Accounts And Notes Receivable (Details) - USD ($) $ in Thousands	Feb. 28, 2018	Aug. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Royalties and other trade receivables	$ 15,591	$ 19,571
Current accounts and notes receivable, gross	33,031	34,847
Allowance for doubtful accounts and notes receivable	(958)	(1,089)
Current accounts and notes receivable, net	32,073	33,758
Allowance for doubtful notes receivable	(105)	(42)
Noncurrent notes receivable, net	14,128	9,801
Notes Receivable From Franchisees [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current accounts and notes receivable, gross	1,966	1,441
Noncurrent accounts and notes receivable, gross	8,541	6,810
Receivables From System Funds [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current accounts and notes receivable, gross	8,540	6,360
Noncurrent accounts and notes receivable, gross	5,692	3,033
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current accounts and notes receivable, gross	$ 6,934	$ 7,475