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Segment Information - Segment Information (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2016	Apr. 30, 2015	Apr. 30, 2014
Segment Reporting Information [Line Items]
Revenues									$ 128,626	$ 118,828	$ 111,166
Depreciation									2,592	2,615	2,549
Earnings (loss) before income taxes									5,739	5,385	5,986
Income tax expense (benefit)									1,862	1,745	1,983
Net earnings attributable to noncontrolling interest	$ 22	$ 18	$ 12	$ 23	$ 25	$ 34	$ 26	$ 26	75	111	108
Net earnings (loss) attributable to Kewaunee Scientific Corporation	1,337	$ 830	$ 695	$ 940	609	$ 484	$ 1,202	$ 1,234	3,802	3,529	3,895
Segment assets	72,405				69,490				72,405	69,490	62,717
Expenditures for segment assets									2,187	2,568	2,021
Non-US [Member]
Segment Reporting Information [Line Items]
Revenues									27,373	26,899	20,529
Corporate [Member]
Segment Reporting Information [Line Items]
Intersegment revenues									(6,921)	(3,852)	(5,833)
Earnings (loss) before income taxes									(4,470)	(3,498)	(4,003)
Income tax expense (benefit)									(1,076)	(1,141)	(1,354)
Net earnings (loss) attributable to Kewaunee Scientific Corporation									(3,394)	(2,357)	(2,649)
Domestic [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues									103,047	93,098	91,750
Intersegment revenues									3,612	1,433	3,378
Depreciation									2,375	2,399	2,432
Earnings (loss) before income taxes									7,471	5,810	7,386
Income tax expense (benefit)									1,834	1,794	2,482
Net earnings (loss) attributable to Kewaunee Scientific Corporation									5,637	4,016	4,904
Segment assets	54,030				52,723				54,030	52,723	47,890
Expenditures for segment assets									1,995	2,259	1,822
Domestic [Member] | Operating Segments [Member] | Non-US [Member]
Segment Reporting Information [Line Items]
Revenues									1,794	1,169	1,113
International [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues									25,579	25,730	19,416
Intersegment revenues									3,309	2,419	2,455
Depreciation									217	216	117
Earnings (loss) before income taxes									2,738	3,073	2,603
Income tax expense (benefit)									1,104	1,092	855
Net earnings attributable to noncontrolling interest									75	111	108
Net earnings (loss) attributable to Kewaunee Scientific Corporation									1,559	1,870	1,640
Segment assets	$ 18,375				$ 16,767				18,375	16,767	14,827
Expenditures for segment assets									192	309	199
International [Member] | Operating Segments [Member] | Non-US [Member]
Segment Reporting Information [Line Items]
Revenues									$ 25,579	$ 25,730	$ 19,416

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