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Summary of Significant Accounting Policies - Additional Information (Detail) |  | 12 Months Ended
--- | --- | ---
Dec. 22, 2021 USD ($) | Apr. 30, 2026 USD ($) segment shares | Apr. 30, 2025 USD ($) shares
Significant Accounting Policies [Line Items] |  |  |
Unbilled receivables |  | $ 14,163,000 | $ 12,693,000
Property plant and equipment impairment charges |  | 0 | 0
Goodwill and intangible asset impairment |  | $ 0 | 0
Sale agreement for property | $ 30,275,000 |  |
Term of agreement |  | 20 years |
Research and development costs |  | $ 898,000 | 919,000
Advertising costs |  | $ 1,502,000 | $ 912,000
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 |
Restricted Stock Units (RSUs) |  |  |
Significant Accounting Policies [Line Items] |  |  |
Granted (in shares) | shares |  | 72,728 | 62,326
Restricted stock units granted (in shares) | shares |  |  | 62,326
Customer Concentration Risk | Sales Revenue, Segment | LPG |  |  |
Significant Accounting Policies [Line Items] |  |  |
Concentration risk percentage |  | 34.00% | 41.00%
Customer Concentration Risk | Accounts Receivable | LPG |  |  |
Significant Accounting Policies [Line Items] |  |  |
Concentration risk percentage |  | 19.00% | 26.00%
Other Noncurrent Assets |  |  |
Significant Accounting Policies [Line Items] |  |  |
Assets held in trust account for non-qualified benefit plans included in other assets |  | $ 4,307,000 | $ 3,263,000
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 |  | 88.00% |
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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