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Segment Reporting - Segment Information (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Aug. 31, 2012 | Aug. 31, 2011 | Aug. 31, 2010
Segment Reporting Information [Line Items] |  |  |
Revenues | $ 40,599,286 | $ 36,915,834 | $ 25,267,931
Cost of goods sold | 38,588,143 | 35,512,988 | 24,397,410
Gross profit | 2,011,143 | 1,402,846 | 870,521
Marketing, general and administrative | 498,233 | 438,498 | 366,582
Operating earnings | 1,512,910 | 964,348 | 503,939
Loss (gain) on investments | 5,465 | (126,729) | (29,433)
Interest, net | 193,263 | 74,835 | 58,324
Equity income from investments | (102,389) | (131,414) | (108,787)
Income before income taxes | 1,416,571 | 1,147,656 | 583,835
Intersegment Revenue | 0 | 0 | 0
Goodwill | 81,693 | 26,409 | 23,038
Capital expenditures | 468,611 | 310,670 | 324,262
Depreciation and amortization | 219,632 | 220,694 | 202,922
Total identifiable assets | 13,423,151 | 12,217,010 |
Energy |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 12,816,542 | 11,467,381 | 8,799,890
Cost of goods sold | 11,514,463 | 10,694,687 | 8,437,504
Gross profit | 1,302,079 | 772,694 | 362,386
Marketing, general and administrative | 155,786 | 142,708 | 123,834
Operating earnings | 1,146,293 | 629,986 | 238,552
Loss (gain) on investments | 4,008 | 1,027 | (269)
Interest, net | 122,302 | 5,829 | 9,939
Equity income from investments | (7,537) | (6,802) | (5,554)
Income before income taxes | 1,027,520 | 629,932 | 234,436
Intersegment Revenue | (467,583) | (383,389) | (295,536)
Goodwill | 1,165 | 1,165 | 1,165
Capital expenditures | 294,560 | 198,692 | 197,637
Depreciation and amortization | 109,496 | 126,018 | 118,071
Total identifiable assets | 3,684,571 | 3,883,205 |
Ag Business |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 28,181,445 | 25,767,033 | 16,715,055
Cost of goods sold | 27,544,040 | 25,204,301 | 16,258,679
Gross profit | 637,405 | 562,732 | 456,376
Marketing, general and administrative | 273,757 | 229,369 | 187,640
Operating earnings | 363,648 | 333,363 | 268,736
Loss (gain) on investments | 1,049 | (118,344) | (421)
Interest, net | 57,915 | 57,438 | 33,039
Equity income from investments | (22,737) | (40,482) | (31,248)
Income before income taxes | 327,421 | 434,751 | 267,366
Goodwill | 73,630 | 18,346 | 14,975
Capital expenditures | 168,825 | 107,866 | 122,468
Depreciation and amortization | 92,538 | 79,231 | 69,170
Total identifiable assets | 6,816,809 | 5,276,537 |
Corporate and Other |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | 68,882 | 64,809 | 48,522
Cost of goods sold | (2,777) | (2,611) | (3,237)
Gross profit | 71,659 | 67,420 | 51,759
Marketing, general and administrative | 68,690 | 66,421 | 55,108
Operating earnings | 2,969 | 999 | (3,349)
Loss (gain) on investments | 408 | (9,412) | (28,743)
Interest, net | 13,046 | 11,568 | 15,346
Equity income from investments | (72,115) | (84,130) | (71,985)
Income before income taxes | 61,630 | 82,973 | 82,033
Goodwill | 6,898 | 6,898 | 6,898
Capital expenditures | 5,226 | 4,112 | 4,157
Depreciation and amortization | 17,598 | 15,445 | 15,681
Total identifiable assets | 2,921,771 | 3,057,268 |
Reconciling Amounts |  |  |
Segment Reporting Information [Line Items] |  |  |
Revenues | (467,583) | (383,389) | (295,536)
Cost of goods sold | (467,583) | (383,389) | (295,536)
Gross profit | 0 | 0 | 0
Marketing, general and administrative |  |  |
Operating earnings | 0 | 0 | 0
Income before income taxes | 0 | 0 | 0
Intersegment Revenue | $ 467,583 | $ 383,389 | $ 295,536

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