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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
	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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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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