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Marketable Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Aug. 03, 2019	Apr. 27, 2019
Schedule of Available-for-sale Securities
Amortized Cost	$ 11,880	$ 26,379
Unrealized Losses	(2)	(35)
Fair Value	11,878	26,344
Certificates of deposit
Schedule of Available-for-sale Securities
Amortized Cost	3,464	3,464
Unrealized Losses	0	0
Fair Value	3,464	3,464
U.S. Government securities
Schedule of Available-for-sale Securities
Amortized Cost	1,000	10,779
Unrealized Losses	0	(5)
Fair Value	1,000	10,774
U.S. Government sponsored entities
Schedule of Available-for-sale Securities
Amortized Cost	5,913	10,510
Unrealized Losses	(2)	(28)
Fair Value	5,911	10,482
Municipal bonds
Schedule of Available-for-sale Securities
Amortized Cost	1,503	1,626
Unrealized Losses	0	(2)
Fair Value	$ 1,503	$ 1,624

X

- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

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

+ References

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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