Goodwill (Details) $ in Thousands		12 Months Ended
	Mar. 28, 2022 USD ($) restaurant	Dec. 31, 2023 USD ($) restaurant	Dec. 25, 2022 USD ($) restaurant	Oct. 22, 2023 USD ($)
Goodwill [Roll Forward]
Beginning balance		$ 70,616	$ 80,632
Acquisitions		5,376	1,161
Divestitures		(436)	(9,908)
Foreign currency adjustments		650	(1,269)
Ending balance		76,206	$ 70,616
Number of stores acquired | restaurant			2
Disposal group, disposed of by sale, not discontinued operations
Goodwill [Roll Forward]
Divestitures	$ (9,900)
Disposal group, disposed of by sale, not discontinued operations | Preferred Marketing Solutions
Goodwill [Roll Forward]
Goodwill of sold operations				$ 400
Disposal group, disposed of by sale, not discontinued operations | Corporate joint venture
Goodwill [Roll Forward]
Ownership percentage in divested joint venture	51.00%
Number of restaurants divested | restaurant	90		90
UK franchisee acquisitions
Goodwill [Roll Forward]
Acquisitions		4,300
Domestic restaurant acquisitions
Goodwill [Roll Forward]
Acquisitions		$ 1,100
Number of stores acquired | restaurant		10
Domestic Company-owned restaurants
Goodwill [Roll Forward]
Beginning balance		$ 55,507	$ 64,254
Acquisitions		1,102	1,161
Divestitures		0	(9,908)
Foreign currency adjustments		0	0
Ending balance		56,609	55,507
International
Goodwill [Roll Forward]
Beginning balance		14,673	15,942
Acquisitions		4,274	0
Divestitures		0	0
Foreign currency adjustments		650	(1,269)
Ending balance		19,597	14,673
All others
Goodwill [Roll Forward]
Beginning balance		436	436
Acquisitions		0	0
Divestitures		(436)	0
Foreign currency adjustments		0	0
Ending balance		$ 0	$ 436