Fair Value (Schedule Of Level 3 Assets) (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended		9 Months Ended
	Dec. 29, 2012	Mar. 31, 2012	Dec. 29, 2012 Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member]	Dec. 29, 2012 Fair Value, Inputs, Level 3 [Member]	Dec. 31, 2011 Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Beginning balance	$ 142,856	$ 153,490	$ 13,700	$ 28,200	$ 25,900	$ 30,200
Total unrealized gains included in other comprehensive income			50	100	600	500
Redemption of investments in ARS			(250)	(2,300)	(13,000)	(4,700)
Ending Balance	$ 142,856	$ 153,490	$ 13,500	$ 26,000	$ 13,500	$ 26,000