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Accounts And Notes Receivable (Details) - USD ($)
$ in Thousands
Feb. 28, 2017
Aug. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Royalties and other trade receivables $ 15,749 $ 19,994
Current accounts and notes receivable, gross 29,165 36,404
Allowance for doubtful accounts and notes receivable (1,101) (967)
Current accounts and notes receivable, net 28,064 35,437
Allowance for doubtful notes receivable (53) (74)
Noncurrent notes receivable, net 10,236 12,562
Notes Receivable From Franchisees [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current accounts and notes receivable, gross 2,717 5,531
Noncurrent accounts and notes receivable, gross 6,984 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 3,305 5,466
Other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Current accounts and notes receivable, gross $ 8,241 $ 6,507