Revenues Estimated Revenue Recognition (Details) $ in Thousands	Sep. 26, 2018 USD ($)
Revenue, Performance Obligation [Abstract]
Deferred franchise revenue expected to be recognized	$ 20,786
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-09-27
Revenue, Performance Obligation [Abstract]
Deferred franchise revenue expected to be recognized	$ 546
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	3 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-12-27
Revenue, Performance Obligation [Abstract]
Deferred franchise revenue expected to be recognized	$ 2,114
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-12-26
Revenue, Performance Obligation [Abstract]
Deferred franchise revenue expected to be recognized	$ 1,967
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-12-31
Revenue, Performance Obligation [Abstract]
Deferred franchise revenue expected to be recognized	$ 1,783
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-12-30
Revenue, Performance Obligation [Abstract]
Deferred franchise revenue expected to be recognized	$ 1,675
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-12-29
Revenue, Performance Obligation [Abstract]
Deferred franchise revenue expected to be recognized	$ 12,701
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period