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Investments Investment in NCRA (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Nov. 30, 2013 National Cooperative Refinery Association [Member] | Nov. 30, 2012 National Cooperative Refinery Association [Member] | Aug. 31, 2013 National Cooperative Refinery Association [Member] | Oct. 31, 2013 Crack Spread Contingent Payment [Member] | Nov. 30, 2013 Contingent Liability [Member] National Cooperative Refinery Association [Member]
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage | 84.00% |  | 79.20% |  |
Business Combination, Step Acquisition, Amount | $ 66.0 | $ 66.0 |  |  |
Business Acquisition, Cost of Acquired Entity, Cash Paid |  |  |  | 16.5 |
Business Acquisition, Contingent Consideration, at Fair Value |  |  |  |  | $ 151.0

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