Marketable Securities (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Jun. 27, 2015	Mar. 28, 2015
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	$ 170,855	$ 184,318
Gross Unrealized Gains	4	10
Gross Unrealized Losses	(225)	(83)
Amortized Cost	171,076	184,391
Corporate Debt Securities - U.S. [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	156,859	153,836
Gross Unrealized Gains	2	8
Gross Unrealized Losses	(223)	(68)
Amortized Cost	157,080	153,896
U.S. Treasury Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	11,504	27,995
Gross Unrealized Losses	(2)	(15)
Amortized Cost	11,506	28,010
Commercial Paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Estimated Fair Value	2,492	2,487
Gross Unrealized Gains	2	2
Amortized Cost	$ 2,490	$ 2,485