Marketable Securities (Schedule of Available-for-sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2014	Mar. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value (Net Carrying Amount)	$ 352,660	$ 170,145
Gross Unrealized Losses	(253)	(164)
Gross Unrealized Gains	73	15
Amortized Cost	352,840	170,294
Corporate Debt Securities - U.S. [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value (Net Carrying Amount)	246,685	94,667
Gross Unrealized Losses	(245)	(133)
Gross Unrealized Gains	52	2
Amortized Cost	246,878	94,798
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value (Net Carrying Amount)	56,994	34,381
Gross Unrealized Losses	(2)	(3)
Gross Unrealized Gains	10	4
Amortized Cost	56,986	34,380
Agency Discount Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value (Net Carrying Amount)	2,009	1,027
Gross Unrealized Gains	1
Amortized Cost	2,008	1,027
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value (Net Carrying Amount)	41,970	40,070
Gross Unrealized Losses	(2)	(28)
Gross Unrealized Gains	10	9
Amortized Cost	41,962	40,089
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