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

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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-Publisher FASB
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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