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Marketable Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands | Jan. 27, 2018 | Apr. 29, 2017
--- | --- | ---
Schedule of Available-for-sale Securities |  |
Amortized Cost | $ 24,023 | $ 32,721
Unrealized Gains | 0 | 14
Unrealized Losses | (86) | (22)
Fair Value | 23,937 | 32,713
Certificates of deposit |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 8,918 | 12,487
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 8,918 | 12,487
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 | 9,104 | 12,260
Unrealized Gains | 0 | 0
Unrealized Losses | (73) | (22)
Fair Value | 9,031 | 12,238
Municipal bonds |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 6,001 | 7,574
Unrealized Gains | 0 | 14
Unrealized Losses | (13) | 0
Fair Value | $ 5,988 | $ 7,588

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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + 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 + Details
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- Definition 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 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
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