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Marketable Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands | Apr. 27, 2019 | Apr. 28, 2018
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Schedule of Available-for-sale Securities |  |
Amortized Cost | $ 26,379 | $ 34,676
Unrealized Losses | (35) | (154)
Fair Value | 26,344 | 34,522
Certificates of deposit |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 3,464 | 8,669
Unrealized Losses | 0 | 0
Fair Value | 3,464 | 8,669
U.S. Government securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 10,779 | 999
Unrealized Losses | (5) | (7)
Fair Value | 10,774 | 992
U.S. Government sponsored entities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 10,510 | 20,072
Unrealized Losses | (28) | (123)
Fair Value | 10,482 | 19,949
Municipal bonds |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 1,626 | 4,936
Unrealized Losses | (2) | (24)
Fair Value | $ 1,624 | $ 4,912

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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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