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Investments - Held-To-Maturity Securities (Details) - USD ($) $ in Thousands | Oct. 26, 2019 | Apr. 30, 2019
--- | --- | ---
Held To Maturity Securities |  |
Amortized Cost | $ 170,166 | $ 159,873
Gross Unrealized Gains | 203 | 100
Gross Unrealized Losses | (17) | (58)
Fair Value | 170,352 | 159,915
Municipal securities |  |
Held To Maturity Securities |  |
Amortized Cost | 26,776 | 5,332
Gross Unrealized Gains |  | 2
Gross Unrealized Losses | (6) | (1)
Fair Value | 26,770 | 5,333
U.S. government securities |  |
Held To Maturity Securities |  |
Amortized Cost | 65,826 | 70,609
Gross Unrealized Gains | 150 | 78
Gross Unrealized Losses |  | (52)
Fair Value | 65,976 | 70,635
Corporate bonds |  |
Held To Maturity Securities |  |
Amortized Cost | 76,543 | 83,932
Gross Unrealized Gains | 52 | 20
Gross Unrealized Losses | (11) | (5)
Fair Value | 76,584 | $ 83,947
Certificates of deposit |  |
Held To Maturity Securities |  |
Amortized Cost | 1,021 |
Gross Unrealized Gains | 1 |
Fair Value | $ 1,022 |

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- Definition Amount of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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