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Investments - Sales and Maturities (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jul. 24, 2021 | Jul. 25, 2020
Sales of marketable securities |  |
Proceeds from sales | $ 9,715 | $ 13,725
Gross realized gains | 267 | 126
Gross realized losses | (11) | $ (18)
Fair value of available-for-sale securities by contractual maturity |  |
Within one year | 17,506 |
Within two to five years | 15,351 |
Within six to ten years | 1,316 |
Thereafter | 1,694 |
Total | $ 35,867 |

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