Marketable Securities (Schedule of Cost and Estimated Fair Value of Available-for-sale Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Jun. 27, 2015	Mar. 28, 2015
Marketable Securities [Abstract]
Within 1 year, Amortized Cost	$ 120,288	$ 124,275
After 1 year, Amortized Cost	50,788	60,116
Within 1 year, Estimated Fair Value	120,226	124,246
After 1 year, Estimated Fair Value	50,629	60,072
Amortized Cost	171,076	184,391
Estimated Fair Value	$ 170,855	$ 184,318