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Investments - Sales and Maturities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 28, 2017 | Jan. 23, 2016 | Jan. 28, 2017 | Jan. 23, 2016
Sales of available-for-sale securities |  |  |  |
Proceeds from sales | $ 4,142 | $ 4,487 | $ 13,899 | $ 23,896
Gross realized gains | 866 | 267 | 913 | 970
Gross realized losses | (366) | $ (18) | (404) | $ (557)
Fair value of available-for-sale securities by contractual maturity |  |  |  |
Fair value, available-for-sale securities with contractual maturity within one year | 14,100 |  | 14,100 |
Fair value, available-for-sale securities with contractual maturity within two to five years | 18,300 |  | 18,300 |
Fair value, available-for-sale securities with contractual maturity within six to ten years | 1,300 |  | 1,300 |
Fair value, available-for-sale securities with contractual maturity after ten years | $ 300 |  | $ 300 |

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