Marketable Securities (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Dec. 26, 2015	Mar. 28, 2015
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	$ 89,475	$ 184,318
Gross Unrealized Gains		10
Gross Unrealized Losses	(256)	(83)
Amortized Cost	89,731	184,391
Corporate Debt Securities - U.S. [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	89,475	153,836
Gross Unrealized Gains		8
Gross Unrealized Losses	(256)	(68)
Amortized Cost	$ 89,731	153,896
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value		27,995
Gross Unrealized Losses		(15)
Amortized Cost		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