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Fair Value - Narrative (Detail) - USD ($)	6 Months Ended
	Oct. 31, 2021	Nov. 01, 2020	May 02, 2021
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Short-term investments - available for sale	$ 9,709,000	$ 5,462,000	$ 5,542,000	[1]
Amortized cost of held-to-maturity investments	9,900,000	5,800,000	4,300,000
Fair value of held-to-maturity investments	9,900,000	5,800,000	4,300,000
Long-term investments (Rabbi Trust) - available for sale	$ 9,036,000	8,060,000	8,415,000	[1]
Maximum [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Investment remaining maturity period	4 years
Short-term Investments [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Accumulated unrealized gain (loss) on investments	$ 116,000	(29,000)	24,000
Current Expected Credit Loses [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Accumulated unrealized gain (loss) on investments	116,000
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	$ 169,000	$ 55,000	$ 122,000
[1] Derived from audited financial statements.

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