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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 15	$ 948	$ 2,885	$ 3,905
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	496	203	(617)	49
Change in fair value of cash flow hedge	(1)	12	4	30
Other comprehensive income (loss)	495	215	(613)	79
Comprehensive income, net of tax	510	1,163	2,272	3,984
Less: comprehensive income attributable to the noncontrolling interest	37	35	86	120
Comprehensive income attributable to Kewaunee Scientific Corporation	$ 473	$ 1,128	$ 2,186	$ 3,864

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