Condensed Consolidated Statements of Comprehensive Loss (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Statement of Comprehensive Income [Abstract]
Net (loss) earnings	$ (1,286)	$ 95	$ (5,675)	$ (678)
Other comprehensive (loss) income, net of tax:
Foreign currency translation adjustments	52	31	(107)	(17)
Other comprehensive (loss) income	52	31	(107)	(17)
Comprehensive (loss) income, net of tax	(1,234)	126	(5,782)	(695)
Less: Comprehensive income attributable to the non-controlling interest	33	14	89	19
Comprehensive (loss) income attributable to Kewaunee Scientific Corporation	$ (1,267)	$ 112	$ (5,871)	$ (714)