Retirement Plans (Amount Recongized in the Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Jan. 02, 2016
Pensions [Member]
Liabilities [Abstract]
Other current liabilities	$ 0	$ 0
Other liabilities	102,205	98,382
Total liabilities	102,205	98,382
Supplemental Employee Retirement Plans [Member]
Liabilities [Abstract]
Other current liabilities	2,038	1,967
Other liabilities	14,983	15,031
Total liabilities	17,021	16,998
Other Postretirement Benefit Plans [Member]
Liabilities [Abstract]
Other current liabilities	148	130
Other liabilities	1,408	1,374
Total liabilities	$ 1,556	$ 1,504