Pension (detail) (USD $)	3 Months Ended		9 Months Ended
	Dec. 28, 2013	Dec. 29, 2012	Dec. 28, 2013	Dec. 29, 2012
General Discussion Of Pension And Other Postretirement Benefits [Abstract]
Defined Benefit Plan, Service Cost	$ 1,862,000	$ 2,925,000	$ 5,588,000	$ 7,369,000
Defined Benefit Plan, Interest Cost	1,890,000	1,764,000	5,670,000	5,291,000
Defined Benefit Plan, Expected Return on Plan Assets	(2,373,000)	(2,291,000)	(7,118,000)	(6,873,000)
Defined Benefit Plan, Actuarial Net (Gains) Losses	585,000	338,000	1,752,000	1,013,000
Defined Benefit Plan, Amortization of Transition Obligations (Assets)	0	(56,000)	0	(170,000)
Defined Benefit Plan, Net Periodic Benefit Cost	1,964,000	2,680,000	5,892,000	6,630,000
Defined Benefit Plan, Contributions by Employer	$ 2,000,000	$ 3,000,000