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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
 3 Months Ended 12 Months Ended
May 01, 2018
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
Significant Accounting Policies [Line Items]                      
Net sales   $ 34,748,000 $ 32,372,000 $ 37,278,000 $ 42,152,000 $ 44,508,000 $ 38,190,000 $ 41,471,000 $ 33,881,000 $ 146,550,000 $ 158,050,000
Unbilled receivables   4,589,000       1,007,000       4,589,000 1,007,000
Property plant and equipment impairment charges                   0 0
Retainage included in accounts receivable   1,810,000       2,724,000       $ 1,810,000 $ 2,724,000
Total accounts receivable                   30.00% 31.00%
Research and development costs                   $ 1,550,000 $ 1,537,000
Advertising costs                   $ 268,000 $ 395,000
Anti-dilutive options exclude from computation of earning per share                   31,015 0
Stock options granted                   0 0
Retained earnings   43,552,000       43,836,000       $ 43,552,000 $ 43,836,000
Non-service components of net benefit cost                   295,000 694,000
Subsidiaries                      
Significant Accounting Policies [Line Items]                      
Net assets   17,887,000       15,762,000       17,887,000 15,762,000
Net sales                   29,964,000 $ 43,456,000
May 1, 2013 to August 1, 2017                      
Significant Accounting Policies [Line Items]                      
Outstanding advances under the long-term debt   $ 3,450,000               $ 3,450,000  
Interest rate swap, conversion rate   4.875%               4.875%  
Interest rate swap, beginning date of conversion                   May 01, 2013  
Interest rate swap, ending date of conversion                   Aug. 01, 2017  
August 1, 2017 to May 1, 2020                      
Significant Accounting Policies [Line Items]                      
Outstanding advances under the long-term debt   $ 2,600,000               $ 2,600,000  
Interest rate swap, conversion rate   4.37%               4.37%  
Interest rate swap, beginning date of conversion                   Aug. 01, 2017  
Interest rate swap, ending date of conversion                   May 01, 2020  
November 3, 2014 to May 1, 2020                      
Significant Accounting Policies [Line Items]                      
Outstanding advances under the long-term debt   $ 1,218,000               $ 1,218,000  
Interest rate swap, conversion rate   3.07%               3.07%  
Interest rate swap, beginning date of conversion                   Nov. 03, 2014  
Interest rate swap, ending date of conversion                   May 01, 2020  
Restricted Stock Units (RSUs)                      
Significant Accounting Policies [Line Items]                      
Restricted stock units granted (in shares)                   19,738 23,907
Customer Concentration Risk | Sales Revenue, Segment                      
Significant Accounting Policies [Line Items]                      
Total sales percentage                   34.00% 33.00%
Accounting Standards Update 2017-07                      
Significant Accounting Policies [Line Items]                      
Non-service components of net benefit cost                   $ 295,000  
ASU 2014-09 | Revenue Guidance Adjustments                      
Significant Accounting Policies [Line Items]                      
Net sales                   (1,226,000)  
Other Noncurrent Assets                      
Significant Accounting Policies [Line Items]                      
Assets held in trust account for non-qualified benefit plans included in other assets   $ 3,057,000       4,050,000       3,057,000 $ 4,050,000
Cash surrender value of life insurance policies included in other assets   $ 76,000       $ 65,000       $ 76,000 $ 65,000
Kewaunee Labway Asia Pte. Ltd.                      
Significant Accounting Policies [Line Items]                      
Percentage of controlling interest in subsidiaries   100.00%               100.00%  
Kewaunee Labway India Pvt. Ltd.                      
Significant Accounting Policies [Line Items]                      
Percentage of controlling interest in subsidiaries   95.00%               95.00%  
Kewaunee Scientific Corporation Singapore Pte. Ltd.                      
Significant Accounting Policies [Line Items]                      
Percentage of controlling interest in subsidiaries   100.00%               100.00%  
Koncepo Scientech International                      
Significant Accounting Policies [Line Items]                      
Percentage of controlling interest in subsidiaries   80.00%               80.00%  
Kewaunee Scientific Corporation China                      
Significant Accounting Policies [Line Items]                      
Percentage of controlling interest in subsidiaries   100.00%               100.00%  
Restatement Adjustment                      
Significant Accounting Policies [Line Items]                      
Retained earnings   $ (1,011,000)               $ (1,011,000)  
Restatement Adjustment | Accounting Standards Update 2017-07                      
Significant Accounting Policies [Line Items]                      
Non-service components of net benefit cost $ (694,000)                    
Other (income)/expense, net $ 694,000                 $ 295,000