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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
Jul. 31, 2018
Jul. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Net Sales $ 42,152 $ 33,881
Costs of products sold 34,678 27,060
Gross profit 7,474 6,821
Operating expenses 5,763 5,133
Operating earnings 1,711 1,688
Other income 164 168
Interest expense (91) (59)
Earnings before income taxes 1,784 1,797
Income tax expense 368 605
Net earnings 1,416 1,192
Net earnings attributable to the noncontrolling interest 9 44
Net earnings attributable to Kewaunee Scientific Corporation $ 1,407 $ 1,148
Basic Earnings Per Share $ 0.51 $ 0.42
Diluted Earnings Per Share $ 0.50 $ 0.42
ASU 2014-09 [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Net Sales $ 42,152  
Costs of products sold 34,678  
Gross profit 7,474  
Operating expenses 5,763  
Operating earnings 1,711  
Other income 164  
Interest expense (91)  
Earnings before income taxes 1,784  
Income tax expense 368  
Net earnings 1,416  
Net earnings attributable to the noncontrolling interest 9  
Net earnings attributable to Kewaunee Scientific Corporation $ 1,407  
Basic Earnings Per Share $ 0.51  
Diluted Earnings Per Share $ 0.50  
ASU 2014-09 [Member] | Revenue Guidance Adjustments [Member]    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Net Sales $ (1,169)  
Costs of products sold (685)  
Gross profit (484)  
Operating expenses 2  
Operating earnings (486)  
Earnings before income taxes (486)  
Income tax expense (117)  
Net earnings (369)  
Net earnings attributable to Kewaunee Scientific Corporation $ (369)  
Basic Earnings Per Share $ (0.13)  
Diluted Earnings Per Share $ (0.13)  
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 $ 40,983  
Costs of products sold 33,993  
Gross profit 6,990  
Operating expenses 5,765  
Operating earnings 1,225  
Other income 164  
Interest expense (91)  
Earnings before income taxes 1,298  
Income tax expense 251  
Net earnings 1,047  
Net earnings attributable to the noncontrolling interest 9  
Net earnings attributable to Kewaunee Scientific Corporation $ 1,038  
Basic Earnings Per Share $ 0.38  
Diluted Earnings Per Share $ 0.37