Segment Reporting (Details) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Jul. 02, 2023 USD ($)	Apr. 02, 2023 USD ($)	Jun. 30, 2024 USD ($) segment	Jul. 02, 2023 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment					3
Total net revenues	$ 438,809		$ 408,882		$ 881,507	$ 827,832
Segment adjusted EBITDA	54,726		48,814		112,914	103,742
Interest expense, net	14,452		12,063		28,188	24,051
Income tax (benefit)/expense	(3,611)		(7,563)		651	(7,246)
Depreciation and amortization expense	34,600		29,196		68,186	57,135
Share-based compensation	7,648		4,824		14,634	10,369
Employer payroll taxes related to share-based compensation	207		189		250	214
Other non-operating expense, net	949		1,061		1,522	2,060
Strategic initiatives	4,187		4,477		9,008	17,946
Acquisition and integration expenses	851		339		1,099	430
New market penetration expenses	572		241		1,038	335
Shop closure expenses	628		1,484		767	805
Restructuring and severance expenses	132		1,667		138	2,247
Gain on sale-leaseback	0		15		0	(9,646)
Other	(958)		737		(973)	3,314
Net (loss)/income	(4,931)	$ (6,663)	84	$ 1,644	(11,594)	1,728
Strategic Initiatives
Segment Reporting Information [Line Items]
Global transformation, strategic alternatives, and McDonald's expansion	3,900				8,500
Corporate
Segment Reporting Information [Line Items]
Segment adjusted EBITDA	(12,472)		(14,468)		(29,336)	(28,608)
U.S.
Segment Reporting Information [Line Items]
Total net revenues	289,304		267,417		585,239	548,761
U.S. | Operating Segments
Segment Reporting Information [Line Items]
Segment adjusted EBITDA	32,668		28,085		75,284	66,620
International
Segment Reporting Information [Line Items]
Total net revenues	125,269		120,588		250,019	232,576
International | Operating Segments
Segment Reporting Information [Line Items]
Segment adjusted EBITDA	21,655		24,702		42,191	43,684
Market Development
Segment Reporting Information [Line Items]
Total net revenues	24,236		20,877		46,249	46,495
Market Development | Operating Segments
Segment Reporting Information [Line Items]
Segment adjusted EBITDA	$ 12,875		$ 10,495		$ 24,775	$ 22,046