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Accounts And Notes Receivable (Summary Of Activity In Allowance For Doubtful Accounts) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011
Accounts And Notes Receivable [Abstract]
Balance at beginning of year	$ 748	$ 54
Additions to provision	520	694
Reductions for charge-offs	(190)
Balance at end of year	$ 1,078	$ 748

The sum of the periodic provision charged to earnings, based on an assessment of uncollectibility from the counterparty on account of loan, lease or other credit losses, to reduce these accounts to the amount that approximates their net realizable value.

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