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Summary of Significant Accounting Policies - Derivative Assets and Liabilities Not Designated As Hedging Instruments (Details) (Not Designated as Hedging Instrument, USD $) In Thousands, unless otherwise specified | Nov. 30, 2012 | Aug. 31, 2012 | Nov. 30, 2011
--- | --- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Derivative Assets | $ 635,684 | $ 1,071,778 | $ 641,905
Derivative Liabilities | 525,094 | 730,878 | 541,021
Commodity and freight derivatives |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Assets | 632,544 | 1,070,800 | 641,890
Derivative Liabilities | 518,377 | 727,946 | 540,426
Foreign exchange derivatives |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Assets | 3,140 | 978 | 15
Derivative Liabilities | 6,234 | 2,388 |
Interest rate derivatives |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivative Liabilities | $ 483 | $ 544 | $ 595

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