Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014
Allowance For Doubtful Accounts And Notes Receivable [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 1,105	$ 1,771	$ 2,347
Additions Charged to Costs and Expenses	(53)	(81)	(434)
Amounts Written Off Against the Allowance	(13)	(601)	(142)
(Transfer) Recoveries	2	16
Balance at End of Year	1,041	1,105	1,771
Accrued Carrying Costs For Drive-In Closings And Disposals [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	807	871	1,099
Additions Charged to Costs and Expenses	208	367	339
Amounts Written Off Against the Allowance	(376)	(422)	(546)
(Transfer) Recoveries	(28)	(9)	(21)
Balance at End of Year	$ 611	$ 807	$ 871