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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 | 3 Months Ended
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Nov. 30, 2013 | Nov. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items] |  |
Pretax gain (loss) on derivative instruments | $ (20,212) | $ (329,978)
Commodity and Freight Derivatives [Member] | Cost of goods sold |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Pretax gain (loss) on derivative instruments | (19,789) | (328,284)
Foreign Exchange Contract [Member] | Cost of goods sold |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Pretax gain (loss) on derivative instruments | (422) | (1,685)
Interest rate derivatives | Interest, net |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Pretax gain (loss) on derivative instruments | $ (1) | $ (9)

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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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