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Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Statement of Comprehensive Income [Abstract]
Net earnings	$ 1,416	$ 1,192
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(388)	75
Change in fair value of cash flow hedges	4	8
Other comprehensive income (loss)	(384)	83
Comprehensive income, net of tax	1,032	1,275
Less: comprehensive income attributable to the noncontrolling interest	9	44
Comprehensive income attributable to Kewaunee Scientific Corporation	$ 1,023	$ 1,231

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