Retirement Plans (Amounts Recognized in Accumulated Other Comprehensive Income) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 28, 2013	Dec. 29, 2012
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract]
Net actuarial loss	$ 60,338	$ 110,682
Prior service cost	0	0
Total	60,338	110,682
Supplemental Employee Retirement Plans, Defined Benefit [Member]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract]
Net actuarial loss	4,158	4,766
Prior service cost	0	0
Total	4,158	4,766
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), after Tax [Abstract]
Net actuarial loss	(614)	(200)
Prior service cost	44	(23)
Total	$ (570)	$ (223)