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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Statement of Comprehensive Income [Abstract]
Net earnings	$ 1,192	$ 1,330
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	75	(26)
Change in fair value of cash flow hedges	8	4
Other comprehensive income (loss)	83	(22)
Comprehensive income, net of tax	1,275	1,308
Less: comprehensive income attributable to the noncontrolling interest	44	30
Comprehensive income attributable to Kewaunee Scientific Corporation	$ 1,231	$ 1,278

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