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Investments - Sales and Maturities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 25, 2020 | Jan. 26, 2019 | Jan. 25, 2020 | Jan. 26, 2019
Sales of marketable securities |  |  |  |
Proceeds from sales | $ 11,517 | $ 6,550 | $ 23,887 | $ 14,304
Gross realized gains | 431 | 726 | 618 | 811
Gross realized losses | (62) | $ (261) | (150) | $ (327)
Fair value of available-for-sale securities by contractual maturity |  |  |  |
Within one year | 19,041 |  | 19,041 |
Within two to five years | 10,000 |  | 10,000 |
Within six to ten years | 1,639 |  | 1,639 |
Thereafter | 1,282 |  | 1,282 |
Total | $ 31,962 |  | $ 31,962 |

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