Revenue from Contracts with Customers - Additional Information (Details)	12 Months Ended
	Dec. 30, 2020 USD ($) restaurant item	Dec. 25, 2019 USD ($) restaurant	Dec. 25, 2019 USD ($)	Dec. 25, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Number of revenue streams | item	2
Accrued Loyalty Rewards Program Liability, Current	$ 900,000		$ 1,100,000
Loyalty Rewards Program, Expected Loyalty Points Redemption Period	1 year
Franchise Rights
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Finite-Lived Intangible Asset, Useful Life	20 years
Finite-Lived Intangible Asset, Useful Life Renewal Period	20 years
Hardware Services
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Unsatisfied performance obligations	$ 0
California
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Number of Restaurants	4	1		4
Restaurant Sale | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Additional contract liability		$ 700,000
Restaurant Sale | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | California
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Number of Restaurants | restaurant		4
Restaurant Sale | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | ARIZONA
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Number of Restaurants				7