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Marketable Securities - Available-for-sale Securities (Details) (USD $)
In Thousands, unless otherwise specified
Oct. 26, 2013
Apr. 27, 2013
Schedule of Available-for-sale Securities    
Amortized Cost $ 25,358 $ 24,024
Unrealized Gains 9 28
Unrealized Losses 0 0
Fair Value 25,367 24,052
Certificates of deposit
    
Schedule of Available-for-sale Securities    
Amortized Cost 5,667 4,677
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 5,667 4,677
U.S. Government securities
    
Schedule of Available-for-sale Securities    
Amortized Cost 5,000 4,999
Unrealized Gains 5 19
Unrealized Losses 0 0
Fair Value 5,005 5,018
U.S. Government sponsored entities
    
Schedule of Available-for-sale Securities    
Amortized Cost 5,051 4,752
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 5,051 4,752
Municipal obligations
    
Schedule of Available-for-sale Securities    
Amortized Cost 9,640 9,596
Unrealized Gains 4 9
Unrealized Losses 0 0
Fair Value $ 9,644 $ 9,605