Acquisitions (Details) $ in Thousands	12 Months Ended
	Dec. 29, 2024 USD ($) restaurant	Dec. 31, 2023 USD ($) restaurant
Business Acquisition [Line Items]
Goodwill acquired		$ 5,376
Acquisition accounting adjustments	$ 95
International
Business Acquisition [Line Items]
Goodwill acquired		$ 4,274
Acquisition accounting adjustments	95
UK franchisee acquisitions
Business Acquisition [Line Items]
Number of stores acquired | restaurant		118
Acquisition and transition costs		$ 2,100
Total consideration		15,200
Noncash purchase consideration		13,700
Property and equipment, net acquired		10,600
Inventories and other assets acquired		300
Goodwill acquired		$ 4,300
Acquisition accounting adjustments	$ 100
Domestic restaurant acquisitions
Business Acquisition [Line Items]
Number of stores acquired | restaurant	1	10
Total consideration	$ 100	$ 4,100