Sales Of Accounts Receivable (Narrative) (Details) (USD $)	3 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2012 Domestic Sale Of Accounts Receivable [Member] entities	Aug. 31, 2012 Domestic Sale Of Accounts Receivable [Member]	Nov. 30, 2012 International [Member]	Aug. 31, 2012 International [Member]
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Number of financial institutions			2
Maximum advance limit for receivables sold			$ 200,000,000
Accounts receivable sold			405,000,000	406,900,000	58,500,000	95,100,000
Advance payment received on sale of account receivable			0	10,000,000
Outstanding deferred purchase price of receivables sold			405,000,000	396,900,000
Proceed from sales of receivables	287,000,000	528,900,000
Cash payment to owners of receivables	333,600,000	481,100,000
Discount on domestic and international sales of accounts receivables	$ 1,209,000	$ 1,660,000