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v3.25.2

Summary of Significant Accounting Policies - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Dec. 22, 2021 USD ($) | Apr. 30, 2025 USD ($) segment shares | Apr. 30, 2024 USD ($) shares
Significant Accounting Policies [Line Items] |  |  |
Net sales |  | $ 240,472,000 | $ 203,755,000
Unbilled receivables |  | 12,693,000 | 11,840,000
Property plant and equipment impairment charges |  | 0 | 0
Goodwill and intangible asset impairment |  | $ 0 |
Sale agreement for property | $ 30,275,000 |  |
Term of agreement |  | 20 years |
Research and development costs |  | $ 919,000 | 920,000
Advertising costs |  | $ 912,000 | $ 336,000
Anti-dilutive options exclude from computation of earning per share | shares |  | 0 | 0
Awards granted (in shares) | shares |  | 0 | 0
Number of business segment | segment |  | 2 |
Domestic |  |  |
Significant Accounting Policies [Line Items] |  |  |
Net sales |  | $ 179,398,000 | $ 137,238,000
Subsidiaries |  |  |
Significant Accounting Policies [Line Items] |  |  |
Net assets |  | 18,061,000 | 18,547,000
Net sales |  | $ 98,920,000 | $ 66,517,000
Restricted Stock Units (RSUs) |  |  |
Significant Accounting Policies [Line Items] |  |  |
Granted (in shares) | shares |  | 62,326 | 117,747
Restricted stock units granted (in shares) | shares |  |  | 117,747
Customer Concentration Risk | Sales Revenue, Segment | Domestic |  |  |
Significant Accounting Policies [Line Items] |  |  |
Concentration risk percentage |  | 41.00% | 42.00%
Customer Concentration Risk | Accounts Receivable | Domestic |  |  |
Significant Accounting Policies [Line Items] |  |  |
Concentration risk percentage |  | 26.00% | 21.00%
Prepaid Expenses and Other Current Assets |  |  |
Significant Accounting Policies [Line Items] |  |  |
Unbilled retainage included in other assets |  | $ 0 | $ 312,000
Other Noncurrent Assets |  |  |
Significant Accounting Policies [Line Items] |  |  |
Assets held in trust account for non-qualified benefit plans included in other assets |  | $ 3,263,000 | $ 2,611,000
Kewaunee Scientific Corporation | Nu Aire, Inc |  |  |
Significant Accounting Policies [Line Items] |  |  |
Percentage of controlling interest in subsidiaries |  | 100.00% |
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 |  | 92.00% |
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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