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Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Income Statement [Abstract]
Net sales	$ 138,558	$ 128,626	$ 118,828
Costs of products sold	111,951	104,918	97,062
Gross profit	26,607	23,708	21,766
Operating expenses	20,065	18,010	16,540
Operating earnings	6,542	5,698	5,226
Other income, net	496	347	484
Interest expense	(292)	(306)	(325)
Earnings before income taxes	6,746	5,739	5,385
Income tax expense	2,126	1,862	1,745
Net earnings	4,620	3,877	3,640
Less: net earnings attributable to the noncontrolling interest	105	75	111
Net earnings attributable to Kewaunee Scientific Corporation	$ 4,515	$ 3,802	$ 3,529
Net earnings per share attributable to Kewaunee Scientific Corporation stockholders
Basic	$ 1.67	$ 1.43	$ 1.34
Diluted	$ 1.66	$ 1.42	$ 1.33
Weighted average number of common shares outstanding
Basic	2,705	2,667	2,626
Diluted	2,726	2,687	2,658

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