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General and Summary of Significant Accounting Policies - Narrative (Detail) | 12 Months Ended
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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 |

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