Marketable Securities (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Sep. 26, 2015	Mar. 28, 2015
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	$ 108,853	$ 184,318
Gross Unrealized Gains	11	10
Gross Unrealized Losses	(163)	(83)
Amortized Cost	109,005	184,391
Corporate Debt Securities - U.S. [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	97,346	153,836
Gross Unrealized Gains	8	8
Gross Unrealized Losses	(163)	(68)
Amortized Cost	97,501	153,896
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	11,507	27,995
Gross Unrealized Gains	3
Gross Unrealized Losses		(15)
Amortized Cost	$ 11,504	28,010
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value		2,487
Gross Unrealized Gains		2
Amortized Cost		$ 2,485