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Nu Aire Acquisition - Pro Forma Information (Details) - Nu Aire - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jan. 31, 2026
Jan. 31, 2025
Jan. 31, 2026
Jan. 31, 2025
Business Acquisition [Line Items]        
Net sales $ 69,399 $ 67,167 $ 210,599 $ 199,548
Net earnings $ 692 $ 1,856 $ 6,230 $ 6,812
Net earnings per share attributable to Kewaunee Scientific Corporation stockholders:        
Basic (in USD per share) $ 0.24 $ 0.65 $ 2.18 $ 2.38
Diluted (in USD per share) $ 0.23 $ 0.62 $ 2.09 $ 2.29