Marketable Securities (Schedule of Cost and Estimated Fair Value of Available-for-sale Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 29, 2014	Mar. 30, 2013
Marketable Securities [Abstract]
Within 1 year, Amortized Cost	$ 263,418	$ 105,290
After 1 year, Amortized Cost	89,422	65,004
Within 1 year, Estimated Fair Value	263,417	105,235
After 1 year, Estimated Fair Value	89,243	64,910
Amortized Cost	352,840	170,294
Estimated Fair Value	$ 352,660	$ 170,145