Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2020	Dec. 29, 2019
Deferred tax assets
Accrued liabilities	$ 17,740	$ 16,686
Accrued bonuses	6,155	2,308
Other liabilities and asset reserves	18,763	16,244
Equity awards	6,760	7,196
Lease liability	32,374	30,756
Other	2,563	2,418
Net operating losses	8,139	8,205
Foreign tax credit carryforwards	14,405	10,049
Total deferred tax assets	106,899	93,862
Valuation allowances	(22,972)	(17,303)
Total deferred tax assets, net of valuation allowances	83,927	76,559
Deferred tax liabilities
Deferred expenses	(9,623)	(9,521)
Accelerated depreciation	(21,337)	(27,299)
Goodwill	(9,801)	(9,510)
Right-of-use asset	(32,065)	(30,257)
Other	(1,249)	(782)
Total deferred tax liabilities	(74,075)	(77,369)
Net deferred tax liabilities		(810)
Net deferred tax assets (liabilities)	9,852
Other tax disclosures
Net operating loss carryovers	8,000	6,600
Valuation allowance related to net operating losses	$ 8,000	6,600
Expiration term of foreign tax credit carryforwards	10 years
Foreign tax authority
Other tax disclosures
Net operating loss carryovers	$ 6,300	6,200
Valuation allowance related to net operating losses	600	500
Foreign tax credit carryforwards
Deferred tax assets
Valuation allowances	$ (14,400)	$ (10,000)