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Fair Value - Narrative (Detail) - USD ($) | 9 Months Ended |
--- | --- | ---
Jan. 30, 2022 | Jan. 31, 2021 | May 02, 2021
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Short-term investments - available for sale | $ 438,000 | $ 5,548,000 | $ 5,542,000 | [1]
Investment remaining maturity period | 2 years 3 months 18 days |  |  |
Amortized cost of held-to-maturity investments | $ 10,000,000.0 | 10,300,000 | 4,300,000 |
Fair value of held-to-maturity investments | 9,800,000 | 10,300,000 | 4,300,000 |
Long-term investments (Rabbi Trust) - available for sale | 9,223,000 | 8,232,000 | 8,415,000 | [1]
Short-term Investments [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Accumulated unrealized gain (loss) on investments | (2,000) | 30,000 | 24,000 |
Current Expected Credit Loses [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Accumulated unrealized gain (loss) on investments | (2,000) |  |  |
Allowance for credit losses related to short-term available for sale or held-to-maturity investments | 0 | 0 | 0 |
Credit loss expense | 0 | 0 |  |
Long-term Investments (Rabbi Trust) [Member] |  |  |  |
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items] |  |  |  |
Accumulated unrealized gain (loss) on investments | $ 90,000 | $ 87,000 | $ 122,000 |
[1] | Derived from audited financial statements.

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