Revenues Deferred Revenue (Details) $ in Thousands	Dec. 26, 2018 USD ($)
Revenue from Contract with Customer [Abstract]
Deferred franchise revenue expencted to be recognized	$ 20,538
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-12-27
Revenue from Contract with Customer [Abstract]
Deferred franchise revenue expencted to be recognized	2,124
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-12-26
Revenue from Contract with Customer [Abstract]
Deferred franchise revenue expencted to be recognized	1,977
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-12-31
Revenue from Contract with Customer [Abstract]
Deferred franchise revenue expencted to be recognized	1,796
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-12-30
Revenue from Contract with Customer [Abstract]
Deferred franchise revenue expencted to be recognized	1,687
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-12-29
Revenue from Contract with Customer [Abstract]
Deferred franchise revenue expencted to be recognized	1,608
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-12-28
Revenue from Contract with Customer [Abstract]
Deferred franchise revenue expencted to be recognized	$ 11,346