Pension (detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 29, 2012	Oct. 01, 2011	Sep. 29, 2012	Oct. 01, 2011
General Discussion Of Pension And Other Postretirement Benefits [Abstract]
Defined Benefit Plan, Service Cost	$ 2,223	$ 1,501	$ 4,444	$ 3,003
Defined Benefit Plan, Interest Cost	1,763	1,705	3,527	3,410
Defined Benefit Plan, Expected Return on Plan Assets	(2,291)	(1,957)	(4,582)	(3,914)
Defined Benefit Plan, Actuarial Net (Gains) Losses	337	375	675	749
Defined Benefit Plan, Amortization of Transition Obligations (Assets)	(57)	(69)	(114)	(138)
Defined Benefit Plan, Net Periodic Benefit Cost	$ 1,975	$ 1,555	$ 3,950	$ 3,110