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Marketable Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands	May. 02, 2015	Apr. 26, 2014
Schedule of Available-for-sale Securities
Amortized Cost	$ 25,349	$ 25,392
Unrealized Gains	6	14
Unrealized Losses	(9)	(8)
Fair Value	25,346	25,398
Certificates of deposit
Schedule of Available-for-sale Securities
Amortized Cost	11,409	7,734
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	11,409	7,734
U.S. Government securities
Schedule of Available-for-sale Securities
Amortized Cost	1,000	2,000
Unrealized Gains	1	2
Unrealized Losses	0	0
Fair Value	1,001	2,002
U.S. Government sponsored entities
Schedule of Available-for-sale Securities
Amortized Cost	7,951	8,349
Unrealized Gains	0	0
Unrealized Losses	(9)	(8)
Fair Value	7,942	8,341
Municipal obligations
Schedule of Available-for-sale Securities
Amortized Cost	4,989	7,309
Unrealized Gains	5	12
Unrealized Losses	0	0
Fair Value	$ 4,994	$ 7,321

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