Marketable Securities (Schedule of Available-for-sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2013	Mar. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 252,905	$ 170,294
Gross Unrealized Gains	81	15
Gross Unrealized Losses	79	164
Estimated Fair Value (Net Carrying Amount)	252,907	170,145
Corporate Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	174,157	94,798
Gross Unrealized Gains	57	2
Gross Unrealized Losses	74	133
Estimated Fair Value (Net Carrying Amount)	174,140	94,667
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	43,722	34,380
Gross Unrealized Gains	8	4
Gross Unrealized Losses	5	3
Estimated Fair Value (Net Carrying Amount)	43,725	34,381
Agency Discount Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	4,014	1,027
Gross Unrealized Gains	2	0
Gross Unrealized Losses	0	0
Estimated Fair Value (Net Carrying Amount)	4,016	1,027
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	31,012	40,089
Gross Unrealized Gains	14	9
Gross Unrealized Losses	0	28
Estimated Fair Value (Net Carrying Amount)	$ 31,026	$ 40,070