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Marketable Securities - Available-for-sale Securities (Details) (USD $)
In Thousands, unless otherwise specified
Jan. 25, 2014
Apr. 27, 2013
Schedule of Available-for-sale Securities    
Amortized Cost $ 25,274 $ 24,024
Unrealized Gains 16 28
Unrealized Losses 0 0
Fair Value 25,290 24,052
Certificates of deposit
    
Schedule of Available-for-sale Securities    
Amortized Cost 7,632 4,677
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 7,632 4,677
U.S. Government securities
    
Schedule of Available-for-sale Securities    
Amortized Cost 3,001 4,999
Unrealized Gains 0 19
Unrealized Losses 0 0
Fair Value 3,001 5,018
U.S. Government sponsored entities
    
Schedule of Available-for-sale Securities    
Amortized Cost 4,750 4,752
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 4,750 4,752
Municipal obligations
    
Schedule of Available-for-sale Securities    
Amortized Cost 9,891 9,596
Unrealized Gains 16 9
Unrealized Losses 0 0
Fair Value $ 9,907 $ 9,605