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Marketable Securities (Narrative) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 27, 2021 USD ($) security | Mar. 28, 2020 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |
Gross unrealized losses | $ 315 | $ 3,993
Amortized cost on available for sale securities held at gross unrealized loss | $ 92,000 | $ 172,900
Securities in a continuous unrealized loss position for more than 12 months, number of securities | security | 0 |
Minimum |  |
Debt Securities, Available-for-sale [Line Items] |  |
Maturity period for highly-rated securities | 1 year |
Maximum |  |
Debt Securities, Available-for-sale [Line Items] |  |
Maturity period for highly-rated securities | 3 years |

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