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Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ 95	$ (1,901)	$ (678)	$ (3,566)
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	31	(26)	(17)	(9)
Change in fair value of cash flow hedge	0	0	0	1
Other comprehensive income (loss)	31	(26)	(17)	(8)
Comprehensive income (loss), net of tax	126	(1,927)	(695)	(3,574)
Less: Comprehensive income attributable to the noncontrolling interest	14	17	19	59
Comprehensive income (loss) attributable to Kewaunee Scientific Corporation	$ 112	$ (1,944)	$ (714)	$ (3,633)

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