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Derivative Financial Instruments and Hedging Activities Derivatives (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
May 31, 2016 | Feb. 29, 2016 | Nov. 30, 2015 | May 31, 2016 | May 31, 2015 | Aug. 31, 2015
Purchase and Sales Contracts [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | $ 532,723,000 |  |  | $ 532,723,000 |  | $ 443,358,000
Derivative Asset, Fair Value, Gross Asset | 587,013,000 |  |  | 587,013,000 |  | 513,441,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet | 54,290,000 |  |  | 54,290,000 |  | 70,083,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 422,484,000 |  |  | 422,484,000 |  | 389,204,000
Derivative Liability, Fair Value, Gross Liability | 486,631,000 |  |  | 486,631,000 |  | 470,769,000
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 9,857,000 |  |  | 9,857,000 |  | 11,482,000
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet | 54,290,000 |  |  | 54,290,000 |  | 70,083,000
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net |  |  |  | 0 |  |
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |  |  |  |
Purchase and Sales Contracts [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 19,877,000 |  |  | 19,877,000 |  | 14,216,000
Derivative Asset, Fair Value, Gross Asset | 19,877,000 |  |  | 19,877,000 |  | 14,216,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet | 0 |  |  | 0 |  | 0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 0 |  |  | 0 |  | 6,058,000
Derivative Liability, Fair Value, Gross Liability | 0 |  |  | 0 |  | 6,058,000
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 |  |  | 0 |  | 0
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet | 0 |  |  | 0 |  | 0
Not Designated as Hedging Instrument [Member] | Commodity and Freight Derivatives [Member] |  |  |  |  |  |
Purchase and Sales Contracts [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 505,430,000 |  |  | 505,430,000 |  | 417,670,000
Derivative Asset, Fair Value, Gross Asset | 553,048,000 |  |  | 553,048,000 |  | 476,071,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet | 47,618,000 |  |  | 47,618,000 |  | 58,401,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 414,865,000 |  |  | 414,865,000 |  | 357,169,000
Derivative Liability, Fair Value, Gross Liability | 472,340,000 |  |  | 472,340,000 |  | 427,052,000
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 9,857,000 |  |  | 9,857,000 |  | 11,482,000
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet | 47,618,000 |  |  | 47,618,000 |  | 58,401,000
Not Designated as Hedging Instrument [Member] | Foreign Exchange Contract [Member] |  |  |  |  |  |
Purchase and Sales Contracts [Line Items] |  |  |  |  |  |
Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 7,416,000 |  |  | 7,416,000 |  | 11,472,000
Derivative Asset, Fair Value, Gross Asset | 14,088,000 |  |  | 14,088,000 |  | 23,154,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet | 6,672,000 |  |  | 6,672,000 |  | 11,682,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 7,604,000 |  |  | 7,604,000 |  | 25,916,000
Derivative Liability, Fair Value, Gross Liability | 14,276,000 |  |  | 14,276,000 |  | 37,598,000
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 |  |  | 0 |  | 0
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet | 6,672,000 |  |  | 6,672,000 |  | 11,682,000
Not Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] |  |  |  |  |  |
Purchase and Sales Contracts [Line Items] |  |  |  |  |  |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 15,000 |  |  | 15,000 |  | 61,000
Derivative Liability, Fair Value, Gross Liability | 15,000 |  |  | 15,000 |  | 61,000
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 0 |  |  | 0 |  | 0
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet | 0 |  |  | 0 |  | 0
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |  |
Purchase and Sales Contracts [Line Items] |  |  |  |  |  |
Derivative Asset, Notional Amount | 820,200,000 |  |  | 820,200,000 |  | 1,300,000,000
Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |
Purchase and Sales Contracts [Line Items] |  |  |  |  |  |
Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge |  |  |  | 7,600,000 | $ 8,300,000 |
Fair Value Hedging [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |
Purchase and Sales Contracts [Line Items] |  |  |  |  |  |
Derivative Asset, Notional Amount | 420,000,000 |  |  | $ 420,000,000 |  |
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |  |
Purchase and Sales Contracts [Line Items] |  |  |  |  |  |
Derivative Asset, Notional Amount |  |  |  |  |  | $ 300,000,000
Cash paid to settle derivative | $ 5,100,000 | $ 5,300,000 | $ 6,400,000 |  |  |
Derivatives settled, number | 2 | 2 | 2 |  |  |

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