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Summary of Significant Accounting Policies Derivatives (Details) (USD $) | 3 Months Ended |  |
--- | --- | --- | ---
Nov. 30, 2013 | Aug. 31, 2013 | Nov. 30, 2012
Purchase and Sales Contracts [Line Items] |  |  |
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | $ 1,200,000 |  |
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet | 42,186,000 | 54,067,000 | 46,579,000
Derivative Liability, Fair Value, Net | 357,678,000 | 409,408,000 | 468,428,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet | 42,186,000 | 54,067,000 | 46,579,000
Derivative Asset, Fair Value, Net | 347,630,000 | 445,823,000 | 589,105,000
Derivative Asset, Fair Value, Gross Asset | 390,084,000 | 499,890,000 | 635,684,000
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 268,000 |  |
Derivative Liability, Fair Value, Gross Liability | 407,238,000 | 465,066,000 | 525,094,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 7,374,000 | 1,591,000 | 10,087,000
Commodity and Freight Derivatives [Member] |  |  |
Purchase and Sales Contracts [Line Items] |  |  |
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet | 41,126,000 | 53,107,000 | 46,578,000
Derivative Liability, Fair Value, Net | 356,846,000 | 404,195,000 | 461,712,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet | 41,126,000 | 53,107,000 | 46,578,000
Derivative Asset, Fair Value, Net | 323,060,000 | 415,566,000 | 585,966,000
Derivative Asset, Fair Value, Gross Asset | 364,454,000 | 468,673,000 | 632,544,000
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 268,000 |  |
Derivative Liability, Fair Value, Gross Liability | 405,346,000 | 458,893,000 | 518,377,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 7,374,000 | 1,591,000 | 10,087,000
Foreign Exchange Contract [Member] |  |  |
Purchase and Sales Contracts [Line Items] |  |  |
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet | 1,060,000 | 957,000 | 1,000
Derivative Liability, Fair Value, Net | 587,000 | 4,968,000 | 6,233,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet | 1,060,000 | 957,000 | 1,000
Derivative Asset, Fair Value, Net | 5,716,000 | 6,122,000 | 3,139,000
Derivative Asset, Fair Value, Gross Asset | 6,776,000 | 7,079,000 | 3,140,000
Derivative Asset, Fair Value, Amount Not Offset Against Collateral |  |  |
Derivative Liability, Fair Value, Gross Liability | 1,647,000 | 5,925,000 | 6,234,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  |  |
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |
Purchase and Sales Contracts [Line Items] |  |  |
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet |  |  |
Derivative Asset, Fair Value, Net | 18,854,000 | 24,135,000 |
Derivative Asset, Fair Value, Gross Asset | 18,854,000 | 24,135,000 |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral |  |  |
Not Designated as Hedging Instrument | Interest Rate Swap [Member] |  |  |
Purchase and Sales Contracts [Line Items] |  |  |
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet |  | 3,000 |
Derivative Liability, Fair Value, Net | 245,000 | 245,000 | 483,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet |  | 3,000 |
Derivative Asset, Fair Value, Net |  |  |
Derivative Asset, Fair Value, Gross Asset |  | 3,000 |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral |  |  |
Derivative Liability, Fair Value, Gross Liability | 245,000 | 248,000 | 483,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral |  |  |

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 45 -Subparagraph b(2) -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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