Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jan. 01, 2017	Jan. 03, 2016	Dec. 28, 2014	Dec. 29, 2013
Income Tax Disclosure [Abstract]
Deferred income on sale-leaseback of certain real estate	$ 4,714	$ 4,881
Lease financing obligations	254	242
Postretirement benefit expenses	1,255	1,229
Stock-based compensation expense	599	378
Federal net operating loss carryforwards	21,351	17,696
State net operating loss carryforwards	3,845	3,795
Goodwill and other intangibles, net	2,814	2,639
Occupancy costs	7,460	7,120
Tax credit carryforwards	21,987	13,667
Accrued vacation benefits	2,560	2,314
Accrued workers compensation	1,490	2,087
Accumulated other comprehensive income-postretirement benefits	499	0
Other	2,131	1,869
Gross deferred income tax assets	70,959	57,917
Less: Valuation allowance	0	(30,374)	$ (27,423)	$ (2,687)
Net deferred income tax assets	70,959	27,543
Accumulated other comprehensive income-postretirement benefits	0	(42)
Inventory and other reserves	(97)	(103)
Property and equipment depreciation	(17,599)	(3,803)
Franchise rights	(24,422)	(23,595)
Deferred Tax Liabilities, Gross	(42,118)	(27,543)
Carrying value of net deferred income tax assets	$ 28,841	$ 0