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Marketable Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Apr. 29, 2017	Apr. 30, 2016
Schedule of Available-for-sale Securities
Amortized Cost	$ 32,721	$ 24,671
Unrealized Gains	14	2
Unrealized Losses	(22)	(1)
Fair Value	32,713	24,672
Certificates of deposit
Schedule of Available-for-sale Securities
Amortized Cost	12,487	14,927
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	12,487	14,927
U.S. Government securities
Schedule of Available-for-sale Securities
Amortized Cost	400
Unrealized Gains	0
Unrealized Losses	0
Fair Value	400
U.S. Government sponsored entities
Schedule of Available-for-sale Securities
Amortized Cost	12,260	8,523
Unrealized Gains	0	0
Unrealized Losses	(22)	(1)
Fair Value	12,238	8,522
Municipal obligations
Schedule of Available-for-sale Securities
Amortized Cost	7,574	1,221
Unrealized Gains	14	2
Unrealized Losses	0	0
Fair Value	$ 7,588	$ 1,223

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
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-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

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