General and Summary of Significant Accounting Policies - Narrative (Detail)	12 Months Ended
Apr. 28, 2024 USD ($) Segment	Apr. 30, 2023 USD ($)	May 01, 2022 USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]
Number of Operating Segments \| Segment	2
Non-cash inventory charges	$ (1,628,000)	$ 5,819,000	$ 1,927,000
Rabbi trust investments	8,000,000	8,500,000
Interest costs incurred on lines of credit	11,000	0	17,000
Interest cost capitalized	0	0	0
Asset impairment charges	$ 0	0	$ 0
Dividends received deduction percentage for earnings and profits received from foreign corporation	100.00%		100.00%
Dividends received deduction, foreign corporation ownership percentage	10.00%		10.00%
Selling, general and administrative expenses	$ 38,611,000	37,978,000	$ 35,415,000
Shipping and Handling [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Selling, general and administrative expenses	4,600,000	4,200,000	$ 4,300,000
Rabbi Trust Investments [Member]
Organization And Summary Of Significant Accounting Policies [Line Items]
Unrealized gain (loss) on investments	$ 118,000	$ 19,000

Asset impairment charges from continuing and discontinued operations.

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Available for sale debt and equity securities accumulated gross unrealized gain (loss) before tax.

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Available for sale securities debt and equity securities.

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The ownership percentage of a foreign corporation under the dividends received deduction.

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The deductible percentage of dividends received from a partially owned foreign corporation.

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Organization And Summary Of Significant Accounting Policies [Line Items]

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Amount of interest capitalized during the period.

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Total interest costs incurred during the period and either capitalized or charged against earnings.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 835
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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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-Topic 220
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