Pension (detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Jul. 02, 2011
General Discussion Of Pension And Other Postretirement Benefits [Abstract]
Defined Benefit Plan, Service Cost	$ 2,221	$ 1,502
Defined Benefit Plan, Interest Cost	1,764	1,705
Defined Benefit Plan, Expected Return on Plan Assets	(2,291)	(1,957)
Defined Benefit Plan, Actuarial Net (Gains) Losses	338	374
Defined Benefit Plan, Amortization of Transition Obligations (Assets)	(57)	(69)
Defined Benefit Plan, Net Periodic Benefit Cost	$ 1,975	$ 1,555