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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ (608)	$ 496
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(13)	196
Change in fair value of cash flow hedge	0	(1)
Other comprehensive income (loss)	(13)	195
Comprehensive income (loss), net of tax	(621)	691
Less: comprehensive income (loss) attributable to the noncontrolling interest	(10)	25
Comprehensive income (loss) attributable to Kewaunee Scientific Corporation	$ (611)	$ 666

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