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Summary of Significant Accounting Policies - (Concentration Risk) (Details)	12 Months Ended
	Dec. 30, 2020	Dec. 25, 2019	Dec. 26, 2018
Revenue from franchises and licenses risk
Concentration Risk
Franchise revenue, percentage	39.00%	35.00%	30.00%

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- Definition

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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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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