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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								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
Inventory [Line Items]
Cost of products sold									$ 121,231	$ 125,891
Income tax expense									446	4,161
Net earnings	$ (1,197)	$ 15	$ 1,454	$ 1,416	$ 1,613	$ 888	$ 1,765	$ 1,192	1,688	5,458
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 (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
FIFO
Inventory [Line Items]
Cost of products sold									$ 121,231
Income tax expense									446
Net earnings									1,688
Net earnings attributable to Kewaunee Scientific Corporation									$ 1,529
Net earnings per share attributable to Kewaunee Scientific Corporation
Basic (in usd per share)									$ 0.56
Diluted (in usd per share)									$ 0.55
Adjustments
Inventory [Line Items]
Cost of products sold									$ 444
Income tax expense									(104)
Net earnings									(340)
Net earnings attributable to Kewaunee Scientific Corporation									$ (340)
Net earnings per share attributable to Kewaunee Scientific Corporation
Basic (in usd per share)									$ (0.12)
Diluted (in usd per share)									$ (0.12)
LIFO
Inventory [Line Items]
Cost of products sold									$ 121,675
Income tax expense									342
Net earnings									1,348
Net earnings attributable to Kewaunee Scientific Corporation									$ 1,189
Net earnings per share attributable to Kewaunee Scientific Corporation
Basic (in usd per share)									$ 0.44
Diluted (in usd per share)									$ 0.43

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