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Fair Value Measurements Recurring Fair Value Measurements by Level (Details) (USD $)
In Thousands, unless otherwise specified

6 Months Ended

Feb. 28, 2014

Aug. 31, 2013

Feb. 28, 2013

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Derivative Asset, Fair Value, Gross Asset

$ 621,523

$ 499,890

$ 501,178

Derivative Liability, Fair Value, Gross Liability

553,693

465,066

429,975

Fair Value Measurements, Recurring and Nonrecurring

	February 28, 2014
	Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)				Total
	(Dollars in thousands)
Assets:
Readily marketable inventories					$	1,318,428							$	1,318,428
Commodity and freight derivatives	$	57,638			557,540								615,178
Foreign currency derivatives	6,345												6,345
Other assets	114,261												114,261
Total Assets	$	178,244			$	1,875,968							$	2,054,212
Liabilities:
Commodity and freight derivatives	$	90,989			$	459,881							$	550,870
Interest rate swap derivatives					194								194
Foreign currency derivatives	2,629												2,629
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interests									$	140,631			140,631
Total Liabilities	$	93,618			$	460,075			$	140,631			$	694,324

	August 31, 2013
	Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)				Total
	(Dollars in thousands)
Assets:
Readily marketable inventories					$	1,203,383							$	1,203,383
Commodity and freight derivatives	$	58,441			410,233								468,674
Interest rate swap derivatives					24,139								24,139
Foreign currency derivatives	6,894				185								7,079
Other assets	114,084												114,084
Total Assets	$	179,419			$	1,637,940							$	1,817,359
Liabilities:
Commodity and freight derivatives	$	59,184			$	399,710							$	458,894
Interest rate swap derivatives					248								248
Foreign currency derivatives	5,925												5,925
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interests									$	134,134			134,134
Total Liabilities	$	65,109			$	399,958			$	134,134			$	599,201

	February 28, 2013
	Quoted Prices in Active Markets for Identical Assets (Level 1)				Significant Other Observable Inputs (Level 2)				Significant Unobservable Inputs (Level 3)				Total
	(Dollars in thousands)
Assets:
Readily marketable inventories					$	1,697,214							$	1,697,214
Commodity and freight derivatives	$	38,327			446,895								485,222
Interest rate swap derivatives					459								459
Foreign currency derivatives	15,497												15,497
Other assets	79,333												79,333
Total Assets	$	133,157			$	2,144,568							$	2,277,725
Liabilities:
Commodity and freight derivatives	$	21,084			$	407,782							$	428,866
Interest rate swap derivatives					418								418
Foreign currency derivatives	691												691
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interests									$	140,987			140,987
Total Liabilities	$	21,775			$	408,200			$	140,987			$	570,962

Fair Value Inputs, Liabilities, Quantitative Information

Quantitative Information about Level 3 Fair Value Measurements
	Fair Value	Valuation		Range
Item	February 28, 2014	Technique	Unobservable Input	(Weighted Average)
Accrued liability for contingent crack spread payments related to purchase of noncontrolling interests	$140,631	Adjusted Black-Scholes option pricing model	Forward crack spread margin on February 28, 2014 (a)	$14.81-$22.65 ($18.71)
			Contractual target crack spread margin (b)	$17.50
			Expected volatility (c)	121.03%
			Risk-free interest rate (d)	1.80-2.60% (2.23%)
			Expected life - years (e)	0.50-3.50 (2.12)

(a) Represents forward crack spread margin quotes and management estimates based on future settlement dates

(b) Represents the minimum contractual threshold that would require settlement with the counterparties

(c) Represents quarterly adjusted volatility estimates derived from daily historical market data

(d) Represents yield curves for U.S. Treasury securities

(e) Represents the range in the number of years remaining related to each contingent payment

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation

The following table represents a reconciliation of liabilities measured at fair value using significant unobservable inputs (Level 3) for the three months ended February 28, 2014 and 2013, respectively:

