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Significant Accounting Policies - Stock-Based Compensation, PP&E, and Deferred Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 27, 2020	Dec. 29, 2019	Dec. 30, 2018
Stock-Based Compensation
Vesting period	3 years
Property and Equipment
Depreciation expense	$ 46.6	$ 45.9	$ 45.6
Deferred Costs
Deferred costs, maximum amortization period	5 years
Deferred costs	$ 3.3	3.5	$ 4.3
Unamortized systems development costs	$ 10.5	$ 11.5
Restaurant, commissary and other equipment | Minimum
Property and Equipment
Estimated useful lives	5 years
Restaurant, commissary and other equipment | Maximum
Property and Equipment
Estimated useful lives	10 years
Buildings and improvements | Minimum
Property and Equipment
Estimated useful lives	20 years
Buildings and improvements | Maximum
Property and Equipment
Estimated useful lives	40 years
Technology and communication assets
Property and Equipment
Estimated useful lives	5 years
Leasehold improvements | Minimum
Property and Equipment
Estimated useful lives	5 years
Leasehold improvements | Maximum
Property and Equipment
Estimated useful lives	10 years

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