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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 6 Months Ended
Oct. 31, 2018
Jul. 31, 2018
Oct. 31, 2017
Jul. 31, 2017
Oct. 31, 2018
Oct. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net sales $ 37,278   $ 41,471   $ 79,430 $ 75,352
Costs of products sold 29,505   33,560   64,183 60,620
Gross profit 7,773   7,911   15,247 14,732
Operating expenses 5,963   5,256   11,726 10,389
Operating earnings 1,810   2,655   3,521 4,343
Other income 150   177   314 345
Interest expense (91)   (89)   (182) (148)
Earnings before income taxes 1,869   2,743   3,653 4,540
Income tax expense 415   978   783 1,583
Net earnings 1,454   1,765   2,870 2,957
Net earnings attributable to the noncontrolling interest 40   41   49 85
Net earnings attributable to Kewaunee Scientific Corporation $ 1,414 $ 1,407 $ 1,724 $ 1,148 $ 2,821 $ 2,872
Basic Earnings Per Share $ 0.52   $ 0.64   $ 1.03 $ 1.06
Diluted Earnings Per Share $ 0.51   $ 0.62   $ 1.01 $ 1.04
ASU 2014-09 [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net sales $ 37,278       $ 79,430  
Costs of products sold 29,505       64,183  
Gross profit 7,773       15,247  
Operating expenses 5,963       11,726  
Operating earnings 1,810       3,521  
Other income 150       314  
Interest expense (91)       (182)  
Earnings before income taxes 1,869       3,653  
Income tax expense 415       783  
Net earnings 1,454       2,870  
Net earnings attributable to the noncontrolling interest 40       49  
Net earnings attributable to Kewaunee Scientific Corporation $ 1,414       $ 2,821  
Basic Earnings Per Share $ 0.52       $ 1.03  
Diluted Earnings Per Share $ 0.51       $ 1.01  
ASU 2014-09 [Member] | Revenue Guidance Adjustments [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net sales $ 1,117       $ (52)  
Costs of products sold 1,035       350  
Gross profit 82       (402)  
Operating expenses 3       5  
Operating earnings 79       (407)  
Earnings before income taxes 79       (407)  
Income tax expense 25       (92)  
Net earnings 54       (315)  
Net earnings attributable to Kewaunee Scientific Corporation $ 54       $ (315)  
Basic Earnings Per Share $ 0.02       $ (0.11)  
Diluted Earnings Per Share $ 0.02       $ (0.11)  
ASU 2014-09 [Member] | Calculated under Revenue Guidance in Effect before Topic 606 [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net sales $ 38,395       $ 79,378  
Costs of products sold 30,540       64,533  
Gross profit 7,855       14,845  
Operating expenses 5,966       11,731  
Operating earnings 1,889       3,114  
Other income 150       314  
Interest expense (91)       (182)  
Earnings before income taxes 1,948       3,246  
Income tax expense 440       691  
Net earnings 1,508       2,555  
Net earnings attributable to the noncontrolling interest 40       49  
Net earnings attributable to Kewaunee Scientific Corporation $ 1,468       $ 2,506  
Basic Earnings Per Share $ 0.54       $ 0.92  
Diluted Earnings Per Share $ 0.53       $ 0.90