Percentage of accounts receivable balance of major customers.

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Number Of Major Customers

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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 billed to customers under long-term contracts or programs that have been withheld because of retainage provisions in a contract.

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Fixed interest rate related to the interest rate derivative.

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

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

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Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. For classified balance sheets, represents the current amount receivable, that is amounts expected to be collected within one year or the normal operating cycle, if longer.

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

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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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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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

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Summary of Significant Accounting Policies - Additional Information (Detail)	3 Months Ended								12 Months Ended
	Apr. 30, 2018 USD ($)	Jan. 31, 2018 USD ($)	Oct. 31, 2017 USD ($)	Jul. 31, 2017 USD ($)	Apr. 30, 2017 USD ($)	Jan. 31, 2017 USD ($)	Oct. 31, 2016 USD ($)	Jul. 31, 2016 USD ($)	Apr. 30, 2018 USD ($) Store shares	Apr. 30, 2017 USD ($) shares	Apr. 30, 2016 USD ($) shares	May 01, 2018 USD ($)	Dec. 12, 2017 USD ($)	Jun. 24, 2013	May 31, 2013 USD ($)
Significant Accounting Policies [Line Items]
Net sales	$ 44,508,000	$ 38,190,000	$ 41,471,000	$ 33,881,000	$ 34,579,000	$ 30,371,000	$ 36,329,000	$ 37,279,000	$ 158,050,000	$ 138,558,000	$ 128,626,000
Unbilled receivables	1,007,000				450,000				1,007,000	450,000
Property plant and equipment impairment charges									0	0	0
Retainage included in accounts receivable	2,724,000				2,839,000				$ 2,724,000	$ 2,839,000
Total accounts receivable									31.00%	25.00%
Research and development costs									$ 1,537,000	$ 1,163,000	1,167,000
Advertising costs									$ 395,000	$ 352,000	$ 311,000
Anti-dilutive options exclude from computation of earning per share \| shares									0	39,200	110,100
Stock options granted \| shares										45,200	40,200
Retained earnings	43,165,000				39,771,000				$ 43,165,000	$ 39,771,000
Subsidiaries [Member]
Significant Accounting Policies [Line Items]
Net assets	$ 15,762,000				12,268,000				15,762,000	12,268,000
Net sales									$ 43,456,000	$ 25,477,000	$ 25,579,000
May 1, 2013 to August 1, 2017 [Member]
Significant Accounting Policies [Line Items]
Outstanding advances under the long-term debt															$ 3,450,000
Interest rate swap, conversion rate	4.875%								4.875%
Interest rate swap, beginning date of conversion									May 01, 2013
Interest rate swap, ending date of conversion									Aug. 01, 2017
August 1, 2017 to May 1, 2020 [Member]
Significant Accounting Policies [Line Items]
Outstanding advances under the long-term debt															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 [Member]
Significant Accounting Policies [Line Items]
Outstanding advances under the long-term debt															$ 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
Accounts Receivable [Member]
Significant Accounting Policies [Line Items]
Number of domestic customers \| Store									2
Restricted Stock Units (RSUs) [Member]
Significant Accounting Policies [Line Items]
restricted stock units issued \| shares										23,907
Customer Concentration Risk [Member] \| Sales Revenue, Segment [Member]
Significant Accounting Policies [Line Items]
Total sales percentage									33.00%	38.00%	40.00%
Number of domestic customers \| Store									3
Subsequent Event [Member] \| ASU 2014-09 [Member] \| Revenue Guidance Adjustments [Member] \| Maximum [Member]
Significant Accounting Policies [Line Items]
Retained earnings												$ 500,000
Other Noncurrent Assets [Member]
Significant Accounting Policies [Line Items]
Assets held in trust account for non-qualified benefit plans included in other assets	$ 4,050,000				3,748,000				$ 4,050,000	$ 3,748,000
Cash surrender value of life insurance policies included in other assets	$ 65,000				$ 75,000				$ 65,000	$ 75,000
Other Current Assets [Member]
Significant Accounting Policies [Line Items]
Claim against insurance carrier for expenses													$ 255,000
Kewaunee Labway Asia Pte. Ltd. [Member]
Significant Accounting Policies [Line Items]
Percentage of controlling interest in subsidiaries	100.00%								100.00%					49.00%
Kewaunee Labway India Pvt. Ltd. [Member]
Significant Accounting Policies [Line Items]
Percentage of controlling interest in subsidiaries	90.00%								90.00%
Kewaunee Scientific Corporation India Pvt. Ltd. [Member]
Significant Accounting Policies [Line Items]
Percentage of controlling interest in subsidiaries	100.00%								100.00%
Kewaunee Scientific Corporation Singapore Pte. Ltd. [Member]
Significant Accounting Policies [Line Items]
Percentage of controlling interest in subsidiaries	100.00%								100.00%
Koncepo Scientech International [Member]
Significant Accounting Policies [Line Items]
Percentage of controlling interest in subsidiaries	100.00%								100.00%
Kewaunee Scientific Corporation China [Member]
Significant Accounting Policies [Line Items]
Percentage of controlling interest in subsidiaries	100.00%								100.00%