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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 22, 2021 | Apr. 30, 2024 | Apr. 30, 2023
Significant Accounting Policies [Line Items] |  |  |
Net sales |  | $ 203,755,000 | $ 219,494,000
Unbilled receivables |  | 11,840,000 | 13,459,000
Property plant and equipment impairment charges |  | $ 0 | 0
Sale agreement for property | $ 30,275,000 |  |
Term of agreement |  | 20 years |
Retainage included in accounts receivable |  | $ 294,000 | 235,000
Research and development costs |  | 920,000 | 1,012,000
Advertising costs |  | $ 336,000 | $ 226,000
Anti-dilutive options exclude from computation of earning per share |  | 0 | 33,900
Awards granted (in shares) |  | 0 | 0
Operating Segments | International |  |  |
Significant Accounting Policies [Line Items] |  |  |
Net sales |  | $ 66,517,000 | $ 72,778,000
Domestic |  |  |
Significant Accounting Policies [Line Items] |  |  |
Net sales |  | 137,238,000 | 146,716,000
Subsidiaries |  |  |
Significant Accounting Policies [Line Items] |  |  |
Net assets |  | $ 18,547,000 | $ 16,786,000
Restricted Stock Units (RSUs) |  |  |
Significant Accounting Policies [Line Items] |  |  |
Restricted stock units granted (in shares) |  | 117,747 | 87,969
Customer Concentration Risk | Sales Revenue, Segment | Domestic |  |  |
Significant Accounting Policies [Line Items] |  |  |
Concentration risk percentage |  | 45.00% | 36.00%
Customer Concentration Risk | Accounts Receivable | Domestic |  |  |
Significant Accounting Policies [Line Items] |  |  |
Concentration risk percentage |  | 21.00% | 23.00%
Prepaid Expenses and Other Current Assets |  |  |
Significant Accounting Policies [Line Items] |  |  |
Unbilled retainage included in other assets |  | $ 312,000 | $ 1,191,000
Other Noncurrent Assets |  |  |
Significant Accounting Policies [Line Items] |  |  |
Assets held in trust account for non-qualified benefit plans included in other assets |  | 2,611,000 | 2,352,000
Cash surrender value of life insurance policies included in other assets |  | $ 31,000 | $ 111,000
Kewaunee Scientific Corporation | Kewaunee Labway Asia Pte. Ltd. |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of controlling interest in subsidiaries |  | 100.00% |
Kewaunee Scientific Corporation | Kewaunee Scientific Corporation Singapore Pte. Ltd. |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of controlling interest in subsidiaries |  | 100.00% |
Kewaunee Scientific Corporation | Kewaunee Labway India Pvt. Ltd. |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of controlling interest in subsidiaries |  | 94.00% |
Kewaunee Scientific Corporation | Koncepo Scientech International |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of controlling interest in subsidiaries |  | 80.00% |
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% |

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