Accounts And Notes Receivable (Details) - USD ($) $ in Thousands	May 31, 2017	Aug. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Royalties and other trade receivables	$ 21,301	$ 19,994
Current accounts and notes receivable, gross	41,456	36,404
Allowance for doubtful accounts and notes receivable	(1,095)	(967)
Current accounts and notes receivable, net	40,361	35,437
Allowance for doubtful notes receivable	(40)	(74)
Noncurrent notes receivable, net	10,077	12,562
Notes Receivable From Franchisees [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current accounts and notes receivable, gross	985	5,531
Noncurrent accounts and notes receivable, gross	6,884	7,170
Receivables From System Funds [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current accounts and notes receivable, gross	2,458	4,372
Noncurrent accounts and notes receivable, gross	3,233	5,466
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current accounts and notes receivable, gross	$ 16,712	$ 6,507