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Revenue Recognition - Summary of Impact of Adopting ASC 606 on Condensed Consolidated Statements of Operations (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Apr. 30, 2019
Jan. 31, 2019
Oct. 31, 2018
Jul. 31, 2018
Apr. 30, 2018
Jan. 31, 2018
Oct. 31, 2017
Jul. 31, 2017
Apr. 30, 2019
Apr. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Net sales $ 34,748 $ 32,372 $ 37,278 $ 42,152 $ 44,508 $ 38,190 $ 41,471 $ 33,881 $ 146,550 $ 158,050
Cost of products sold                 121,231 125,891
Gross profit 4,842 5,230 7,773 7,474 9,118 8,309 7,911 6,821 25,319 32,159
Operating expenses                 23,207 22,240
Operating earnings                 2,112 9,919
Other income (expenses), net                 389 (1)
Interest expense                 (367) (299)
Earnings before income taxes                 2,134 9,619
Income tax expense                 446 4,161
Net earnings (1,197) 15 1,454 1,416 1,613 888 1,765 1,192 1,688 5,458
Net earnings attributable to noncontrolling interest 73 37 40 9 57 35 41 44 159 177
Net earnings attributable to Kewaunee Scientific Corporation $ (1,270) $ (22) $ 1,414 $ 1,407 $ 1,556 $ 853 $ 1,724 $ 1,148 $ 1,529 $ 5,281
Basic Loss Per Share (in usd per share) $ (0.46) $ (0.01) $ 0.52 $ 0.51 $ 0.58 $ 0.31 $ 0.64 $ 0.42 $ 0.56 $ 1.94
Diluted Loss Per Share (in dollars per share) $ (0.46) $ (0.01) $ 0.51 $ 0.50 $ 0.56 $ 0.30 $ 0.62 $ 0.42 $ 0.55 $ 1.90
Balance Without Adoption of ASC 606                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Net sales                 $ 145,324  
Cost of products sold                 121  
Gross profit                 24  
Operating expenses                 23  
Operating earnings                 1  
Other income (expenses), net                 0  
Interest expense                 0  
Earnings before income taxes                 1  
Income tax expense                 0  
Net earnings                 1  
Net earnings attributable to noncontrolling interest                 0  
Net earnings attributable to Kewaunee Scientific Corporation                 $ 923  
Basic Loss Per Share (in usd per share)                 $ 0.34  
Diluted Loss Per Share (in dollars per share)                 $ 0.33  
ASU 2014-09 | Adjustments                    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                    
Net sales                 $ (1,226)  
Cost of products sold                 0  
Gross profit                 (1)  
Operating expenses                 0  
Operating earnings                 (1)  
Other income (expenses), net                 0  
Interest expense                 0  
Earnings before income taxes                 (1)  
Income tax expense                 0  
Net earnings                 (1)  
Net earnings attributable to noncontrolling interest                 0  
Net earnings attributable to Kewaunee Scientific Corporation                 $ (606)  
Basic Loss Per Share (in usd per share)                 $ (0.22)  
Diluted Loss Per Share (in dollars per share)                 $ (0.22)