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Marketable Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Oct. 31, 2015	May. 02, 2015
Schedule of Available-for-sale Securities
Amortized Cost	$ 24,938	$ 25,349
Unrealized Gains	1	6
Unrealized Losses	(4)	(9)
Fair Value	24,935	25,346
Certificates of deposit
Schedule of Available-for-sale Securities
Amortized Cost	14,925	11,409
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	14,925	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	6,577	7,951
Unrealized Gains	0	0
Unrealized Losses	(4)	(9)
Fair Value	6,573	7,942
Municipal obligations
Schedule of Available-for-sale Securities
Amortized Cost	2,936	4,989
Unrealized Gains	1	5
Unrealized Losses	0	0
Fair Value	$ 2,937	$ 4,994

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