Marketable Securities (Schedule of Cost and Estimated Fair Value of Available-for-sale Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 25, 2016	Mar. 26, 2016
Marketable Securities [Abstract]
Within 1 year, Amortized Cost	$ 91,109	$ 60,603
After 1 year, Amortized Cost	3,934	20,707
Amortized Cost	95,043	81,310
Within 1 year, Estimated Fair Value	91,090	60,582
After 1 year, Estimated Fair Value	3,923	20,631
Estimated Fair Value	$ 95,013	$ 81,213