Revenue Recognition - Performance Obligations (Details) $ in Thousands	12 Months Ended
	Aug. 26, 2020 USD ($)
Revenue from Contract with Customer [Abstract]
Revenue, performance obligation, amount	$ 1,159
Total operating franchise restaurants	404
Franchise restaurants not yet opened	$ 755
Franchise term	20 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-08-27
Revenue from Contract with Customer [Abstract]
Revenue, performance obligation, amount	$ 32
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]: 2021-08-25
Revenue from Contract with Customer [Abstract]
Revenue, performance obligation, amount	$ 32
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]: 2022-08-31
Revenue from Contract with Customer [Abstract]
Revenue, performance obligation, amount	$ 32
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]: 2023-08-30
Revenue from Contract with Customer [Abstract]
Revenue, performance obligation, amount	$ 32
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]: 2024-08-28
Revenue from Contract with Customer [Abstract]
Revenue, performance obligation, amount	$ 32
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]: 2025-08-27
Revenue from Contract with Customer [Abstract]
Revenue, performance obligation, amount	$ 244
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, performance obligation, period