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Investments - Sales and Maturities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 27, 2018 | Jan. 28, 2017 | Jan. 27, 2018 | Jan. 28, 2017
Sales of available-for-sale securities |  |  |  |
Proceeds from sales | $ 5,580 | $ 4,142 | $ 17,109 | $ 13,899
Gross realized gains | 870 | 866 | 1,288 | 913
Gross realized losses | (284) | $ (366) | (512) | $ (404)
Fair value of available-for-sale securities by contractual maturity |  |  |  |
Fair value, available-for-sale securities with contractual maturity within one year | 12,800 |  | 12,800 |
Fair value, available-for-sale securities with contractual maturity within two to five years | 22,500 |  | 22,500 |
Fair value, available-for-sale securities with contractual maturity within six to ten years | 1,500 |  | 1,500 |
Fair value, available-for-sale securities with contractual maturity after ten years | $ 700 |  | $ 700 |

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