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Investments - Sales and Maturities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2016 | Apr. 25, 2015 | Apr. 26, 2014
Sales of available-for-sale securities |  |  |
Proceeds from sales | $ 28,721 | $ 33,750 | $ 34,557
Gross realized gains | 997 | 285 | 857
Gross realized losses | (561) | $ (74) | $ (559)
Fair value of available-for-sale securities by contractual maturity |  |  |
Fair value, available-for-sale securities with contractual maturity within one year | 13,600 |  |
Fair value, available-for-sale securities with contractual maturity within two to five years | 21,200 |  |
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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