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Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Income Statement [Abstract]
Net sales	$ 27,754us-gaap_SalesRevenueNet	$ 26,013us-gaap_SalesRevenueNet	$ 88,546us-gaap_SalesRevenueNet	$ 84,114us-gaap_SalesRevenueNet
Costs of products sold	23,298us-gaap_CostOfGoodsSold	21,302us-gaap_CostOfGoodsSold	72,120us-gaap_CostOfGoodsSold	67,934us-gaap_CostOfGoodsSold
Gross profit	4,456us-gaap_GrossProfit	4,711us-gaap_GrossProfit	16,426us-gaap_GrossProfit	16,180us-gaap_GrossProfit
Operating expenses	3,872us-gaap_OperatingExpenses	3,773us-gaap_OperatingExpenses	12,170us-gaap_OperatingExpenses	11,676us-gaap_OperatingExpenses
Operating earnings	584us-gaap_OperatingIncomeLoss	938us-gaap_OperatingIncomeLoss	4,256us-gaap_OperatingIncomeLoss	4,504us-gaap_OperatingIncomeLoss
Other income	134us-gaap_OtherIncome	95us-gaap_OtherIncome	385us-gaap_OtherIncome	265us-gaap_OtherIncome
Interest expense	(91)us-gaap_InterestExpense	(116)us-gaap_InterestExpense	(274)us-gaap_InterestExpense	(276)us-gaap_InterestExpense
Earnings before income taxes	627us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	917us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	4,367us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	4,493us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Income tax expense	109us-gaap_IncomeTaxExpenseBenefit	292us-gaap_IncomeTaxExpenseBenefit	1,361us-gaap_IncomeTaxExpenseBenefit	1,505us-gaap_IncomeTaxExpenseBenefit
Net earnings	518us-gaap_ProfitLoss	625us-gaap_ProfitLoss	3,006us-gaap_ProfitLoss	2,988us-gaap_ProfitLoss
Less: net earnings attributable to the noncontrolling interest	34us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	21us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	86us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	72us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net earnings attributable to Kewaunee Scientific Corporation	$ 484us-gaap_NetIncomeLoss	$ 604us-gaap_NetIncomeLoss	$ 2,920us-gaap_NetIncomeLoss	$ 2,916us-gaap_NetIncomeLoss
Net earnings per share attributable to Kewaunee Scientific Corporation stockholders
Basic	$ 0.18us-gaap_EarningsPerShareBasic	$ 0.23us-gaap_EarningsPerShareBasic	$ 1.11us-gaap_EarningsPerShareBasic	$ 1.12us-gaap_EarningsPerShareBasic
Diluted	$ 0.18us-gaap_EarningsPerShareDiluted	$ 0.22us-gaap_EarningsPerShareDiluted	$ 1.10us-gaap_EarningsPerShareDiluted	$ 1.11us-gaap_EarningsPerShareDiluted
Weighted average number of common shares outstanding
Basic	2,628us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	2,615us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	2,625us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	2,606us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted	2,659us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	2,645us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	2,656us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	2,627us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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

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