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Marketable Securities (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands | Sep. 28, 2019 | Mar. 30, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 258,410 | $ 228,757
Gross Unrealized Gains | 2,953 | 1,035
Gross Unrealized Losses | (59) | (641)
Estimated Fair Value (Net Carrying Amount) | 261,304 | 229,151
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 234,115 | 215,098
Gross Unrealized Gains | 2,810 | 1,027
Gross Unrealized Losses | (30) | (600)
Estimated Fair Value (Net Carrying Amount) | 236,895 | 215,525
Non-U.S. government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 14,404 | 13,209
Gross Unrealized Gains | 111 | 8
Gross Unrealized Losses | (7) | (40)
Estimated Fair Value (Net Carrying Amount) | 14,508 | 13,177
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 9,891 |
Gross Unrealized Gains | 32 |
Gross Unrealized Losses | (22) |
Estimated Fair Value (Net Carrying Amount) | $ 9,901 |
Agency discount notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 450
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (1)
Estimated Fair Value (Net Carrying Amount) |  | $ 449

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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=118939692&loc=d3e27161-111563 + Details
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