Retirement Plans (Amount Recongized in the Balance Sheet) (Details) - USD ($) $ in Thousands	Jan. 02, 2016	Dec. 27, 2014
Pensions [Member]
Liabilities [Abstract]
Other current liabilities	$ 0	$ 0
Other liabilities	98,382	97,691
Total liabilities	98,382	97,691
Supplemental Employee Retirement Plans [Member]
Liabilities [Abstract]
Other current liabilities	1,967	1,989
Other liabilities	15,031	16,519
Total liabilities	16,998	18,508
Other Postretirement Benefit Plans [Member]
Liabilities [Abstract]
Other current liabilities	130	164
Other liabilities	1,374	1,625
Total liabilities	$ 1,504	$ 1,789