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Fair Value - Narrative (Detail) - USD ($) | Jul. 31, 2022 | May 01, 2022 | Aug. 01, 2021
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Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Short-term investments - available for sale | $ 0 | $ 0 |  | $ 9,700,000
Amortized cost of held-to-maturity investments |  |  |  | 8,300,000
Fair value of held-to-maturity investments |  |  |  | 8,300,000
Long-term investments (Rabbi Trust) - available for sale | 9,567,000 | 9,357,000 | [1] | 8,841,000
Short-term Investments [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Accumulated unrealized gain on investments |  |  |  | 143,000
Long-term Investments (Rabbi Trust) [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Accumulated unrealized gain on investments | $ 25,000 | $ 32,000 |  | $ 151,000
[1] | Derived from audited financial statements.

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