Marketable Securities (Schedule of Available-for-sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 28, 2014	Mar. 29, 2014
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	$ 115,150	$ 352,660
Gross Unrealized Gains	17	73
Gross Unrealized Losses	(103)	(253)
Amortized Cost	115,236	352,840
Corporate Debt Securities - U.S. [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	93,670	246,685
Gross Unrealized Gains	9	52
Gross Unrealized Losses	(98)	(245)
Amortized Cost	93,759	246,878
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value		56,994
Gross Unrealized Gains		10
Gross Unrealized Losses		(2)
Amortized Cost		56,986
Agency Discount Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value		2,009
Gross Unrealized Gains		1
Amortized Cost		2,008
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	16,474	41,970
Gross Unrealized Gains	7	10
Gross Unrealized Losses	(5)	(2)
Amortized Cost	16,472	41,962
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	5,006	5,002
Gross Unrealized Gains	1
Gross Unrealized Losses		(4)
Amortized Cost	$ 5,005	$ 5,006