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Consolidated Quarterly Data (Unaudited) - Schedule of Quarterly Financial Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Apr. 30, 2022
Jan. 31, 2022
Oct. 31, 2021
Jul. 31, 2021
Apr. 30, 2021
Jan. 31, 2021
Oct. 31, 2020
Jul. 31, 2020
Apr. 30, 2022
Apr. 30, 2021
Quarterly Financial Information Disclosure [Abstract]                    
Net sales $ 49,715 $ 40,633 $ 39,031 $ 39,493 $ 38,707 $ 33,339 $ 39,000 $ 36,423 $ 168,872 $ 147,469
Gross profit 9,327 5,622 3,597 5,674 6,063 5,654 6,395 5,881 24,220 23,993
Net loss (328) (1,286) (3,082) (1,307) (2,929) 95 (165) (608) (6,003) (3,607)
Less: net earnings attributable to the non-controlling interest 34 33 18 38 46 14 15 (10) 123 65
Net loss attributable to Kewaunee Scientific Corporation $ (362) $ (1,319) $ (3,100) $ (1,345) $ (2,975) $ 81 $ (180) $ (598) $ (6,126) $ (3,672)
Net loss per share attributable to Kewaunee Scientific Corporation                    
Basic (in usd per share) $ (0.13) $ (0.47) $ (1.11) $ (0.48) $ (1.08) $ 0.03 $ (0.07) $ (0.22) $ (2.20) $ (1.33)
Diluted (in usd per share) $ (0.13) $ (0.47) $ (1.11) $ (0.48) $ (1.08) $ 0.03 $ (0.07) $ (0.22) $ (2.20) $ (1.33)