Fair Value - Narrative (Detail) - USD ($)	Oct. 30, 2022	May 01, 2022		Oct. 31, 2021
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Short-term investments - available for sale				$ 9,700,000
Amortized cost of held-to-maturity investments				9,900,000
Fair value of held-to-maturity investments				9,900,000
Investments (Rabbi Trust) - available for sale	$ 9,800,000	$ 9,400,000		9,000,000.0
Long-term investments (Rabbi Trust) - available for sale	7,526,000	9,357,000	[1]	9,036,000
Long-term investments (Rabbi Trust) - available for sale	7,600,000	9,400,000		9,000,000.0
Short-term investments (Rabbi Trust) - available for sale	2,237,000
Short-term Investments [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Accumulated unrealized gain on investments				116,000
Investments (Rabbi Trust) [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Accumulated unrealized gain (loss) on investments	$ (21,000)	$ 32,000		$ 169,000

[1] Derived from audited financial statements.