Revenue from Contracts with Customers - Additional Information (Details)	6 Months Ended
	Jun. 24, 2020 USD ($) item	Dec. 25, 2019 USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Number of revenue streams | item	2
Loyalty Rewards Program, Points Needed For One Reward	$ 100
Loyalty Rewards Program, Award Earned	$ 10
Loyalty Rewards Program, Expiration Period For Inactivity	1 year
Loyalty Reward Program, unused reward expiration period	6 months
Points transferred to reward amount, revenue	$ 10,000
Accrued Loyalty Rewards Program Liability, Current	$ 1,100,000	$ 1,100,000
Loyalty Rewards Program, Expected Loyalty Points Redemption Period	1 year
Unsatisfied performance obligations	$ 5,773,000
Franchise Rights [Member]
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 [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Unsatisfied performance obligations	$ 0
Minimum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with Customer, Liability, Revenue Recognized, Period	10 years
Maximum
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Contract with Customer, Liability, Revenue Recognized, Period	20 years