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Segment Information - (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2026
Apr. 30, 2025
Segment Reporting Information [Line Items]    
Net sales $ 281,999 $ 240,472
Intersegment revenues 0 0
Depreciation and amortization 6,281 4,759
Interest expense 3,862 3,214
Earnings (loss) before income taxes 13,733 14,785
Income tax expense 3,268 3,202
Net earnings attributable to non-controlling interest 847 178
Net earnings (loss) attributable to Kewaunee Scientific Corporation 9,618 11,405
Segment assets 178,311 194,654
Expenditures for segment assets 3,937 2,166
Non-US    
Segment Reporting Information [Line Items]    
Net sales 79,938 68,805
Corporate    
Segment Reporting Information [Line Items]    
Net sales 0 0
Intersegment revenues (5,148) (4,094)
Depreciation and amortization 86 173
Interest expense 2,575 1,651
Earnings (loss) before income taxes (11,174) (9,850)
Income tax expense (2,613) (2,983)
Net earnings attributable to non-controlling interest 0 0
Net earnings (loss) attributable to Kewaunee Scientific Corporation (8,561) (6,867)
Segment assets 0 0
Expenditures for segment assets 0 0
LPG | Operating Segments    
Segment Reporting Information [Line Items]    
Net sales 214,886 179,398
Depreciation and amortization 5,843 4,166
Interest expense 1,236 1,492
Earnings (loss) before income taxes 17,986 19,923
Income tax expense 3,830 4,553
Net earnings attributable to non-controlling interest 0 0
Net earnings (loss) attributable to Kewaunee Scientific Corporation 14,156 15,370
Segment assets 140,160 152,569
Expenditures for segment assets 3,726 1,954
LPG | Operating Segments | Non-US    
Segment Reporting Information [Line Items]    
Net sales 12,825 7,731
LPG | Intersegment revenues    
Segment Reporting Information [Line Items]    
Intersegment revenues 1,947 626
International | Operating Segments    
Segment Reporting Information [Line Items]    
Net sales 67,113 61,074
Depreciation and amortization 352 420
Interest expense 51 71
Earnings (loss) before income taxes 6,921 4,712
Income tax expense 2,051 1,632
Net earnings attributable to non-controlling interest 847 178
Net earnings (loss) attributable to Kewaunee Scientific Corporation 4,023 2,902
Segment assets 38,151 42,085
Expenditures for segment assets 211 212
International | Operating Segments | Non-US    
Segment Reporting Information [Line Items]    
Net sales 67,113 61,074
International | Intersegment revenues    
Segment Reporting Information [Line Items]    
Intersegment revenues $ 3,201 $ 3,468