Income Taxes - Temporary Differences (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 02, 2018	Jan. 03, 2017	Dec. 29, 2015
Deferred tax assets:
Staff member benefits	$ 22,626	$ 32,258
Insurance reserves	14,027	20,932
Accrued rent	12,523	20,583
Deferred income	11,607	14,409
Stock-based compensation	8,710	15,384
Tax credit carryforwards	2,308	2,247
Other	738	957
Subtotal	72,539	106,770
Less: Valuation allowance	(455)	(457)
Total	72,084	106,313
Deferred tax liabilities:
Property and equipment	(111,324)	(166,183)
Prepaid expenses	(9,120)	(12,192)
Inventory	(6,724)	(10,339)
Other	(2,132)
Total	(129,300)	(188,714)
Net deferred tax liability	(57,216)	(82,401)
Reconciliation of beginning and ending amount of our uncertain tax positions
Balance at beginning of year	829	1,067	$ 875
Additions related to current period tax positions	168	139	192
Reductions related to settlements with taxing authorities and lapses of statutes of limitations	(154)	(377)	0
Balance at end of year	843	829	$ 1,067
Accrued interest and penalties related with uncertain tax positions	100	100
Decrease in uncertain tax positions during the next twelve months based on the lapses of statutes of limitations for certain jurisdictions	0
State
Reconciliation of beginning and ending amount of our uncertain tax positions
Tax credit carryforwards	2,900	3,500
Tax credit carryforward valuation allowance	$ 500	$ 500