Sales Of Accounts Receivable (Narrative) (Details) (USD $)	12 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2011
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Proceed from sales of receivables	$ 1,000,000,000	$ 1,900,000,000	$ 1,300,000,000
Cash payment to owners of receivables	1,100,000,000	1,900,000,000	1,200,000,000
Discount on domestic and international sales of accounts receivables	3,900,000	6,400,000	5,100,000
Domestic Sale Of Accounts Receivable [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	358,800,000	406,900,000
Advance payment received on sale of account receivable	0	10,000,000
Outstanding deferred purchase price of receivables sold	358,800,000	396,900,000
International [Member]
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]
Accounts receivable sold	$ 24,500,000	$ 95,100,000