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Marketable Securities (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands | Sep. 26, 2020 | Mar. 28, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 358,550 | $ 307,990
Gross Unrealized Gains | 6,409 | 1,584
Gross Unrealized Losses | (63) | (3,993)
Estimated Fair Value (Net Carrying Amount) | 364,896 | 305,581
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 342,943 | 286,668
Gross Unrealized Gains | 6,136 | 1,157
Gross Unrealized Losses | (63) | (3,993)
Estimated Fair Value (Net Carrying Amount) | 349,016 | 283,832
Non-U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 10,520 | 12,483
Gross Unrealized Gains | 250 | 260
Gross Unrealized Losses | 0 | 0
Estimated Fair Value (Net Carrying Amount) | 10,770 | 12,743
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 1,263 | 8,839
Gross Unrealized Gains | 18 | 167
Gross Unrealized Losses | 0 | 0
Estimated Fair Value (Net Carrying Amount) | 1,281 | $ 9,006
Agency discount notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 3,824 |
Gross Unrealized Gains | 5 |
Gross Unrealized Losses | 0 |
Estimated Fair Value (Net Carrying Amount) | $ 3,829 |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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