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Marketable Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Jan. 26, 2019	Apr. 28, 2018
Schedule of Available-for-sale Securities
Amortized Cost	$ 37,678	$ 34,676
Unrealized Losses	(82)	(154)
Fair Value	37,596	34,522
Certificates of deposit
Schedule of Available-for-sale Securities
Amortized Cost	3,959	8,669
Unrealized Losses	0	0
Fair Value	3,959	8,669
U.S. Government securities
Schedule of Available-for-sale Securities
Amortized Cost	15,493	999
Unrealized Losses	(11)	(7)
Fair Value	15,482	992
U.S. Government sponsored entities
Schedule of Available-for-sale Securities
Amortized Cost	14,929	20,072
Unrealized Losses	(65)	(123)
Fair Value	14,864	19,949
Municipal bonds
Schedule of Available-for-sale Securities
Amortized Cost	3,297	4,936
Unrealized Losses	(6)	(24)
Fair Value	$ 3,291	$ 4,912

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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=82897076&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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