Valuation And Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Allowance For Doubtful Accounts And Notes Receivable [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 3,366	$ 3,210	$ 879
Additions Charged to Costs and Expenses	764	1,462	2,460
Amounts Written Off Against the Allowance	(1,152)	(1,337)	(139)
(Transfer) Recoveries	14	31	10
Balance at End of Year	2,992	3,366	3,210
Accrued Carrying Costs For Drive-In Closings And Disposals [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	421	47	46
Additions Charged to Costs and Expenses	366	575
Amounts Written Off Against the Allowance	(219)	(150)
(Transfer) Recoveries		(51)	1
Balance at End of Year	$ 568	$ 421	$ 47