Significant Accounting Policies [Line Items]

No definition available.

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- Definition

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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- Definition

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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- Definition

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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- Definition

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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- Definition

Amount of net assets (liabilities).

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- Definition

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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- Definition

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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- Definition

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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- Definition

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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- Definition

Fixed interest rate related to the interest rate derivative.

+ References

No definition available.

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- Definition

Date the entity entered into the derivative contract, in CCYY-MM-DD format.

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No definition available.

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Date the derivative contract matures, in CCYY-MM-DD format.

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No definition available.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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- Definition

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

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No definition available.

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- Definition

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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- Definition

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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- Definition

Net number of non-option equity instruments granted to participants.

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Gross number of share options (or share units) granted during the period.

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No definition available.

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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Apr. 30, 2021	Jan. 31, 2021	Oct. 31, 2020	Jul. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2021	Apr. 30, 2020
Significant Accounting Policies [Line Items]
Net sales	$ 38,707,000	$ 33,339,000	$ 39,000,000	$ 36,423,000	$ 34,257,000	$ 34,225,000	$ 39,722,000	$ 39,336,000	$ 147,469,000	$ 147,540,000
Unbilled receivables	6,929,000				6,131,000				6,929,000	6,131,000
Property plant and equipment impairment charges									0	0
Retainage included in accounts receivable	1,668,000				1,928,000				1,668,000	1,928,000
Research and development costs									1,406,000	1,816,000
Advertising costs									$ 174,000	$ 332,000
Anti-dilutive options exclude from computation of earning per share									166,880	121,311
Awards granted (in shares)									0	0
Domestic
Significant Accounting Policies [Line Items]
Net sales									$ 111,035,000	$ 115,103,000
Subsidiaries
Significant Accounting Policies [Line Items]
Net assets	11,126,000				12,422,000				11,126,000	12,422,000
Net sales									36,434,000	$ 32,437,000
August 1, 2017 to May 1, 2020
Significant Accounting Policies [Line Items]
Outstanding advances under the long-term debt	$ 2,600,000								$ 2,600,000
Interest rate swap, conversion rate	4.37%								4.37%
Interest rate swap, beginning date of conversion									Aug. 01, 2017
Interest rate swap, ending date of conversion									May 01, 2020
November 3, 2014 to May 1, 2020
Significant Accounting Policies [Line Items]
Outstanding advances under the long-term debt	$ 1,218,000								$ 1,218,000
Interest rate swap, conversion rate	3.07%								3.07%
Interest rate swap, beginning date of conversion									Nov. 03, 2014
Interest rate swap, ending date of conversion									May 01, 2020
Restricted Stock Units (RSUs)
Significant Accounting Policies [Line Items]
Restricted stock units granted (in shares)									95,861	39,781
Customer Concentration Risk \| Sales Revenue, Segment \| Domestic
Significant Accounting Policies [Line Items]
Concentration risk percentage									40.00%	37.00%
Customer Concentration Risk \| Accounts Receivable \| Domestic
Significant Accounting Policies [Line Items]
Concentration risk percentage									20.00%	27.00%
Other Noncurrent Assets
Significant Accounting Policies [Line Items]
Assets held in trust account for non-qualified benefit plans included in other assets	$ 2,649,000				2,485,000				$ 2,649,000	$ 2,485,000
Cash surrender value of life insurance policies included in other assets	$ 108,000				$ 87,000				$ 108,000	$ 87,000
Kewaunee Scientific Corporation \| Kewaunee Labway Asia Pte. Ltd.
Significant Accounting Policies [Line Items]
Percentage of controlling interest in subsidiaries	100.00%								100.00%
Kewaunee Scientific Corporation \| Kewaunee Labway India Pvt. Ltd.
Significant Accounting Policies [Line Items]
Percentage of controlling interest in subsidiaries	95.00%								95.00%
Kewaunee Scientific Corporation \| Kewaunee Scientific Corporation Singapore Pte. Ltd.
Significant Accounting Policies [Line Items]
Percentage of controlling interest in subsidiaries	100.00%								100.00%
Kewaunee Scientific Corporation \| Koncepo Scientech International
Significant Accounting Policies [Line Items]
Percentage of controlling interest in subsidiaries	80.00%								80.00%
Kewaunee Scientific Corporation \| Kewaunee Scientific Corporation China
Significant Accounting Policies [Line Items]
Percentage of controlling interest in subsidiaries	100.00%								100.00%
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%								70.00%