Income Taxes - Temporary Differences (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2020	Dec. 31, 2019	Jan. 01, 2019
Deferred tax assets:
Staff member benefits	$ 33,419	$ 27,059
Insurance reserves	11,460	14,157
Operating lease liability	319,274	311,043
Deferred income	31,119	22,725
Tax credit carryforwards	37,107	15,754
Goodwill	15,632
Stock-based compensation	9,937	8,794
State and foreign net operating loss carryforwards	3,536
Derivative asset	1,409
Other	1,466	1,958
Subtotal	464,359	401,490
Less: Valuation allowance	(1,041)	(713)
Total	463,318	400,777
Deferred tax liabilities:
Property and equipment	(124,634)	(133,206)
Prepaid expenses	(7,027)	(8,819)
Inventory	(7,766)	(7,713)
Accrued rent	(4,947)	(4,955)
Operating lease assets	(280,845)	(276,420)
Other	(214)	(136)
Total	(425,433)	(431,249)
Net deferred tax liability		(30,472)
Net deferred tax asset/(liability)	37,885
Reconciliation of beginning and ending amount of our uncertain tax positions
Balance at beginning of year	704	830	$ 843
Additions related to current period tax positions	49	13	104
Reductions related to settlements with taxing authorities and lapses of statutes of limitations		(139)	(117)
Balance at end of year	655	704	$ 830
Accrued interest and penalties related with uncertain tax positions	300	200
Decrease in uncertain tax positions during the next twelve months based on the lapses of statutes of limitations for certain jurisdictions	0
Tax credit carryforwards	1,900	1,900
Tax credit carryforward valuation allowance	1,000	700
State
Reconciliation of beginning and ending amount of our uncertain tax positions
Tax credit carryforwards	79,500
Foreign
Deferred tax assets:
Tax credit carryforwards	2,700	2,900
Federal
Reconciliation of beginning and ending amount of our uncertain tax positions
Tax credit carryforwards	$ 35,600	$ 14,300