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Related Party Transactions (Narrative) (Details) (USD $)	12 Months Ended
	Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Related Party Transaction [Line Items]
Proceeds from the sale of equity method investments	$ 0	$ 10,802,000	$ 0
Sales	0	135,300,000	329,400,000
Purchases	0	150,900,000	352,800,000
Key Supplier [Member]
Related Party Transaction [Line Items]
Percentage of interest owned		11.00%
Corporate Joint Venture [Member]
Related Party Transaction [Line Items]
Percentage of interest owned		50.00%
Number Of Entities Owned		2
Proceeds from the sale of equity method investments		$ 8,300,000

The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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- Definition

Amount of revenue, fees and commissions earned from transactions between (a) a parent company and its subsidiaries; (b) subsidiaries of a common parent; (c) an entity and trusts for the benefit of employees, for example, but not limited to, pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management; (d) an entity and its principal, owners, management, or members of their immediate families; and (e) affiliates.

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