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Investments - Sales and Maturities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 29, 2017 | Apr. 30, 2016 | Apr. 25, 2015
Sales of available-for-sale securities |  |  |
Proceeds from sales | $ 19,954 | $ 28,721 | $ 33,750
Gross realized gains | 926 | 997 | 285
Gross realized losses | (455) | $ (561) | $ (74)
Fair value of available-for-sale securities by contractual maturity |  |  |
Fair value, available-for-sale securities with contractual maturity within one year | 15,400 |  |
Fair value, available-for-sale securities with contractual maturity within two to five years | 20,500 |  |
Fair value, available-for-sale securities with contractual maturity within six to ten years | 1,500 |  |
Fair value, available-for-sale securities with contractual maturity after ten years | $ 200 |  |

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- Definition Fair value of available-for-sale debt securities maturing in the next 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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