Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2013
Allowance For Doubtful Accounts And Notes Receivable [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 1,771	$ 2,347	$ 2,992
Additions Charged to Costs and Expenses	(81)	(434)	(367)
Amounts Written Off Against the Allowance	(601)	(142)	(278)
(Transfer) Recoveries	16
Balance at End of Year	1,105	1,771	2,347
Accrued Carrying Costs For Drive-In Closings And Disposals [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	871	1,099	568
Additions Charged to Costs and Expenses	367	339	809
Amounts Written Off Against the Allowance	(422)	(546)	(249)
(Transfer) Recoveries	(9)	(21)	(29)
Balance at End of Year	$ 807	$ 871	$ 1,099