Retirement Plans (Amounts Recognized in Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	Jan. 02, 2016	Dec. 27, 2014
Pensions [Member]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract]
Net actuarial loss (gain)	$ 119,712	$ 115,438
Prior service cost	0	0
Total	119,712	115,438
Supplemental Employee Retirement Plans [Member]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract]
Net actuarial loss (gain)	5,438	5,872
Prior service cost	0	0
Total	5,438	5,872
Other Postretirement Benefit Plans [Member]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract]
Net actuarial loss (gain)	(1,045)	(830)
Prior service cost	44	44
Total	$ (1,001)	$ (786)