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Marketable Securities - Available-for-sale Securities (Details) - USD ($)
$ in Thousands
Aug. 01, 2015
May. 02, 2015
Schedule of Available-for-sale Securities    
Amortized Cost $ 25,327 $ 25,349
Unrealized Gains 3 6
Unrealized Losses (1) (9)
Fair Value 25,329 25,346
Certificates of deposit    
Schedule of Available-for-sale Securities    
Amortized Cost 13,636 11,409
Unrealized Gains 0 0
Unrealized Losses 0 0
Fair Value 13,636 11,409
U.S. Government securities    
Schedule of Available-for-sale Securities    
Amortized Cost 500 1,000
Unrealized Gains 0 1
Unrealized Losses 0 0
Fair Value 500 1,001
U.S. Government sponsored entities    
Schedule of Available-for-sale Securities    
Amortized Cost 7,224 7,951
Unrealized Gains 0 0
Unrealized Losses (1) (9)
Fair Value 7,223 7,942
Municipal obligations    
Schedule of Available-for-sale Securities    
Amortized Cost 3,967 4,989
Unrealized Gains 3 5
Unrealized Losses 0 0
Fair Value $ 3,970 $ 4,994