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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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