Revenue Recognition - Contract Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 26, 2020	Aug. 28, 2019
Gift Cards, net of discounts
Revenue From Contract With Customer, Contract Liability [Roll Forward]
Contract liability, beginning of period	$ 2,880	$ 2,707
Revenue recognized that was included in the contract liability balance at the beginning of the year	(1,011)	(1,308)
Increase (decrease), net of amounts recognized as revenue during the period	1,541	1,481
Contract liability, end of period	3,410	2,880
Franchise Fees
Revenue From Contract With Customer, Contract Liability [Roll Forward]
Contract liability, beginning of period	1,287	1,891
Revenue recognized that was included in the contract liability balance at the beginning of the year	(128)	(564)
Increase (decrease), net of amounts recognized as revenue during the period	0	(40)
Contract liability, end of period	$ 1,159	$ 1,287