Revenue Recognition - Performance Obligations (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 29, 2018	Dec. 19, 2018
Revenue from Contract with Customer [Abstract]
Revenue, performance obligation, amount		$ 1,462
Total operating franchise restaurants		617
Franchise restaurants not yet opened		845
Franchise agreement term	20 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-12-20
Revenue from Contract with Customer [Abstract]
Revenue, performance obligation, amount		$ 29
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, performance obligation, period		9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-08-29
Revenue from Contract with Customer [Abstract]
Revenue, performance obligation, amount		$ 41
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		$ 41
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		$ 41
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		$ 424
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, performance obligation, period		1 year