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Marketable Securities (Narrative) (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) security | Mar. 25, 2017 USD ($) security
Schedule of Available-for-sale Securities [Line Items] |  |
Gross unrealized losses | $ 2,433 | $ 55
Amortized cost on available for sale securities held at gross unrealized loss | $ 198,200 | $ 99,900
Number of securities | security | 0 | 4
Minimum |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity period for highly-rated securities | 1 year |
Maximum |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Maturity period for highly-rated securities | 3 years |

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