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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
3 Months Ended 12 Months Ended
Dec. 22, 2021
Apr. 30, 2022
Jan. 31, 2022
Oct. 31, 2021
Jul. 31, 2021
Apr. 30, 2021
Jan. 31, 2021
Oct. 31, 2020
Jul. 31, 2020
Apr. 30, 2022
Apr. 30, 2021
Significant Accounting Policies [Line Items]                      
Net sales   $ 49,715,000 $ 40,633,000 $ 39,031,000 $ 39,493,000 $ 38,707,000 $ 33,339,000 $ 39,000,000 $ 36,423,000 $ 168,872,000 $ 147,469,000
Unbilled receivables   9,287,000       5,716,000       9,287,000 5,716,000
Property plant and equipment impairment charges                   0 0
Sale agreement for property $ 30,275,000                    
Portion of sale agreement payable in redeemable preferred stock                   14,864,000  
Carrying value of redeemable preferred shares   $ 13,457,000       0       $ 13,457,000 0
Acceptance period for sale agreement   30 days               30 days  
Term of agreement   20 years               20 years  
Retainage included in accounts receivable   $ 523,000       1,668,000       $ 523,000 1,668,000
Research and development costs                   990,000 1,406,000
Advertising costs                   $ 175,000 $ 174,000
Anti-dilutive options exclude from computation of earning per share                   44,750 166,880
Awards granted (in shares)                   0 0
Operating Segments | International                      
Significant Accounting Policies [Line Items]                      
Net sales                   $ 42,024,000 $ 36,434,000
Domestic                      
Significant Accounting Policies [Line Items]                      
Net sales                   126,848,000 111,035,000
Subsidiaries                      
Significant Accounting Policies [Line Items]                      
Net assets   13,127,000       11,126,000       $ 13,127,000 $ 11,126,000
Restricted Stock Units (RSUs)                      
Significant Accounting Policies [Line Items]                      
Restricted stock units granted (in shares)                   67,750 95,861
Customer Concentration Risk | Sales Revenue, Segment | Domestic                      
Significant Accounting Policies [Line Items]                      
Concentration risk percentage                   38.00% 40.00%
Customer Concentration Risk | Accounts Receivable | Domestic                      
Significant Accounting Policies [Line Items]                      
Concentration risk percentage                   21.00% 20.00%
Prepaid Expenses and Other Current Assets                      
Significant Accounting Policies [Line Items]                      
Unbilled retainage included in other assets   1,293,000       1,213,000       $ 1,293,000 $ 1,213,000
Other Noncurrent Assets                      
Significant Accounting Policies [Line Items]                      
Assets held in trust account for non-qualified benefit plans included in other assets   2,480,000       2,649,000       2,480,000 2,649,000
Cash surrender value of life insurance policies included in other assets   $ 110,000       $ 108,000       $ 110,000 $ 108,000
Kewaunee Scientific Corporation | Kewaunee Labway Asia Pte. Ltd.                      
Significant Accounting Policies [Line Items]                      
Percentage of controlling interest in subsidiaries   100.00%               100.00%  
Kewaunee Scientific Corporation | Kewaunee Scientific Corporation Singapore Pte. Ltd.                      
Significant Accounting Policies [Line Items]                      
Percentage of controlling interest in subsidiaries   100.00%               100.00%  
Kewaunee Scientific Corporation | Kewaunee Labway India Pvt. Ltd.                      
Significant Accounting Policies [Line Items]                      
Percentage of controlling interest in subsidiaries   95.00%               95.00%  
Kewaunee Scientific Corporation | Koncepo Scientech International                      
Significant Accounting Policies [Line Items]                      
Percentage of controlling interest in subsidiaries   80.00%               80.00%  
Kewaunee Scientific Corporation | Kewaunee Scientific Corporation China                      
Significant Accounting Policies [Line Items]                      
Percentage of controlling interest in subsidiaries   100.00%               100.00%  
Kewaunee Scientific Corporation Singapore Pte. Ltd. | Kequip Global Lab Solutions Pvt. Ltd.                      
Significant Accounting Policies [Line Items]                      
Percentage of controlling interest in subsidiaries   70.00%               70.00%