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Marketable Securities - Available-for-sale Securities (Details) (USD $)
In Thousands, unless otherwise specified
Nov. 01, 2014
Apr. 26, 2014
Schedule of Available-for-sale Securities    
Amortized Cost $ 25,439 $ 25,392
Unrealized Gains 11 14
Unrealized Losses (9) (8)
Fair Value 25,441 25,398
Certificates of deposit
    
Schedule of Available-for-sale Securities    
Amortized Cost 10,417 7,734
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 10,417 7,734
U.S. Government securities
    
Schedule of Available-for-sale Securities    
Amortized Cost 1,500 2,000
Unrealized Gains 2 2
Unrealized Losses 0 0
Fair Value 1,502 2,002
U.S. Government sponsored entities
    
Schedule of Available-for-sale Securities    
Amortized Cost 7,149 8,349
Unrealized Gains 0 0
Unrealized Losses (9) (8)
Fair Value 7,140 8,341
Municipal obligations
    
Schedule of Available-for-sale Securities    
Amortized Cost 6,373 7,309
Unrealized Gains 9 12
Unrealized Losses 0 0
Fair Value $ 6,382 $ 7,321