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Marketable Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands | Feb. 01, 2020 | Apr. 27, 2019
--- | --- | ---
Schedule of Available-for-sale Securities |  |
Amortized Cost | $ 1,727 | $ 26,379
Unrealized Losses | 0 | (35)
Fair Value | 1,727 | 26,344
Certificates of deposit |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 1,727 | 3,464
Unrealized Losses | 0 | 0
Fair Value | $ 1,727 | 3,464
U.S. Government securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost |  | 10,779
Unrealized Losses |  | (5)
Fair Value |  | 10,774
U.S. Government sponsored entities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost |  | 10,510
Unrealized Losses |  | (28)
Fair Value |  | 10,482
Municipal bonds |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost |  | 1,626
Unrealized Losses |  | (2)
Fair Value |  | $ 1,624

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- 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 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
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