Retirement Plans (Funded Status and Net Periodic Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2016	Dec. 27, 2014	Dec. 28, 2013
Reconciliation of Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 383,834
Service cost	2	$ 2	$ 0
Interest cost	14,061	14,870	13,716
Actuarial (gain) loss	8,877	3,220	7,779
Benefit obligation at end of year	362,899	383,834
Pensions [Member]
Reconciliation of Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	365,326	319,151
Service cost	0	0
Interest cost	13,341	14,027
Actuarial (gain) loss	(14,715)	55,821
Benefits paid	(18,051)	(23,673)
Benefit obligation at end of year	345,901	365,326	319,151
Supplemental Employee Retirement Plans [Member]
Reconciliation of Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	18,508	17,824
Service cost	0	0
Interest cost	656	754
Actuarial (gain) loss	(94)	1,925
Benefits paid	(2,072)	(1,995)
Benefit obligation at end of year	16,998	18,508	17,824
Other Postretirement Benefit Plans [Member]
Reconciliation of Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	1,789	2,075
Service cost	2	2
Interest cost	63	88
Actuarial (gain) loss	(274)	(254)
Benefits paid	(76)	(122)
Benefit obligation at end of year	$ 1,504	$ 1,789	$ 2,075