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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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