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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
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Aug. 31, 2012 | Aug. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items] |  |
Pretax gain (loss) on derivative instruments | $ 306,154 | $ 190,150
Commodity and freight derivatives | Cost of goods sold |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Pretax gain (loss) on derivative instruments | 311,167 | 186,265
Foreign exchange derivatives | Cost of goods sold |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Pretax gain (loss) on derivative instruments | (5,219) | 3,363
Interest rate derivatives | Interest, net |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Pretax gain (loss) on derivative instruments | $ 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 + Details
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