Sales Of Accounts Receivable (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2013	May 31, 2012	May 31, 2013 Domestic Sale Of Accounts Receivable [Member] entities	Aug. 31, 2012 Domestic Sale Of Accounts Receivable [Member]	May 31, 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					408,200,000	406,900,000	67,800,000	95,100,000
Advance payment received on sale of account receivable					35,000,000	10,000,000
Deferred purchase prices of sales of accounts receivable					373,200,000	396,900,000
Proceeds from sale and collection of receivables			828,600,000	1,500,000,000
Payments to acquire receivables			830,900,000	1,500,000,000
Discounts on sales of accounts receivable	$ 1,010,000	$ 1,611,000	$ 3,122,000	$ 5,069,000