Marketable Securities (Schedule of Cost and Estimated Fair Value of Available-for-sale Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Dec. 24, 2016	Mar. 26, 2016
Marketable Securities [Abstract]
Within 1 year, Amortized Cost	$ 72,406	$ 60,603
After 1 year, Amortized Cost		20,707
Amortized Cost	72,406	81,310
Within 1 year, Estimated Fair Value	72,342	60,582
After 1 year, Estimated Fair Value		20,631
Estimated Fair Value	$ 72,342	$ 81,213