Revenue from Contracts with Customers - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 26, 2026	Sep. 27, 2025	Sep. 26, 2026	Sep. 27, 2025
Disaggregation of Revenue [Line Items]
Total revenue	$ 185,131	$ 175,736	$ 554,420	$ 521,159
Royalty revenue, franchise fees and other
Disaggregation of Revenue [Line Items]
Total revenue	86,301	81,187	260,615	239,851
Royalty revenue
Disaggregation of Revenue [Line Items]
Total revenue	78,282	73,908	233,653	218,760
Franchise fees and other
Disaggregation of Revenue [Line Items]
Total revenue	8,019	7,279	26,962	21,091
Advertising fees
Disaggregation of Revenue [Line Items]
Total revenue	64,050	62,018	191,855	186,252
Company-owned restaurant sales
Disaggregation of Revenue [Line Items]
Total revenue	$ 34,780	$ 32,531	$ 101,950	$ 95,056

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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