Impairment of Long-Lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jul. 04, 2021	Jun. 28, 2020	Jul. 04, 2021	Jun. 28, 2020
Impairment of Long-Lived Assets
Impairment of long-lived assets	$ 630	$ 117	$ 1,265	$ 4,704
Company-operated restaurants
Impairment of Long-Lived Assets
Impairment of long-lived assets	488	0	934	4,395
Restaurants leased or subleased to franchisees
Impairment of Long-Lived Assets
Impairment of long-lived assets	0	0	189	0
Surplus properties
Impairment of Long-Lived Assets
Impairment of long-lived assets	$ 142	$ 117	$ 142	$ 309

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

Name:	us-gaap_AssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration