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Investments - Sales and Maturities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 26, 2019 | Jan. 27, 2018 | Jan. 26, 2019 | Jan. 27, 2018
Sales of available-for-sale securities |  |  |  |
Proceeds from sales | $ 6,550 | $ 5,580 | $ 14,304 | $ 17,109
Gross realized gains | 726 | 870 | 811 | 1,288
Gross realized losses | (261) | $ (284) | (327) | $ (512)
Fair value of available-for-sale securities by contractual maturity |  |  |  |
Fair value, available-for-sale securities with contractual maturity within one year | 14,600 |  | 14,600 |
Fair value, available-for-sale securities with contractual maturity within two to five years | 16,900 |  | 16,900 |
Fair value, available-for-sale securities with contractual maturity within six to ten years | 1,400 |  | 1,400 |
Fair value, available-for-sale securities with contractual maturity after ten years | $ 800 |  | $ 800 |

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- Definition The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
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