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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2017	Apr. 30, 2016	Apr. 30, 2015
Statement of Comprehensive Income [Abstract]
Net earnings	$ 4,620	$ 3,877	$ 3,640
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments	231	(217)	(346)
Change in unrecognized actuarial loss on pension obligations	1,012	448	(1,266)
Change in fair value of cash flow hedges	64	23	5
Comprehensive income, net of tax	5,927	4,131	2,033
Less comprehensive income attributable to the noncontrolling interest	105	75	111
Total comprehensive income attributable to Kewaunee Scientific Corporation	$ 5,822	$ 4,056	$ 1,922

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