  |  |
Basic (usd per share) | $ 0.06 | $ 0.38 | $ 0.01 | $ 0.00 | $ (0.35) | $ 0.08 | $ 0.37 | $ 0.04 | $ 0.44 | $ 0.14 | $ (1.21)
Diluted (usd per share) | $ 0.06 | $ 0.37 | $ 0.01 | $ 0.00 | $ (0.35) | $ 0.08 | $ 0.37 | $ 0.04 | $ 0.44 | $ 0.14 | $ (1.21)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Discrete tax benefit |  | $ 9,300 |  |  |  |  |  |  |  |  |
Estimated litigation liability |  |  |  |  | $ 12,500 |  |  |  |  | $ 12,500 |
Discontinued Operations, Disposed of by Means Other than Sale | Acculis Capital Systems |  |  |  |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Disposal group, impact to income |  |  |  |  | $ 4,500 |  |  |  |  |  |

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