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Commitments and Contingencies - Narrative (Details) (USD $) | 12 Months Ended
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Aug. 31, 2013 | Aug. 31, 2012 | Aug. 31, 2011
Property, Plant and Equipment [Line Items] |  |  |
Loss Contingency, Range of Possible Loss, Minimum | $ 14,400,000 |  |
Loss Contingency, Range of Possible Loss, Maximum | 39,700,000 |  |
Loss Contingency, Loss in Period | 25,000,000 |  |
Grain Storage [Abstract] |  |  |
Inventory, held for third parties | 454,900,000 | 441,300,000 |
Guarantor Obligations, Maximum Exposure, Undiscounted | 1,000,000,000 |  |
Guarantees [Abstract] |  |  |
Guarantor obligations, current carrying value | 39,800,000 |  |
Lease Commitments |  |  |
Number of rail cars under operating lease commitments | 2,600 |  |
Operating leases, rent expense, net | 81,500,000 | 74,600,000 | 66,200,000
Unrecorded unconditional purchase obligation | $ 5,382,472,000 | $ 6,300,000,000 |
Minimum |  |  |
Lease Commitments |  |  |
Operating lease terms | 1 year |  |
Maximum |  |  |
Lease Commitments |  |  |
Operating lease terms | 13 years |  |

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- Definition The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 45 -Paragraph 13 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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