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Derivative Financial Instruments and Hedging Activities Derivatives (Details) (USD $) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9 Months Ended |
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May 31, 2014 | Aug. 31, 2013 | May 31, 2013 | May 31, 2014 Commodity and Freight Derivatives [Member] | Aug. 31, 2013 Commodity and Freight Derivatives [Member] | May 31, 2013 Commodity and Freight Derivatives [Member] | May 31, 2014 Foreign Exchange Contract [Member] | Aug. 31, 2013 Foreign Exchange Contract [Member] | May 31, 2013 Foreign Exchange Contract [Member] | May 31, 2014 Designated as Hedging Instrument [Member] Interest Rate Swap [Member] | Aug. 31, 2013 Designated as Hedging Instrument [Member] Interest Rate Swap [Member] | May 31, 2013 Designated as Hedging Instrument [Member] Interest Rate Swap [Member] | May 31, 2014 Not Designated as Hedging Instrument [Member] Interest Rate Swap [Member] | Aug. 31, 2013 Not Designated as Hedging Instrument [Member] Interest Rate Swap [Member] | May 31, 2013 Not Designated as Hedging Instrument [Member] Interest Rate Swap [Member] | May 31, 2014 Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] Reclassification out of Accumulated Other Comprehensive Income [Member] | May 31, 2014 Fair Value Hedging [Member] Interest Rate Swap [Member]
Purchase and Sales Contracts [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,500,000 |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 492,202,000 | 445,823,000 | 491,783,000 | 492,095,000 | 415,566,000 | 477,580,000 | 105,000 | 6,122,000 | 5,043,000 | 2,000 | 24,135,000 | 9,160,000 |  | 0 |  |  |
Derivative Asset, Fair Value, Gross Asset | 544,382,000 | 499,890,000 | 524,461,000 | 544,198,000 | 468,673,000 | 510,258,000 | 182,000 | 7,079,000 | 5,043,000 | 2,000 | 24,135,000 | 9,160,000 |  | 3,000 |  |  |
Derivative Asset, Collateral, Obligation to Return Cash, Offset | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |  | 0 |  |  |
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet | 52,180,000 | 54,067,000 | 32,678,000 | 52,103,000 | 53,107,000 | 32,678,000 | 77,000 | 957,000 | 0 | 0 | 0 | 0 |  | 3,000 |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 360,291,000 | 409,408,000 | 367,375,000 | 358,045,000 | 404,195,000 | 363,188,000 | 2,076,000 | 4,968,000 | 3,883,000 |  |  |  | 170,000 | 245,000 | 304,000 |  |
Derivative Liability, Fair Value, Gross Liability | 412,471,000 | 465,066,000 | 456,476,000 | 410,148,000 | 458,893,000 | 452,289,000 | 2,153,000 | 5,925,000 | 3,883,000 |  |  |  | 170,000 | 248,000 | 304,000 |  |
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 | 1,591,000 | 56,423,000 | 0 | 1,591,000 | 56,423,000 | 0 | 0 | 0 |  |  |  | 0 | 0 | 0 |  |
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet | 52,180,000 | 54,067,000 | 32,678,000 | 52,103,000 | 53,107,000 | 32,678,000 | 77,000 | 957,000 | 0 |  |  |  | 0 | 3,000 | 0 |  |
Derivative Asset, Notional Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 130,000,000

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- Definition Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against a right to receive collateral under a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226011-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226006-175313 + Details
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- Definition The amount of gain reclassified into earnings in the period when cash flow hedge is discontinued because it is probable that the original forecasted transactions will not occur by the end of the original period or an additional two month time period. + 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 (e) -URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80748-113994 + Details
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