Postretirement Benefits Amounts Recognized in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 01, 2017	Jan. 03, 2016
Defined Benefit Plan Disclosure [Line Items]
Prior service cost	$ 1,972	$ 2,327
Net gain	(3,272)	(2,218)
Deferred Tax Liabilities, Other Comprehensive Income	0	(42)
Deferred Tax Assets, Other Comprehensive Loss	499	0
Accumulated other comprehensive income	(1,203)	(335)
Accumulated Defined Benefit Plans Adjustment, Net Unamortized Gain (Loss) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year	211
Accumulated Defined Benefit Plans Adjustment, Net Prior Service Cost (Credit) [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Amount to be Amortized from Accumulated Other Comprehensive Income (Loss) Next Fiscal Year	(355)
Other Comprehensive Income (Loss) [Member]
Defined Benefit Plan Disclosure [Line Items]
Deferred Tax Liabilities, Other Comprehensive Income		$ (444)
Deferred Tax Assets, Other Comprehensive Loss	$ 97