Income Taxes Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 30, 2018	Dec. 31, 2017	Jan. 01, 2017	Jan. 03, 2016
Income Tax Disclosure [Abstract]
Deferred income on sale-leaseback of certain real estate	$ 2,505	$ 2,848
Lease financing obligations	182	173
Postretirement benefit expenses	935	877
Stock-based compensation expense	1,326	827
Federal net operating loss carryforwards	18,955	17,730
State net operating loss carryforwards	3,902	4,095
Goodwill and other intangibles, net	1,301	1,590
Occupancy costs	6,091	5,863
Tax credit carryforwards	28,827	24,982
Accrued vacation benefits	2,060	1,851
Accrued workers compensation	1,189	1,141
Accumulated other comprehensive income-postretirement benefits	140	326
Other	1,983	1,706
Less: Valuation allowance	0	0	$ 0	$ (30,374)
Net deferred income tax assets	69,396	64,009
Inventory and other reserves	(167)	(116)
Property and equipment depreciation	(19,870)	(15,701)
Franchise rights	(21,068)	(20,545)
Deferred Tax Liabilities, Gross	(41,105)	(36,362)
Carrying value of net deferred income tax assets	$ 28,291	$ 27,647