Sales Of Accounts Receivable (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2013 Domestic Sale Of Accounts Receivable [Member] entities	Aug. 31, 2012 Domestic Sale Of Accounts Receivable [Member]	Feb. 28, 2013 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
Sale of receivables maximum facility					$ 200,000,000
Accounts receivable sold					407,000,000	406,900,000	52,800,000	95,100,000
Advance payment received on sale of account receivable					15,000,000	10,000,000
Deferred purchase prices of sales of accounts receivable					392,000,000	396,900,000
Proceeds from sale and collection of receivables			603,000,000	988,700,000
Payments to acquire receivables			640,300,000	884,200,000
Discounts on sales of accounts receivable	$ 903,000	$ 1,798,000	$ 2,112,000	$ 3,458,000