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Acquisitions - National Cooperative Refinery Association Acquisition (Details) $ in Millions |  | 12 Months Ended | 37 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 01, 2016 USD ($) | Aug. 31, 2017 USD ($) | Aug. 31, 2015 USD ($) | Sep. 30, 2015 USD ($) | Sep. 01, 2015 | Nov. 29, 2011 contingent_payments
National Cooperative Refinery Association |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage |  |  |  |  | 100.00% | 74.40%
Business Combination, Consideration Transferred |  |  |  | $ 351.0 |  |
Number of purchase price payments | contingent_payments |  |  |  |  |  | 2
National Cooperative Refinery Association | Interest, Net |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Patronage earned by member |  | $ 0.0 | $ 31.0 |  |  |
Crack Spread Contingent Payment [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Acquisition, Contingent Consideration, Potential Cash Payment | $ 19.1 | $ 0.0 |  |  |  |

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