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Investments - Sales and Maturities (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jul. 28, 2018 | Jul. 29, 2017
Sales of available-for-sale securities |  |
Proceeds from sales | $ 4,762 | $ 5,857
Gross realized gains | 75 | 402
Gross realized losses | (55) | $ (221)
Fair value of available-for-sale securities by contractual maturity |  |
Fair value, available-for-sale securities with contractual maturity within one year | 12,500 |
Fair value, available-for-sale securities with contractual maturity within two to five years | 18,900 |
Fair value, available-for-sale securities with contractual maturity within six to ten years | 1,200 |
Fair value, available-for-sale securities with contractual maturity after ten years | $ 1,000 |

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- Definition Fair value of available-for-sale debt securities maturing in the sixth through tenth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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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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