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Fair Value - Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Jan. 26, 2025
Apr. 28, 2024
Jan. 28, 2024
U.S. Government Money Market Fund [Member]      
Assets:      
Investments at fair value $ 6,606 $ 6,910 $ 6,995
Growth Allocation Mutual Funds [Member]      
Assets:      
Investments at fair value 835 691 656
S&P 500 Index Fund [Member]      
Assets:      
Investments at fair value 275 176 156
Other [Member]      
Assets:      
Investments at fair value 287 228 213
Quoted prices in active markets for identical assets - Level 1 [Member] | U.S. Government Money Market Fund [Member]      
Assets:      
Investments at fair value 6,606 6,910 6,995
Quoted prices in active markets for identical assets - Level 1 [Member] | Growth Allocation Mutual Funds [Member]      
Assets:      
Investments at fair value 835 691 656
Quoted prices in active markets for identical assets - Level 1 [Member] | S&P 500 Index Fund [Member]      
Assets:      
Investments at fair value 275 176 156
Quoted prices in active markets for identical assets - Level 1 [Member] | Other [Member]      
Assets:      
Investments at fair value $ 287 $ 228 $ 213