Valuation And Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2011
Allowance For Doubtful Accounts And Notes Receivable [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 2,992	$ 3,366	$ 3,210
Additions Charged to Costs and Expenses	(367)	764	1,462
Amounts Written Off Against the Allowance	(278)	(1,152)	(1,337)
(Transfer) Recoveries		14	31
Balance at End of Year	2,347	2,992	3,366
Accrued Carrying Costs For Drive-In Closings And Disposals [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	568	421	47
Additions Charged to Costs and Expenses	809	366	575
Amounts Written Off Against the Allowance	(249)	(219)	(150)
(Transfer) Recoveries	(29)		(51)
Balance at End of Year	$ 1,099	$ 568	$ 421