Divestitures (Details)			3 Months Ended		12 Months Ended
	Oct. 22, 2023 USD ($)	Mar. 28, 2022 USD ($) restaurant	Jun. 26, 2022 USD ($)	Mar. 27, 2022 USD ($)	Dec. 31, 2023 USD ($)	Dec. 25, 2022 USD ($) restaurant
Assets Held for Sale
Goodwill allocated to the disposal group					$ 436,000	$ 9,908,000
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]				Refranchising and impairment loss
Impairment of franchise rights				$ 2,800,000
Disposal group, disposed of by sale, not discontinued operations
Assets Held for Sale
Net sale proceeds		$ 14,000,000
Non-cash charge			$ 8,400,000
Noncontrolling interest		4,200,000
Unearned royalty stream		$ 12,200,000
Unearned royalty stream recognition period		10 years
Goodwill allocated to the disposal group		$ 9,900,000
Disposal group, disposed of by sale, not discontinued operations | Corporate joint venture
Assets Held for Sale
Ownership percentage in divested joint venture		51.00%
Number of restaurants divested | restaurant		90				90
Disposal group, disposed of by sale, not discontinued operations | Preferred Marketing Solutions
Assets Held for Sale
Upfront consideration	$ 600,000
Quarterly royalty payments recognition period	10 years
Net assets of sold operations	$ 1,200,000
Property and equipment of sold operations	600,000
Goodwill of sold operations	$ 400,000
Gain (loss) on sale					$ 0