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Investments - Sales and Maturities (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 27, 2024 | Jan. 28, 2023 | Jan. 27, 2024 | Jan. 28, 2023
Sales of Marketable Securities |  |  |  |
Proceeds from sales | $ 1,381 | $ 5,514 | $ 21,849 | $ 18,178
Gross realized gains | 33 | 3 | 1,909 | 52
Gross realized losses | 0 | $ (81) | (740) | $ (207)
Fair Value of Available-For-Sale Securities By Contractual Maturity |  |  |  |
Within one year | 6,445 |  | 6,445 |
Securities not due at a single maturity date | 6,600 |  | 6,600 |
Total | $ 13,045 |  | $ 13,045 |

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