Pension (detail) - USD ($)	3 Months Ended
	Jul. 01, 2017	Jul. 02, 2016
General Discussion Of Pension And Other Postretirement Benefits [Abstract]
Defined Benefit Plan, Service Cost	$ 1,981,000	$ 2,159,000
Defined Benefit Plan, Interest Cost	1,985,000	1,919,000
Defined Benefit Plan, Expected Return on Plan Assets	(3,482,000)	(2,978,000)
Defined Benefit Plan, Actuarial Net (Gains) Losses	0	679,000
Defined Benefit Plan, Amortization of Transition Obligations (Assets)	30,000	27,000
Defined Benefit Plan, Net Periodic Benefit Cost	$ 514,000	1,806,000
Defined Benefit Plan, Contributions by Employer		$ 300,000