Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	Accumulated Other Comprehensive Loss
Beginning balance at Apr. 30, 2021	$ 41,241	$ 6,915	$ 3,807	$ (53)	$ 34,149	$ (3,577)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to Kewaunee Scientific Corporation	(1,345)				(1,345)
Other comprehensive loss	(76)					(76)
Stock-based compensation	238	67	171
Ending balance at Jul. 31, 2021	40,058	6,982	3,978	(53)	32,804	(3,653)
Beginning balance at Apr. 30, 2022	35,694	6,983	4,483	(53)	28,023	(3,742)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss attributable to Kewaunee Scientific Corporation	(747)				(747)
Other comprehensive loss	(224)					(224)
Stock-based compensation	(37)	97	(134)
Ending balance at Jul. 31, 2022	$ 34,686	$ 7,080	$ 4,349	$ (53)	$ 27,276	$ (3,966)