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Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
Income Statement [Abstract]
Net sales	$ 38,190	$ 30,371	$ 113,542	$ 103,979
Costs of products sold	29,836	25,339	90,456	84,704
Gross profit	8,354	5,032	23,086	19,275
Operating expenses	5,971	4,590	16,360	14,484
Operating earnings	2,383	442	6,726	4,791
Other income	179	120	524	358
Interest expense	(78)	(71)	(226)	(229)
Earnings before income taxes	2,484	491	7,024	4,920
Income tax expense	1,566	133	3,149	1,695
Net earnings	918	358	3,875	3,225
Less: net earnings attributable to the noncontrolling interest	35	17	120	98
Net earnings attributable to Kewaunee Scientific Corporation	$ 883	$ 341	$ 3,755	$ 3,127
Net earnings per share attributable to Kewaunee Scientific Corporation stockholders
Basic	$ 0.32	$ 0.13	$ 1.38	$ 1.16
Diluted	$ 0.31	$ 0.13	$ 1.35	$ 1.15
Weighted average number of common shares outstanding
Basic	2,722	2,711	2,717	2,703
Diluted	2,784	2,734	2,772	2,724

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