Marketable Securities (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Sep. 23, 2017	Mar. 25, 2017
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 148,993	$ 99,868
Gross Unrealized Gains	103	0
Gross Unrealized Losses	(103)	(55)
Estimated Fair Value (Net Carrying Amount)	148,993	99,813
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	135,219	33,350
Gross Unrealized Gains	103	0
Gross Unrealized Losses	(89)	(20)
Estimated Fair Value (Net Carrying Amount)	135,233	33,330
Non-US government securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	11,817
Gross Unrealized Gains	0
Gross Unrealized Losses	(14)
Estimated Fair Value (Net Carrying Amount)	11,803
US Treasury securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	998
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Estimated Fair Value (Net Carrying Amount)	998
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	0
Estimated Fair Value (Net Carrying Amount)	$ 459
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

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
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