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Marketable Securities (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands | Mar. 30, 2019 | Mar. 31, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 228,757 | $ 201,325
Gross Unrealized Gains | 1,035 | 4
Gross Unrealized Losses | (641) | (2,433)
Estimated Fair Value (Net Carrying Amount) | 229,151 | 198,896
Corporate debt securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 215,098 | 185,636
Gross Unrealized Gains | 1,027 | 4
Gross Unrealized Losses | (600) | (2,318)
Estimated Fair Value (Net Carrying Amount) | 215,525 | 183,322
Non-US government securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 13,209 | 14,730
Gross Unrealized Gains | 8 | 0
Gross Unrealized Losses | (40) | (111)
Estimated Fair Value (Net Carrying Amount) | 13,177 | 14,619
Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 500
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Estimated Fair Value (Net Carrying Amount) |  | 500
Agency discount notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 450 | 459
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1) | (4)
Estimated Fair Value (Net Carrying Amount) | $ 449 | $ 455

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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=82897076&loc=d3e27161-111563 + Details
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- Definition Amortized cost of 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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