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Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (1,307)	$ (608)
Other comprehensive loss, net of tax:
Foreign currency translation adjustments	(76)	(13)
Other comprehensive loss	(76)	(13)
Comprehensive loss, net of tax	(1,383)	(621)
Less: Comprehensive income (loss) attributable to the non-controlling interest	38	(10)
Comprehensive loss attributable to Kewaunee Scientific Corporation	$ (1,421)	$ (611)

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