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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, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2016
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 44,508	$ 38,190	$ 41,471	$ 33,881	$ 34,579	$ 30,371	$ 36,329	$ 37,279	$ 158,050	$ 138,558	$ 128,626
Gross profit	8,934	8,354	7,911	6,821	7,332	5,032	7,104	7,139	32,020	26,607	23,708
Net earnings	1,490	918	1,765	1,192	1,395	358	1,537	1,330	5,365	4,620	3,877
Less: net earnings attributable to the noncontrolling interest	57	35	41	44	7	17	51	30	177	105	75
Net earnings attributable to Kewaunee Scientific Corporation	$ 1,433	$ 883	$ 1,724	$ 1,148	$ 1,388	$ 341	$ 1,486	$ 1,300	$ 5,188	$ 4,515	$ 3,802
Net earnings per share attributable to Kewaunee Scientific Corporation
Basic	$ 0.53	$ 0.32	$ 0.64	$ 0.42	$ 0.51	$ 0.13	$ 0.55	$ 0.48	$ 1.91	$ 1.67	$ 1.43
Diluted	0.52	0.31	0.62	0.42	0.51	0.13	0.54	0.48	1.87	1.66	1.42
Cash dividends paid per share	$ 0.17	$ 0.17	$ 0.17	$ 0.15	$ 0.15	$ 0.15	$ 0.15	$ 0.13	$ 0.66	$ 0.58	$ 0.51

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