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Summary of Significant Accounting Policies - Additional Information (Detail)		12 Months Ended
	Dec. 22, 2021 USD ($)	Apr. 30, 2025 USD ($) segment shares	Apr. 30, 2024 USD ($) shares
Significant Accounting Policies [Line Items]
Net sales		$ 240,472,000	$ 203,755,000
Unbilled receivables		12,693,000	11,840,000
Property plant and equipment impairment charges		0	0
Goodwill and intangible asset impairment		$ 0
Sale agreement for property	$ 30,275,000
Term of agreement		20 years
Research and development costs		$ 919,000	920,000
Advertising costs		$ 912,000	$ 336,000
Anti-dilutive options exclude from computation of earning per share | shares		0	0
Awards granted (in shares) | shares		0	0
Number of business segment | segment		2
Domestic
Significant Accounting Policies [Line Items]
Net sales		$ 179,398,000	$ 137,238,000
Subsidiaries
Significant Accounting Policies [Line Items]
Net assets		18,061,000	18,547,000
Net sales		$ 98,920,000	$ 66,517,000
Restricted Stock Units (RSUs)
Significant Accounting Policies [Line Items]
Granted (in shares) | shares		62,326	117,747
Restricted stock units granted (in shares) | shares			117,747
Customer Concentration Risk | Sales Revenue, Segment | Domestic
Significant Accounting Policies [Line Items]
Concentration risk percentage		41.00%	42.00%
Customer Concentration Risk | Accounts Receivable | Domestic
Significant Accounting Policies [Line Items]
Concentration risk percentage		26.00%	21.00%
Prepaid Expenses and Other Current Assets
Significant Accounting Policies [Line Items]
Unbilled retainage included in other assets		$ 0	$ 312,000
Other Noncurrent Assets
Significant Accounting Policies [Line Items]
Assets held in trust account for non-qualified benefit plans included in other assets		$ 3,263,000	$ 2,611,000
Kewaunee Scientific Corporation | Nu Aire, Inc
Significant Accounting Policies [Line Items]
Percentage of controlling interest in subsidiaries		100.00%
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		92.00%
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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