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Summary of Significant Accounting Policies - Pretax Gains (Losses) On Derivatives Not Accounted For As Hedging Instruments (Details) (Not Designated as Hedging Instrument, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	Aug. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]
Pretax gain (loss) on derivative instruments	$ (482,504)	$ 306,154
Commodity and freight derivatives | Cost of goods sold
Derivative Instruments, Gain (Loss) [Line Items]
Pretax gain (loss) on derivative instruments	(482,352)	311,167	186,265
Foreign exchange derivatives | Cost of goods sold
Derivative Instruments, Gain (Loss) [Line Items]
Pretax gain (loss) on derivative instruments	(452)	(5,219)	3,363
Interest rate derivatives | Interest, net
Derivative Instruments, Gain (Loss) [Line Items]
Pretax gain (loss) on derivative instruments	$ 300	$ 206	$ 522

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- Definition

Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4A

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959

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