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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 9 Months Ended
Jan. 31, 2019
Oct. 31, 2018
Jul. 31, 2018
Jan. 31, 2018
Oct. 31, 2017
Jul. 31, 2017
Jan. 31, 2019
Jan. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Net sales $ 32,372     $ 38,190     $ 111,802 $ 113,542
Costs of products sold 27,142     29,791     91,325 90,411
Gross profit 5,230     8,399     20,477 23,131
Operating expenses 5,305     5,971     17,031 16,360
Operating earnings (loss) (75)     2,428     3,446 6,771
Other income 186     179     500 524
Interest expense (76)     (78)     (258) (226)
Earnings before income taxes 35     2,529     3,688 7,069
Income tax expense (benefit) 20     1,581     803 3,164
Net earnings 15     948     2,885 3,905
Net earnings attributable to the noncontrolling interest 37     35     86 120
Net earnings (loss) attributable to Kewaunee Scientific Corporation $ (22) $ 1,414 $ 1,407 $ 913 $ 1,724 $ 1,148 $ 2,799 $ 3,785
Basic Loss Per Share (in dollars per share) $ (0.01)     $ 0.33     $ 1.02 $ 1.39
Diluted Loss Per Share (in dollars per share) $ (0.01)     $ 0.32     $ 1.00 $ 1.36
Balance Without Adoption of ASC 606                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Net sales $ 30,704           $ 110,082  
Costs of products sold 25,623           90,156  
Gross profit 5,081           19,926  
Operating expenses 5,311           17,042  
Operating earnings (loss) (230)           2,884  
Other income 186           500  
Interest expense (76)           (258)  
Earnings before income taxes (120)           3,126  
Income tax expense (benefit) (26)           665  
Net earnings (94)           2,461  
Net earnings attributable to the noncontrolling interest 37           86  
Net earnings (loss) attributable to Kewaunee Scientific Corporation $ (131)           $ 2,375  
Basic Loss Per Share (in dollars per share) $ (0.05)           $ 0.87  
Diluted Loss Per Share (in dollars per share) $ (0.05)           $ 0.85  
ASU 2014-09 | Adjustments                
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                
Net sales $ (1,668)           $ (1,720)  
Costs of products sold (1,519)           (1,169)  
Gross profit (149)           (551)  
Operating expenses 6           11  
Operating earnings (loss) (155)           (562)  
Other income 0           0  
Interest expense 0           0  
Earnings before income taxes (155)           (562)  
Income tax expense (benefit) (46)           (138)  
Net earnings (109)           (424)  
Net earnings attributable to the noncontrolling interest 0           0  
Net earnings (loss) attributable to Kewaunee Scientific Corporation $ (109)           $ (424)  
Basic Loss Per Share (in dollars per share) $ (0.04)           $ (0.15)  
Diluted Loss Per Share (in dollars per share) $ (0.04)           $ (0.15)