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Fair Value - Narrative (Detail) - USD ($)
3 Months Ended
Aug. 01, 2021
May 02, 2021
Aug. 02, 2020
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Short-term investments - available for sale $ 9,700,000 $ 5,500,000 $ 983,000
Amortized cost of held-to-maturity investments 8,300,000 4,300,000 6,400,000
Fair value of held-to-maturity investments 8,300,000 4,300,000 6,500,000
Long-term investments (Rabbi Trust) - available for sale $ 8,841,000 8,415,000 [1] 7,916,000
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 on investments $ 143,000 24,000 6,000
Current Expected Credit Loses [Member]      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Accumulated unrealized gain on investments 143,000    
Allowance for credit losses related to short-term available for sale or held-to-maturity investments 0 0 0
Credit loss expense 0    
Long-term Investments (Rabbi Trust) [Member]      
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]      
Accumulated unrealized gain on investments $ 151,000 $ 122,000 $ 53,000
[1] Derived from audited financial statements.