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General and Summary of Significant Accounting Policies - Narrative (Detail) | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2021 | Apr. 30, 2023 USD ($) Segment | May 01, 2022 USD ($) | May 02, 2021 USD ($) | Feb. 01, 2021 | Jan. 01, 2017
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Number of Operating Segments | Segment |  | 2 |  |  |  |
Non-cash inventory charges |  | $ 5,819,000 | $ 1,927,000 | $ 882,000 |  |
Rabbi trust investments |  | 8,500,000 | 9,400,000 |  |  |
Interest costs incurred on lines of credit |  | 0 | 17,000 | 51,000 |  |
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 |  | $ 37,978,000 | $ 35,415,000 | 37,756,000 |  |
Shipping and Handling [Member] |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Selling, general and administrative expenses |  | 4,200,000 | 4,300,000 | $ 3,900,000 |  |
Rabbi Trust Investments [Member] |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Unrealized gain (loss) on investments |  | $ 19,000 | $ 32,000 |  |  |
CIH [Member] |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  | 50.00%
CIH [Member] |  |  |  |  |  |
Organization And Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |
Acquisition of additional ownership percentage |  |  |  | 50.00% | 50.00% | 50.00%
Majority ownership percentage acquired |  |  |  |  | 100.00% |
Percentage of share earnings and losses | 50.00% |  |  |  |  |

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