REVENUE FROM CONTRACTS WITH CUSTOMERS - Change in Contract Liabilities (Details) - Franchise revenue - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Sep. 25, 2024	Sep. 27, 2023	Dec. 27, 2023
Change in Contract with Customer, Liability [Roll Forward]
Loyalty rewards liability, beginning balance	$ 6,997	$ 6,377	$ 6,377
Revenue recognized - beginning balance	(477)	(545)
Additional contract liability	226	1,351
Loyalty rewards liability, ending balance	$ 6,746	$ 7,183	$ 6,997

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-2

Name:	us-gaap_ContractWithCustomerLiability
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant