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Derivative Financial Instruments and Hedging Activities Derivatives (Details) (USD $)	3 Months Ended	6 Months Ended	3 Months Ended
	Feb. 28, 2014	Feb. 28, 2014	Feb. 28, 2015	Aug. 31, 2014	Nov. 30, 2013
Purchase and Sales Contracts [Line Items]
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Asset at Fair Value			$ 5,600,000
Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value					13,200,000
Derivative Asset, Fair Value, Amount Not Offset Against Collateral			481,590,000	560,530,000
Derivative Asset, Fair Value, Gross Asset			614,004,000	603,933,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet			132,414,000	43,403,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral			348,897,000	554,083,000
Derivative Liability, Fair Value, Gross Liability			482,590,000	599,990,000
Derivative Liability, Collateral, Right to Reclaim Cash, Offset			1,279,000	2,504,000
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet			132,414,000	43,403,000
Commodity and Freight Derivatives [Member]
Purchase and Sales Contracts [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral			464,367,000	554,981,000
Derivative Asset, Fair Value, Gross Asset			595,994,000	597,210,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet			131,627,000	42,229,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral			332,079,000	552,879,000
Derivative Liability, Fair Value, Gross Liability			464,985,000	597,612,000
Derivative Liability, Collateral, Right to Reclaim Cash, Offset			1,279,000	2,504,000
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet			131,627,000	42,229,000
Foreign Exchange Contract [Member]
Purchase and Sales Contracts [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral			4,833,000	1,349,000
Derivative Asset, Fair Value, Gross Asset			5,620,000	2,523,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet			787,000	1,174,000
Derivative Liability, Fair Value, Amount Not Offset Against Collateral			12,428,000	1,074,000
Derivative Liability, Fair Value, Gross Liability			13,215,000	2,248,000
Derivative Liability, Collateral, Right to Reclaim Cash, Offset			0	0
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet			787,000	1,174,000
Designated as Hedging Instrument [Member] \| Interest Rate Swap [Member]
Purchase and Sales Contracts [Line Items]
Derivative Asset, Fair Value, Amount Not Offset Against Collateral			12,390,000	4,200,000
Derivative Asset, Fair Value, Gross Asset			12,390,000	4,200,000
Derivative Asset, Fair Value, Gross Amount Not Offset on Balance Sheet			0	0
Derivative Liability, Fair Value, Amount Not Offset Against Collateral			4,296,000
Derivative Liability, Fair Value, Gross Liability			4,296,000
Derivative Liability, Collateral, Right to Reclaim Cash, Offset			0
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet			0
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			94,000	130,000
Derivative Liability, Fair Value, Gross Liability			94,000	130,000
Derivative Liability, Collateral, Right to Reclaim Cash, Offset			0	0
Derivative Liability, Fair Value, Gross Amount Not Offset on Balance Sheet			0	0
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] \| Reclassification out of Accumulated Other Comprehensive Income [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	13,500,000
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			8,200,000
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
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
Interest Rate Contracts, Expiring At Various Times Through Fiscal 2018 [Member] \| Not Designated as Hedging Instrument [Member]
Purchase and Sales Contracts [Line Items]
Derivative Asset, Notional Amount			3,900,000
Interest Rate Contracts, Expiring During Fiscal 2015 [Member] \| Not Designated as Hedging Instrument [Member]
Purchase and Sales Contracts [Line Items]
Derivative Asset, Notional Amount			100,000
Interest Rate Contracts, Expiring during Fiscal 2016 [Member] \| Designated as Hedging Instrument [Member]
Purchase and Sales Contracts [Line Items]
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net			$ 0