Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016	Dec. 28, 2014
Income Tax Disclosure [Abstract]
Deferred income on sale-leaseback of certain real estate	$ 2,848	$ 4,714
Lease financing obligations	173	254
Postretirement benefit expenses	877	1,255
Stock-based compensation expense	827	599
Federal net operating loss carryforwards	17,730	21,351
State net operating loss carryforwards	4,095	3,845
Goodwill and other intangibles, net	1,590	2,814
Occupancy costs	5,863	7,460
Tax credit carryforwards	24,982	21,987
Accrued vacation benefits	1,851	2,560
Accrued workers compensation	1,141	1,490
Accumulated other comprehensive income-postretirement benefits	326	499
Other	1,706	2,131
Gross deferred income tax assets	64,009	70,959
Less: Valuation allowance	0	0	$ (30,374)	$ (27,423)
Net deferred income tax assets	64,009	70,959
Inventory and other reserves	(116)	(97)
Property and equipment depreciation	(15,701)	(17,599)
Franchise rights	(20,545)	(24,422)
Deferred Tax Liabilities, Gross	(36,362)	(42,118)
Carrying value of net deferred income tax assets	$ 27,647	$ 28,841