Fair Value Measurements Recurring Fair Value Measurements by Level (Details) (USD $) In Thousands, unless otherwise specified	Nov. 30, 2013	Aug. 31, 2013	Nov. 30, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 390,084	$ 499,890	$ 635,684
Derivative Liability, Fair Value, Gross Liability	407,238	465,066	525,094
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Inventory, Current, Fair Value Disclosure
Other Assets, Fair Value Disclosure	112,521	114,084	75,873
Assets, Fair Value Disclosure	156,655	179,419	167,271
Contingent Liability, Fair Value DIsclosure
Liabilities, Fair Value Disclosure	70,006	65,109	64,544
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Inventory, Current, Fair Value Disclosure	1,222,328	1,203,383	2,186,328
Other Assets, Fair Value Disclosure
Assets, Fair Value Disclosure	1,568,278	1,637,940	2,730,614
Contingent Liability, Fair Value DIsclosure
Liabilities, Fair Value Disclosure	337,232	399,958	460,550
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Inventory, Current, Fair Value Disclosure
Other Assets, Fair Value Disclosure
Assets, Fair Value Disclosure
Contingent Liability, Fair Value DIsclosure	150,991	134,134	170,621
Liabilities, Fair Value Disclosure	150,991	134,134	170,621
Fair Value, Measurements, Recurring | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Inventory, Current, Fair Value Disclosure	1,222,328	1,203,383	2,186,328
Other Assets, Fair Value Disclosure	112,521	114,084	75,873
Assets, Fair Value Disclosure	1,724,933	1,817,359	2,897,885
Contingent Liability, Fair Value DIsclosure	150,991	134,134	170,621
Liabilities, Fair Value Disclosure	558,229	599,201	695,715
Commodity and Freight Derivatives [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value, Gross Asset	364,454	468,673	632,544
Derivative Liability, Fair Value, Gross Liability	405,346	458,893	518,377
Commodity and Freight Derivatives [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value, Gross Asset	39,948	58,441	88,258
Derivative Liability, Fair Value, Gross Liability	68,362	59,184	58,310
Commodity and Freight Derivatives [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value, Gross Asset	324,506	410,233	544,286
Derivative Liability, Fair Value, Gross Liability	336,984	399,710	460,067
Commodity and Freight Derivatives [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value, Gross Asset
Derivative Liability, Fair Value, Gross Liability
Commodity and Freight Derivatives [Member] | Fair Value, Measurements, Recurring | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value, Gross Asset	364,454	468,674	632,544
Derivative Liability, Fair Value, Gross Liability	405,346	458,894	518,377
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value, Gross Asset
Derivative Liability, Fair Value, Gross Liability
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value, Gross Asset	18,854	24,139
Derivative Liability, Fair Value, Gross Liability	245	248	483
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value, Gross Asset
Derivative Liability, Fair Value, Gross Liability
Interest Rate Swap [Member] | Fair Value, Measurements, Recurring | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value, Gross Asset	18,854	24,139
Derivative Liability, Fair Value, Gross Liability	245	248	483
Foreign Exchange Contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value, Gross Asset	6,776	7,079	3,140
Derivative Liability, Fair Value, Gross Liability	1,647	5,925	6,234
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value, Gross Asset	4,186	6,894	3,140
Derivative Liability, Fair Value, Gross Liability	1,644	5,925	6,234
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value, Gross Asset	2,590	185
Derivative Liability, Fair Value, Gross Liability	3
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value, Gross Asset
Derivative Liability, Fair Value, Gross Liability
Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring | Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Asset, Fair Value, Gross Asset	6,776	7,079	3,140
Derivative Liability, Fair Value, Gross Liability	$ 1,647	$ 5,925	$ 6,234