Consolidated Statement of Stockholders' Equity - 9 months ended Jan. 31, 2018 - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Apr. 30, 2017	$ 42,883	$ 6,789	$ 2,695	$ (53)	$ 39,771	$ (6,319)
Net earnings attributable to Kewaunee Scientific Corporation	3,755				3,755
Other comprehensive income	79					79
Cash dividends paid, $0.49 per share	(1,331)				(1,331)
Stock options exercised, 22,600 shares	8	28	(20)
Stock based compensation	276	4	272
Balance at Jan. 31, 2018	$ 45,670	$ 6,821	$ 2,947	$ (53)	$ 42,195	$ (6,240)