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. 30, 2013	Mar. 31, 2012
Marketable Securities [Abstract]
Within 1 year, Amortized Cost	$ 105,290	$ 115,871
After 1 year, Amortized Cost	65,004	2,912
Within 1 year, Estimated Fair Value	105,235	115,876
After 1 year, Estimated Fair Value	64,910	2,915
Amortized Cost	170,294	118,783
Estimated Fair Value	$ 170,145	$ 118,791

Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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Amount of available-for-sale debt securities at cost, net of adjustments, which include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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- Definition

Amount of available-for-sale debt securities at cost, net of adjustments, maturing in the next fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings (less any cumulative-effect adjustments, as defined) and fair value hedge accounting adjustments.

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- Definition

Amount of debt securities categorized neither as held-to-maturity nor trading.

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