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Quarterly Information (unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	May 31, 2014	Feb. 28, 2014	Nov. 30, 2013	Aug. 31, 2013	May 31, 2013	Feb. 28, 2013	Nov. 30, 2012	Aug. 31, 2012	May 31, 2014	May 31, 2013	May 31, 2012	May 31, 2011
Summary of Quarterly Financial Information
Net sales	$ 94,060us-gaap_SalesRevenueNet	$ 88,150us-gaap_SalesRevenueNet	$ 88,571us-gaap_SalesRevenueNet	$ 83,644us-gaap_SalesRevenueNet	$ 89,932us-gaap_SalesRevenueNet	$ 81,571us-gaap_SalesRevenueNet	$ 87,007us-gaap_SalesRevenueNet	$ 83,406us-gaap_SalesRevenueNet	$ 354,425us-gaap_SalesRevenueNet	$ 341,916us-gaap_SalesRevenueNet	$ 221,917us-gaap_SalesRevenueNet	$ 215,620us-gaap_SalesRevenueNet
Gross profit	47,410us-gaap_GrossProfit	44,793us-gaap_GrossProfit	44,885us-gaap_GrossProfit	42,580us-gaap_GrossProfit	43,982us-gaap_GrossProfit	41,129us-gaap_GrossProfit	44,016us-gaap_GrossProfit	39,387us-gaap_GrossProfit	179,668us-gaap_GrossProfit	168,514us-gaap_GrossProfit	125,309us-gaap_GrossProfit	125,573us-gaap_GrossProfit
Net income	$ (1,215)us-gaap_NetIncomeLoss	$ 4,515us-gaap_NetIncomeLoss	$ (261)us-gaap_NetIncomeLoss	$ (373)us-gaap_NetIncomeLoss	$ (1,021)us-gaap_NetIncomeLoss	$ (1,083)us-gaap_NetIncomeLoss	$ 1,878us-gaap_NetIncomeLoss	$ (985)us-gaap_NetIncomeLoss	$ 2,666us-gaap_NetIncomeLoss	$ (1,211)us-gaap_NetIncomeLoss	$ (5,183)us-gaap_NetIncomeLoss	$ 8,077us-gaap_NetIncomeLoss
Earnings per common share
Basic (usd per share)	$ (0.03)us-gaap_EarningsPerShareBasic	$ 0.13us-gaap_EarningsPerShareBasic	$ (0.01)us-gaap_EarningsPerShareBasic	$ (0.01)us-gaap_EarningsPerShareBasic	$ (0.03)us-gaap_EarningsPerShareBasic	$ (0.03)us-gaap_EarningsPerShareBasic	$ 0.05us-gaap_EarningsPerShareBasic	$ (0.03)us-gaap_EarningsPerShareBasic	$ 0.08us-gaap_EarningsPerShareBasic	$ (0.03)us-gaap_EarningsPerShareBasic	$ (0.20)us-gaap_EarningsPerShareBasic
Diluted (usd per share)	$ (0.03)us-gaap_EarningsPerShareDiluted	$ 0.13us-gaap_EarningsPerShareDiluted	$ (0.01)us-gaap_EarningsPerShareDiluted	$ (0.01)us-gaap_EarningsPerShareDiluted	$ (0.03)us-gaap_EarningsPerShareDiluted	$ (0.03)us-gaap_EarningsPerShareDiluted	$ 0.05us-gaap_EarningsPerShareDiluted	$ (0.03)us-gaap_EarningsPerShareDiluted	$ 0.08us-gaap_EarningsPerShareDiluted	$ (0.03)us-gaap_EarningsPerShareDiluted	$ (0.20)us-gaap_EarningsPerShareDiluted

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