Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2022	Jan. 31, 2021
Income Statement [Abstract]
Net sales	$ 40,633	$ 33,339	$ 119,157	$ 108,762
Cost of products sold	35,011	27,685	104,264	90,832
Gross profit	5,622	5,654	14,893	17,930
Operating expenses	6,490	6,030	19,742	18,593
Operating loss	(868)	(376)	(4,849)	(663)
Pension income (expense)	88	(288)	266	(865)
Other income, net	51	51	149	171
Interest expense	(158)	(105)	(396)	(310)
Loss before income taxes	(887)	(718)	(4,830)	(1,667)
Income tax expense (benefit)	399	(813)	845	(989)
Net (loss) earnings	(1,286)	95	(5,675)	(678)
Less: Net earnings attributable to the non-controlling interest	33	14	89	19
Net (loss) earnings attributable to Kewaunee Scientific Corporation	$ (1,319)	$ 81	$ (5,764)	$ (697)
Net (loss) earnings per share attributable to Kewaunee Scientific Corporation stockholders
Basic (in dollars per share)	$ (0.47)	$ 0.03	$ (2.07)	$ (0.25)
Diluted (in dollars per share)	$ (0.47)	$ 0.03	$ (2.07)	$ (0.25)
Weighted average number of common shares outstanding
Basic (in shares)	2,790	2,762	2,785	2,759
Diluted (in shares)	2,790	2,789	2,785	2,759