Property and Equipment, Intangible Assets and Goodwill - Property and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 26, 2020	Aug. 29, 2019	Aug. 28, 2019
Property, Plant and Equipment [Line Items]
Balance	$ 241,773		$ 265,279
Less accumulated depreciation and amortization	(141,174)		(143,536)
Property and equipment, net	100,599		121,743
Intangible assets, net	15,343	$ 16,591	16,781
Goodwill	$ 195		514
Minimum
Property, Plant and Equipment [Line Items]
Intangible asset useful life (years)	15 years
Maximum
Property, Plant and Equipment [Line Items]
Intangible asset useful life (years)	21 years
Land
Property, Plant and Equipment [Line Items]
Balance	$ 42,572		45,845
Restaurant equipment and furnishings
Property, Plant and Equipment [Line Items]
Balance	$ 60,685		67,015
Restaurant equipment and furnishings | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives (years)	3 years
Restaurant equipment and furnishings | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives (years)	15 years
Buildings
Property, Plant and Equipment [Line Items]
Balance	$ 114,909		126,957
Buildings | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives (years)	20 years
Buildings | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives (years)	33 years
Leasehold and leasehold improvements
Property, Plant and Equipment [Line Items]
Balance	$ 20,429		22,098
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Balance	$ 3,178		$ 3,364
Office furniture and equipment | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful lives (years)	3 years
Office furniture and equipment | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful lives (years)	10 years