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Investments - Sales and Maturities (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jul. 25, 2020 | Jul. 27, 2019
Sales of marketable securities |  |
Proceeds from sales | $ 13,725 | $ 4,060
Gross realized gains | 126 | 6
Gross realized losses | (18) | $ (2)
Fair value of available-for-sale securities by contractual maturity |  |
Within one year | 9,366 |
Within two to five years | 6,583 |
Within six to ten years | 1,266 |
Thereafter | 1,843 |
Total | $ 19,058 |

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