Marketable Securities (Schedule of Available-for-sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 27, 2014	Mar. 29, 2014
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	$ 95,024	$ 352,660
Gross Unrealized Gains	6	73
Gross Unrealized Losses	(43)	(253)
Amortized Cost	95,061	352,840
Corporate Debt Securities - U.S. [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	78,538	246,685
Gross Unrealized Gains	2	52
Gross Unrealized Losses	(38)	(245)
Amortized Cost	78,574	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	16,486	41,970
Gross Unrealized Gains	4	10
Gross Unrealized Losses	(5)	(2)
Amortized Cost	16,487	41,962
Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value		5,002
Gross Unrealized Losses		(4)
Amortized Cost		$ 5,006