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Marketable Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Apr. 30, 2016	May 02, 2015
Schedule of Available-for-sale Securities
Amortized Cost	$ 24,671	$ 25,349
Unrealized Gains	2	6
Unrealized Losses	(1)	(9)
Fair Value	24,672	25,346
Certificates of deposit
Schedule of Available-for-sale Securities
Amortized Cost	14,927	11,409
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	14,927	11,409
U.S. Government securities
Schedule of Available-for-sale Securities
Amortized Cost		1,000
Unrealized Gains		1
Unrealized Losses		0
Fair Value		1,001
U.S. Government sponsored entities
Schedule of Available-for-sale Securities
Amortized Cost	8,523	7,951
Unrealized Gains	0	0
Unrealized Losses	(1)	(9)
Fair Value	8,522	7,942
Municipal obligations
Schedule of Available-for-sale Securities
Amortized Cost	1,221	4,989
Unrealized Gains	2	5
Unrealized Losses	0	0
Fair Value	$ 1,223	$ 4,994

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
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