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Nu Aire Acquisition - Pro Forma Information (Details) - Nu Aire - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jul. 31, 2025	Jul. 31, 2024
Business Acquisition [Line Items]
Net sales	$ 71,104	$ 65,448
Net earnings	$ 3,093	$ 4,273
Net earnings per share attributable to Kewaunee Scientific Corporation stockholders:
Basic (in USD per share)	$ 1.08	$ 1.50
Diluted (in USD per share)	$ 1.04	$ 1.44

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