Marketable Securities (Schedule of Cost and Estimated Fair Value of Available-for-sale Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 27, 2014	Mar. 29, 2014
Marketable Securities [Abstract]
Within 1 year, Amortized Cost	$ 85,821	$ 263,418
After 1 year, Amortized Cost	9,240	89,422
Within 1 year, Estimated Fair Value	85,796	263,417
After 1 year, Estimated Fair Value	9,228	89,243
Amortized Cost	95,061	352,840
Estimated Fair Value	$ 95,024	$ 352,660