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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 22, 2021 | Apr. 30, 2023 | Apr. 30, 2022
Significant Accounting Policies [Line Items] |  |  |
Net sales |  | $ 219,494,000 | $ 168,872,000
Unbilled receivables |  | 13,459,000 | 9,287,000
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 |  | $ 0 | 13,457,000
Term of agreement |  | 20 years |
Retainage included in accounts receivable |  | $ 235,000 | 523,000
Research and development costs |  | 1,012,000 | 990,000
Advertising costs |  | $ 226,000 | $ 175,000
Anti-dilutive options exclude from computation of earning per share |  | 33,900 | 44,750
Awards granted (in shares) |  | 0 | 0
Operating Segments | International |  |  |
Significant Accounting Policies [Line Items] |  |  |
Net sales |  | $ 72,778,000 | $ 42,024,000
Domestic |  |  |
Significant Accounting Policies [Line Items] |  |  |
Net sales |  | 146,716,000 | 126,848,000
Subsidiaries |  |  |
Significant Accounting Policies [Line Items] |  |  |
Net assets |  | $ 16,786,000 | $ 13,127,000
Restricted Stock Units (RSUs) |  |  |
Significant Accounting Policies [Line Items] |  |  |
Restricted stock units granted (in shares) |  | 87,969 | 67,750
Customer Concentration Risk | Sales Revenue, Segment | Domestic |  |  |
Significant Accounting Policies [Line Items] |  |  |
Concentration risk percentage |  | 36.00% | 38.00%
Customer Concentration Risk | Accounts Receivable | Domestic |  |  |
Significant Accounting Policies [Line Items] |  |  |
Concentration risk percentage |  | 23.00% | 21.00%
Prepaid Expenses and Other Current Assets |  |  |
Significant Accounting Policies [Line Items] |  |  |
Unbilled retainage included in other assets |  | $ 1,191,000 | $ 1,293,000
Other Noncurrent Assets |  |  |
Significant Accounting Policies [Line Items] |  |  |
Assets held in trust account for non-qualified benefit plans included in other assets |  | 2,352,000 | 2,480,000
Cash surrender value of life insurance policies included in other assets |  | $ 111,000 | $ 110,000
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 |  | 95.00% |
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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