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Investments - Sales and Maturities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 28, 2018 | Apr. 29, 2017 | Apr. 30, 2016
Sales of available-for-sale securities |  |  |
Proceeds from sales | $ 22,674 | $ 19,954 | $ 28,721
Gross realized gains | 1,302 | 926 | 997
Gross realized losses | (532) | $ (455) | $ (561)
Fair value of available-for-sale securities by contractual maturity |  |  |
Fair value, available-for-sale securities with contractual maturity within one year | 12,900 |  |
Fair value, available-for-sale securities with contractual maturity within two to five years | 21,000 |  |
Fair value, available-for-sale securities with contractual maturity within six to ten years | 1,400 |  |
Fair value, available-for-sale securities with contractual maturity after ten years | $ 1,000 |  |

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