		Level 3 Liabilities
		Accrued liability for contingent crack spread payments related to purchase of noncontrolling interests
		2014				2013
		(Dollars in thousands)
Balances, November 30, 2013 and 2012, respectively		$	150,991			$	170,621
Total (gains) losses included in cost of goods sold		(10,360		)		(29,634		)
Balances, February 28, 2014 and February 28, 2013, respectively		$	140,631			$	140,987

The following table represents a reconciliation of liabilities measured at fair value using significant unobservable inputs (Level 3) for the six months ended February 28, 2014 and 2013, respectively:

		Level 3 Liabilities
		Accrued liability for contingent crack spread payments related to purchase of noncontrolling interests
		2014				2013
		(Dollars in thousands)
Balances, August 31, 2013 and 2012, respectively		$	134,134			$	127,516
Total (gains) losses included in cost of goods sold		6,497				13,471
Balances, February 28, 2014 and February 28, 2013, respectively		$	140,631			$	140,987

Fair Value, Measurements, Recurring [Member] | 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

114,261

114,084

79,333

Assets, Fair Value Disclosure

178,244

179,419

133,157

Liabilities, Fair Value Disclosure

93,618

65,109

21,775

Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Inventory, Current, Fair Value Disclosure

1,318,428

1,203,383

1,697,214

Other Assets, Fair Value Disclosure

Assets, Fair Value Disclosure

1,875,968

1,637,940

2,144,568

Liabilities, Fair Value Disclosure

460,075

399,958

408,200

Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Inventory, Current, Fair Value Disclosure

Other Assets, Fair Value Disclosure

Assets, Fair Value Disclosure

Liabilities, Fair Value Disclosure

140,631

134,134

140,987

Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Inventory, Current, Fair Value Disclosure

1,318,428

1,203,383

1,697,214

Other Assets, Fair Value Disclosure

114,261

114,084

79,333

Assets, Fair Value Disclosure

2,054,212

1,817,359

2,277,725

Liabilities, Fair Value Disclosure

694,324

599,201

570,962

Commodity and Freight Derivatives [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Derivative Asset, Fair Value, Gross Asset

615,178

468,673

485,222

Derivative Liability, Fair Value, Gross Liability

550,870

458,893

428,866

Commodity and Freight Derivatives [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Derivative Asset, Fair Value, Gross Asset

57,638

58,441

38,327

Derivative Liability, Fair Value, Gross Liability

90,989

59,184

21,084

Commodity and Freight Derivatives [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Derivative Asset, Fair Value, Gross Asset

557,540

410,233

446,895

Derivative Liability, Fair Value, Gross Liability

459,881

399,710

407,782

Commodity and Freight Derivatives [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]

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 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Derivative Asset, Fair Value, Gross Asset

615,178

468,674

485,222

Derivative Liability, Fair Value, Gross Liability

550,870

458,894

428,866

Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | 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 [Member] | Fair Value, Inputs, Level 2 [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Derivative Asset, Fair Value, Gross Asset

24,139

459

Derivative Liability, Fair Value, Gross Liability

194

248

418

Interest Rate Swap [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [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 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Derivative Asset, Fair Value, Gross Asset

24,139

459

Derivative Liability, Fair Value, Gross Liability

194

248

418

Foreign Exchange Contract [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Derivative Asset, Fair Value, Gross Asset

6,345

7,079

15,497

Derivative Liability, Fair Value, Gross Liability

2,629

5,925

691

Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Derivative Asset, Fair Value, Gross Asset

6,345

6,894

15,497

Derivative Liability, Fair Value, Gross Liability

2,629

5,925

691

Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Derivative Asset, Fair Value, Gross Asset

185

Derivative Liability, Fair Value, Gross Liability

Foreign Exchange Contract [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]

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 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Derivative Asset, Fair Value, Gross Asset

6,345

7,079

15,497

Derivative Liability, Fair Value, Gross Liability

$ 2,629

$ 5,925

$ 691

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