Summary of Significant Accounting Policies (Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 30, 2013	Mar. 31, 2012	Mar. 31, 2011
Accounting Policies [Abstract]
Unrealized gain on available-for-sale investments, before tax	$ 362,000	$ 176,000
Tax on unrealized gain on available-for-sale investments	124,000	60,000
Unrealized gain on available-for-sale securities, net of tax	$ 238	$ 116	$ 0