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Marketable Securities (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Mar. 25, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 201,325 | $ 99,868
Gross Unrealized Gains | 4 | 0
Gross Unrealized Losses | (2,433) | (55)
Estimated Fair Value (Net Carrying Amount) | 198,896 | 99,813
Corporate Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 185,636 | 33,350
Gross Unrealized Gains | 4 | 0
Gross Unrealized Losses | (2,318) | (20)
Estimated Fair Value (Net Carrying Amount) | 183,322 | 33,330
Non-US Government Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 14,730 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (111) |
Estimated Fair Value (Net Carrying Amount) | 14,619 |
Commercial paper |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 66,518
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | (35)
Estimated Fair Value (Net Carrying Amount) |  | $ 66,483
Certificates of deposit |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 500 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Estimated Fair Value (Net Carrying Amount) | 500 |
Agency discount notes |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 459 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (4) |
Estimated Fair Value (Net Carrying Amount) | $ 455 |

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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