Cash And Cash Equivalents And Investments (Schedule Of Investments By Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 28, 2013	Mar. 30, 2013
Available-for-sale securities:
Total short-term investments	$ 146,571	$ 123,847
Total long-term investments		13,800
Short-term Investments [Member]
Trading securities:
Due in one year or less	10,193	9,673
Available-for-sale securities:
Due in 12 months or less	46,386	45,190
Due in 12 to 24 months	54,110	23,019
Due in 24 to 36 months	25,691	32,345
Due in 36 to 49 months	10,191	13,620
Total short-term investments	146,571	123,847
Long-term Investments [Member]
Available-for-sale securities:
Due after ten years		$ 13,800