Revenue Recognition - Performance Obligations (Details) $ in Thousands	6 Months Ended
	Mar. 13, 2019 USD ($)
Revenue from Contract with Customer [Abstract]
Revenue, performance obligation, amount	$ 1,368
Total operating franchise restaurants	578
Franchise restaurants not yet opened	$ 790
Franchise agreement term	20 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-03-14
Revenue from Contract with Customer [Abstract]
Revenue, performance obligation, amount	$ 18
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, performance obligation, period	168 days
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-08-29
Revenue from Contract with Customer [Abstract]
Revenue, performance obligation, amount	$ 40
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, performance obligation, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-08-27
Revenue from Contract with Customer [Abstract]
Revenue, performance obligation, amount	$ 40
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, performance obligation, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-08-26
Revenue from Contract with Customer [Abstract]
Revenue, performance obligation, amount	$ 40
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, performance obligation, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-09-01
Revenue from Contract with Customer [Abstract]
Revenue, performance obligation, amount	$ 39
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, performance obligation, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-08-31
Revenue from Contract with Customer [Abstract]
Revenue, performance obligation, amount	$ 401
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, performance obligation, period