Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Jan. 03, 2016	Dec. 28, 2014	Dec. 29, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Deferred income on sale-leaseback of certain real estate	$ 4,881	$ 5,857
Lease financing obligations	242	227
Postretirement benefit expenses	1,229	1,244
Stock-based compensation expense	378	273
Federal net operating loss carryforwards	17,696	11,091
State net operating loss carryforwards	3,795	3,077
Goodwill and other intangibles, net	2,639	2,641
Occupancy costs	7,120	7,017
Tax credit carryforwards	13,667	9,498
Accrued vacation benefits	2,314	2,020
Accrued workers compensation	2,087	2,020
Other	1,869	2,074
Gross deferred income tax assets	57,917	47,039
Less: Valuation allowance	(30,374)	(27,423)	$ (2,687)	$ (2,063)
Net deferred income tax assets	27,543	19,616
Property and equipment depreciation	(3,803)	4,080
Accumulated other comprehensive income-postretirement benefits	(42)	(34)
Inventory and other reserves	(103)	(246)
Franchise rights	(23,595)	(23,416)
Deferred Tax Liabilities, Gross	(27,543)	(19,616)
Carrying value of net deferred income tax assets	$ 0	$ 0