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Investments - Sales and Maturities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 28, 2017 | Apr. 29, 2017 | Oct. 28, 2017 | Oct. 29, 2016
Sales of available-for-sale securities |  |  |  |
Proceeds from sales | $ 5,672 | $ 6,087 | $ 11,529 | $ 9,757
Gross realized gains | 16 | 16 | 418 | 47
Gross realized losses | (7) | $ (2) | (228) | $ (38)
Fair value of available-for-sale securities by contractual maturity |  |  |  |
Fair value, available-for-sale securities with contractual maturity within one year | 12,100 |  | 12,100 |
Fair value, available-for-sale securities with contractual maturity within two to five years | 23,400 |  | 23,400 |
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 | $ 400 |  | $ 400 |

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