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Quarterly Information Quarterly Information (unaudited) Statement of Immaterial Errors (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
Cost of sales	$ 46,650us-gaap_CostOfGoodsSold								$ 174,757us-gaap_CostOfGoodsSold	$ 173,402us-gaap_CostOfGoodsSold	$ 96,608us-gaap_CostOfGoodsSold	$ 90,047us-gaap_CostOfGoodsSold
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
Operating income	3,584us-gaap_OperatingIncomeLoss								12,940us-gaap_OperatingIncomeLoss	6,288us-gaap_OperatingIncomeLoss	(3,908)us-gaap_OperatingIncomeLoss	11,901us-gaap_OperatingIncomeLoss
Income before income tax provision	2,110us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments								5,740us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(1,587)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	(5,422)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	10,636us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense	3,325us-gaap_IncomeTaxExpenseBenefit								3,074us-gaap_IncomeTaxExpenseBenefit	(376)us-gaap_IncomeTaxExpenseBenefit	(239)us-gaap_IncomeTaxExpenseBenefit	2,559us-gaap_IncomeTaxExpenseBenefit
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
Income per common 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
Income per diluted 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
Inventory, net	61,234us-gaap_InventoryNet				55,079us-gaap_InventoryNet				61,234us-gaap_InventoryNet	55,079us-gaap_InventoryNet
Income taxes payable	689us-gaap_TaxesPayableCurrent				0us-gaap_TaxesPayableCurrent				689us-gaap_TaxesPayableCurrent	0us-gaap_TaxesPayableCurrent
Change in inventories									(5,608)us-gaap_IncreaseDecreaseInInventories	(1,909)us-gaap_IncreaseDecreaseInInventories	(1,522)us-gaap_IncreaseDecreaseInInventories
Accounts payable, accrued and other liabilities									6,658us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	(9,711)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	6,582us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Net cash provided by operating activities									24,681us-gaap_NetCashProvidedByUsedInOperatingActivities	26,652us-gaap_NetCashProvidedByUsedInOperatingActivities	11,602us-gaap_NetCashProvidedByUsedInOperatingActivities
As Previously Reported
Cost of sales	46,534us-gaap_CostOfGoodsSold / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember								174,594us-gaap_CostOfGoodsSold / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember	173,037us-gaap_CostOfGoodsSold / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember	95,829us-gaap_CostOfGoodsSold / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember	90,047us-gaap_CostOfGoodsSold / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Gross profit	47,531us-gaap_GrossProfit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember								179,861us-gaap_GrossProfit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember	168,989us-gaap_GrossProfit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember	125,958us-gaap_GrossProfit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember	125,703us-gaap_GrossProfit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Operating income	3,735us-gaap_OperatingIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember								13,448us-gaap_OperatingIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember	7,094us-gaap_OperatingIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember	(2,962)us-gaap_OperatingIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember	11,963us-gaap_OperatingIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Income before income tax provision	2,246us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember								6,380us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember	(643)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember	(5,282)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember	10,698us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Income tax expense	3,324us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember								3,292us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember	(31)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember	(188)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember	2,581us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Net income	(1,078)us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember								3,088us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember	(612)us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember	(5,094)us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember	8,117us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Inventory, net	61,056us-gaap_InventoryNet / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember				55,062us-gaap_InventoryNet / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember				61,056us-gaap_InventoryNet / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember	55,062us-gaap_InventoryNet / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Net cash provided by operating activities									25,280us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember	26,883us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember	11,497us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioPreviouslyReportedMember
Adjustments
Cost of sales	116us-gaap_CostOfGoodsSold / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember								163us-gaap_CostOfGoodsSold / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	365us-gaap_CostOfGoodsSold / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	779us-gaap_CostOfGoodsSold / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	0us-gaap_CostOfGoodsSold / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember
Gross profit	(121)us-gaap_GrossProfit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember								(193)us-gaap_GrossProfit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	(475)us-gaap_GrossProfit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	(649)us-gaap_GrossProfit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	(130)us-gaap_GrossProfit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember
Operating income	(151)us-gaap_OperatingIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember								(508)us-gaap_OperatingIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	(806)us-gaap_OperatingIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	(946)us-gaap_OperatingIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	(62)us-gaap_OperatingIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember
Income before income tax provision	(136)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember								(640)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	(944)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	(140)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	(62)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember
Income tax expense	1us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember								(218)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	(345)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	(51)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	(22)us-gaap_IncomeTaxExpenseBenefit / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember
Net income	(137)us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember								(422)us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	(599)us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	(89)us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	(40)us-gaap_NetIncomeLoss / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember
Inventory, net	178us-gaap_InventoryNet / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember				17us-gaap_InventoryNet / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember				178us-gaap_InventoryNet / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	17us-gaap_InventoryNet / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember
Net cash provided by operating activities									$ (599)us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	$ (231)us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember	$ 105us-gaap_NetCashProvidedByUsedInOperatingActivities / us-gaap_StatementScenarioAxis = us-gaap_ScenarioAdjustmentMember

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Total costs related to goods produced and sold during the reporting period.

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