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Significant Accounting Policies [Line Items]

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

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Amount of net assets (liabilities).

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Carrying amount as of the balance sheet date of amounts which could be received based on the terms of the insurance contract upon surrendering life policies owned by the entity.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Amount of right to consideration in exchange for good or service transferred to customer withheld under retainage provision in long-term contract or program when right to consideration is unconditional.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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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%