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Investments - Sales and Maturities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 23, 2021 | Jan. 25, 2020 | Jan. 23, 2021 | Jan. 25, 2020
Sales of marketable securities |  |  |  |
Proceeds from sales | $ 6,807 | $ 11,517 | $ 23,824 | $ 23,887
Gross realized gains | 169 | 431 | 479 | 618
Gross realized losses | (15) | $ (62) | (41) | $ (150)
Fair value of available-for-sale securities by contractual maturity |  |  |  |
Within one year | 17,678 |  | 17,678 |
Within two to five years | 12,472 |  | 12,472 |
Within six to ten years | 1,114 |  | 1,114 |
Thereafter | 1,668 |  | 1,668 |
Total | $ 32,932 |  | $ 32,932 |

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