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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% |

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