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Derivative Financial Instruments and Hedging Activities - Gross Fair Values of Derivative Assets, Derivative Liabilities, and Margin Deposits (Cash Collateral) (Details) - USD ($)
$ in Thousands
Aug. 31, 2018
Aug. 31, 2017
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Gross Amounts Recognized $ 352,029 $ 249,661
Derivative asset, fair value, gross amount not offset on Balance sheet 35,484 38,548
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 316,545 211,113
Derivative Liability, Fair Value, Gross Liability 445,755 313,261
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 12,983 3,898
Derivative liability, fair value, gross amount not offset on balance sheet 35,484 38,548
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 397,288 270,815
Not Designated as Hedging Instrument | Commodity derivatives    
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Gross Amounts Recognized 313,033 215,349
Derivative asset, fair value, gross amount not offset on Balance sheet 26,781 34,912
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 286,252 180,437
Derivative Liability, Fair Value, Gross Liability 421,054 293,330
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 12,983 3,898
Derivative liability, fair value, gross amount not offset on balance sheet 26,781 34,912
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 381,290 254,520
Not Designated as Hedging Instrument | Foreign exchange derivatives    
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Gross Amounts Recognized 15,401 8,779
Derivative asset, fair value, gross amount not offset on Balance sheet 8,703 3,636
Derivative Asset, Fair Value, Amount Not Offset Against Collateral 6,698 5,143
Derivative Liability, Fair Value, Gross Liability 24,701 19,931
Derivative Liability, Collateral, Right to Reclaim Cash, Offset 0 0
Derivative liability, fair value, gross amount not offset on balance sheet 8,703 3,636
Derivative Liability, Fair Value, Amount Not Offset Against Collateral 15,998 16,295
Not Designated as Hedging Instrument | Embedded derivative asset    
Reconciliation of gross and net fair value of assets and liabilities subject to offsetting arrangements [Line Items]    
Gross Amounts Recognized 23,595 25,533
Derivative asset, fair value, gross amount not offset on Balance sheet 0 0
Derivative Asset, Fair Value, Amount Not Offset Against Collateral $ 23,595 $ 25,533