Pension (detail) (USD $)	3 Months Ended		9 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Dec. 29, 2012	Dec. 31, 2011
General Discussion Of Pension And Other Postretirement Benefits [Abstract]
Defined Benefit Plan, Service Cost	$ 2,925,000	$ 761,000	$ 7,369,000	$ 3,763,000
Defined Benefit Plan, Interest Cost	1,764,000	1,705,000	5,291,000	5,115,000
Defined Benefit Plan, Expected Return on Plan Assets	(2,291,000)	(1,957,000)	(6,873,000)	(5,871,000)
Defined Benefit Plan, Actuarial Net (Gains) Losses	338,000	374,000	1,013,000	1,123,000
Defined Benefit Plan, Amortization of Transition Obligations (Assets)	(56,000)	(69,000)	(170,000)	(207,000)
Defined Benefit Plan, Net Periodic Benefit Cost	2,680,000	814,000	6,630,000	3,923,000
Defined Benefit Plan, Contributions by Employer	$ 3,000,000	$ 15,400,000