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Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details) (USD $) | 6 Months Ended |
--- | --- | ---
Feb. 28, 2014 Refineries | Feb. 28, 2013 | Aug. 31, 2013
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | $ 104,615,000 | $ 88,147,000 | $ 85,100,000
Goodwill, Acquired During Period | 19,400,000 |  |
Payments to Acquire Businesses, Net of Cash Acquired | 97,858,000 | 8,074,000 |
Finite-Lived Intangible Assets, Gross | 113,500,000 | 81,800,000 | 81,500,000
Finite-Lived Intangible Assets, Accumulated Amortization | 46,700,000 | 40,500,000 | 46,000,000
Finite-lived Intangible Assets Acquired | 36,200,000 | 1,400,000 |
Amortization of Intangible Assets | 4,900,000 | 5,000,000 |
Finite-Lived Intangible Assets, Amortization Expense, Next Rolling Twelve Months | 8,141,000 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 8,654,000 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 7,902,000 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 6,334,000 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 3,543,000 |  |
Thereafter | 31,407,000 |  |
Finite-Lived Intangible Assets, Net | 65,981,000 |  |
Number of Refineries | 2 |  |
Minimum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 2 years |  |
Minimum [Member] | Major Maintenance Activities Requiring Shutdown [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 2 years |  |
Maximum [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 30 years |  |
Maximum [Member] | Major Maintenance Activities Requiring Shutdown [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-Lived Intangible Asset, Useful Life | 4 years |  |
Ag Business [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Goodwill | 96,552,000 | 80,084,000 |
Ag Business [Member] | Series of Individually Immaterial Business Acquisitions [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Payments to Acquire Businesses, Gross | $ 97,900,000 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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