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Consolidated Quarterly Data (Unaudited) - Schedule of Quarterly Financial Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2019	Apr. 30, 2018
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 34,748	$ 32,372	$ 37,278	$ 42,152	$ 44,508	$ 38,190	$ 41,471	$ 33,881	$ 146,550	$ 158,050
Gross profit	4,842	5,230	7,773	7,474	9,118	8,309	7,911	6,821	25,319	32,159
Net earnings	(1,197)	15	1,454	1,416	1,613	888	1,765	1,192	1,688	5,458
Less: net earnings attributable to the noncontrolling interest	73	37	40	9	57	35	41	44	159	177
Net earnings attributable to Kewaunee Scientific Corporation	$ (1,270)	$ (22)	$ 1,414	$ 1,407	$ 1,556	$ 853	$ 1,724	$ 1,148	$ 1,529	$ 5,281
Net earnings per share attributable to Kewaunee Scientific Corporation
Basic Loss Per Share (in usd per share)	$ (0.46)	$ (0.01)	$ 0.52	$ 0.51	$ 0.58	$ 0.31	$ 0.64	$ 0.42	$ 0.56	$ 1.94
Diluted (in usd per share)	(0.46)	(0.01)	0.51	0.50	0.56	0.30	0.62	0.42	0.55	1.90
Cash dividends paid (in usd per share)	$ 0.19	$ 0.19	$ 0.19	$ 0.17	$ 0.17	$ 0.17	$ 0.17	$ 0.15	$ 0.74	$ 0.66

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