Pension (detail) - USD ($)	3 Months Ended		9 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 26, 2015	Dec. 27, 2014
General Discussion Of Pension And Other Postretirement Benefits [Abstract]
Defined Benefit Plan, Service Cost	$ 2,473,000	$ 2,129,000	$ 7,418,000	$ 6,386,000
Defined Benefit Plan, Interest Cost	2,226,000	2,059,000	6,677,000	6,177,000
Defined Benefit Plan, Expected Return on Plan Assets	(2,769,000)	(2,841,000)	(8,306,000)	(8,520,000)
Defined Benefit Plan, Actuarial Net (Gains) Losses	964,000	88,000	2,891,000	263,000
Defined Benefit Plan, Amortization of Transition Obligations (Assets)	27,000		82,000
Defined Benefit Plan, Net Periodic Benefit Cost	$ 2,921,000	$ 1,435,000	8,762,000	4,306,000
Defined Benefit Plan, Contributions by Employer			$ 23,100,000	$ 350,000