Nu Aire Acquisition - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
Apr. 30, 2026	Apr. 30, 2025
Net earnings per share attributable to Kewaunee Scientific Corporation stockholders:
Basic (in usd per share)	$ 3.36	$ 3.98
Diluted (in usd per share)	$ 3.22	$ 3.83
Nu Aire
(actual)
Net sales	$ 281,999
Net earnings	$ 9,618
Net earnings per share attributable to Kewaunee Scientific Corporation stockholders:
Basic (in usd per share)	$ 3.36
Diluted (in usd per share)	$ 3.22
(pro forma)
Net sales		$ 276,696
Net earnings		$ 11,661
Net earnings per share attributable to Kewaunee Scientific Corporation stockholders:
Basic (in USD per share)		$ 4.07
Diluted (in USD per share)		$ 3.91

Per basic share amount, after tax, of pro forma income (loss) of combined entity as if acquisition date of business combination occurred as of beginning of period.

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