Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021
Statement of Comprehensive Income [Abstract]
Net loss	$ (6,003)	$ (3,607)
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments	(186)	(23)
Change in unrecognized actuarial gain on pension obligations	21	6,044
Comprehensive income (loss), net of tax	(6,168)	2,414
Less comprehensive income attributable to the non-controlling interest	123	65
Total comprehensive income (loss) attributable to Kewaunee Scientific Corporation	$ (6,291)	$ 2,349