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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 | $ 94,060 us-gaap_SalesRevenueNet | $ 88,150 us-gaap_SalesRevenueNet | $ 88,571 us-gaap_SalesRevenueNet | $ 83,644 us-gaap_SalesRevenueNet | $ 89,932 us-gaap_SalesRevenueNet | $ 81,571 us-gaap_SalesRevenueNet | $ 87,007 us-gaap_SalesRevenueNet | $ 83,406 us-gaap_SalesRevenueNet | $ 354,425 us-gaap_SalesRevenueNet | $ 341,916 us-gaap_SalesRevenueNet | $ 221,917 us-gaap_SalesRevenueNet | $ 215,620 us-gaap_SalesRevenueNet
Gross profit | 47,410 us-gaap_GrossProfit | 44,793 us-gaap_GrossProfit | 44,885 us-gaap_GrossProfit | 42,580 us-gaap_GrossProfit | 43,982 us-gaap_GrossProfit | 41,129 us-gaap_GrossProfit | 44,016 us-gaap_GrossProfit | 39,387 us-gaap_GrossProfit | 179,668 us-gaap_GrossProfit | 168,514 us-gaap_GrossProfit | 125,309 us-gaap_GrossProfit | 125,573 us-gaap_GrossProfit
Net income | $ (1,215)us-gaap_NetIncomeLoss | $ 4,515 us-gaap_NetIncomeLoss | $ (261)us-gaap_NetIncomeLoss | $ (373)us-gaap_NetIncomeLoss | $ (1,021)us-gaap_NetIncomeLoss | $ (1,083)us-gaap_NetIncomeLoss | $ 1,878 us-gaap_NetIncomeLoss | $ (985)us-gaap_NetIncomeLoss | $ 2,666 us-gaap_NetIncomeLoss | $ (1,211)us-gaap_NetIncomeLoss | $ (5,183)us-gaap_NetIncomeLoss | $ 8,077 us-gaap_NetIncomeLoss
Earnings per common share |  |  |  |  |  |  |  |  |  |  |  |
Basic (usd per share) | $ (0.03)us-gaap_EarningsPerShareBasic | $ 0.13 us-gaap_EarningsPerShareBasic | $ (0.01)us-gaap_EarningsPerShareBasic | $ (0.01)us-gaap_EarningsPerShareBasic | $ (0.03)us-gaap_EarningsPerShareBasic | $ (0.03)us-gaap_EarningsPerShareBasic | $ 0.05 us-gaap_EarningsPerShareBasic | $ (0.03)us-gaap_EarningsPerShareBasic | $ 0.08 us-gaap_EarningsPerShareBasic | $ (0.03)us-gaap_EarningsPerShareBasic | $ (0.20)us-gaap_EarningsPerShareBasic |
Diluted (usd per share) | $ (0.03)us-gaap_EarningsPerShareDiluted | $ 0.13 us-gaap_EarningsPerShareDiluted | $ (0.01)us-gaap_EarningsPerShareDiluted | $ (0.01)us-gaap_EarningsPerShareDiluted | $ (0.03)us-gaap_EarningsPerShareDiluted | $ (0.03)us-gaap_EarningsPerShareDiluted | $ 0.05 us-gaap_EarningsPerShareDiluted | $ (0.03)us-gaap_EarningsPerShareDiluted | $ 0.08 us-gaap_EarningsPerShareDiluted | $ (0.03)us-gaap_EarningsPerShareDiluted | $ (0.20)us-gaap_EarningsPerShareDiluted |

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