Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Jul. 31, 2022	Jul. 31, 2021
Statement of Comprehensive Income [Abstract]
Net loss	$ (719)	$ (1,307)
Other comprehensive loss, net of tax:
Foreign currency translation adjustments	(224)	(76)
Other comprehensive loss	(224)	(76)
Comprehensive loss, net of tax	(943)	(1,383)
Less: Comprehensive income attributable to the non-controlling interest	28	38
Comprehensive loss attributable to Kewaunee Scientific Corporation	$ (971)	$ (1,421)