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Inventories - Schedule of Impact on the Company's Condensed Consolidated Statements of Operations (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended				6 Months Ended
	Oct. 31, 2018	Jul. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Inventory [Line Items]
Cost of products sold	$ 29,505		$ 33,560		$ 64,183	$ 60,620
Income tax expense (benefit)	415		978		783	1,583
Net earnings	1,454		1,765		2,870	2,957
Net earnings attributable to Kewaunee Scientific Corporation	$ 1,414	$ 1,407	$ 1,724	$ 1,148	$ 2,821	$ 2,872
Net earnings per share attributable to Kewaunee Scientific Corporation shareholders
Basic	$ 0.52		$ 0.64		$ 1.03	$ 1.06
Diluted	$ 0.51		$ 0.62		$ 1.01	$ 1.04
Fifo [Member]
Inventory [Line Items]
Cost of products sold	$ 29,505				$ 64,183
Income tax expense (benefit)	415				783
Net earnings	1,454				2,870
Net earnings attributable to Kewaunee Scientific Corporation	$ 1,414				$ 2,821
Net earnings per share attributable to Kewaunee Scientific Corporation shareholders
Basic	$ 0.52				$ 1.03
Diluted	$ 0.51				$ 1.01
Adjustments [Member]
Inventory [Line Items]
Cost of products sold	$ 100				$ 200
Income tax expense (benefit)	(24)				(49)
Net earnings	(76)				(151)
Net earnings attributable to Kewaunee Scientific Corporation	$ (76)				$ (151)
Net earnings per share attributable to Kewaunee Scientific Corporation shareholders
Basic	$ (0.03)				$ (0.05)
Diluted	$ (0.03)				$ (0.05)
Lifo [Member]
Inventory [Line Items]
Cost of products sold	$ 29,605				$ 64,383
Income tax expense (benefit)	391				734
Net earnings	1,378				2,719
Net earnings attributable to Kewaunee Scientific Corporation	$ 1,338				$ 2,670
Net earnings per share attributable to Kewaunee Scientific Corporation shareholders
Basic	$ 0.49				$ 0.98
Diluted	$ 0.48				$ 0.96

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