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Marketable Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands | Oct. 27, 2018 | Apr. 28, 2018
--- | --- | ---
Schedule of Available-for-sale Securities |  |
Amortized Cost | $ 31,848 | $ 34,676
Unrealized Losses | (127) | (154)
Fair Value | 31,721 | 34,522
Certificates of deposit |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 5,196 | 8,669
Unrealized Losses | 0 | 0
Fair Value | 5,196 | 8,669
U.S. Government securities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 7,240 | 999
Unrealized Losses | (9) | (7)
Fair Value | 7,231 | 992
U.S. Government sponsored entities |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 16,090 | 20,072
Unrealized Losses | (104) | (123)
Fair Value | 15,986 | 19,949
Municipal bonds |  |
Schedule of Available-for-sale Securities |  |
Amortized Cost | 3,322 | 4,936
Unrealized Losses | (14) | (24)
Fair Value | $ 3,308 | $ 4,912

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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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