Marketable Securities (Schedule of Available-for-sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 28, 2015	Mar. 29, 2014
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value (Net Carrying Amount)	$ 184,318	$ 352,660
Gross Unrealized Losses	(83)	(253)
Corporate Debt Securities - U.S. [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value (Net Carrying Amount)	153,836	246,685
Gross Unrealized Losses	(68)	(245)
Gross Unrealized Gains	8	52
Amortized Cost	153,896	246,878
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value (Net Carrying Amount)	2,487	41,970
Gross Unrealized Losses		(2)
Gross Unrealized Gains	2	10
Amortized Cost	2,485	41,962
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value (Net Carrying Amount)	27,995	56,994
Gross Unrealized Losses	(15)	(2)
Gross Unrealized Gains		10
Amortized Cost	28,010	56,986
Agency Discount Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value (Net Carrying Amount)		2,009
Gross Unrealized Gains		1
Amortized Cost		2,008
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value (Net Carrying Amount)		5,002
Gross Unrealized Losses		(4)
Amortized Cost		$ 5,006