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Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
May 31, 2016 USD ($) Refineries | May 31, 2015 USD ($) | May 31, 2016 USD ($) Refineries | May 31, 2015 USD ($) | Sep. 30, 2015 | Aug. 31, 2015
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Number of Refineries | Refineries | 2 |  | 2 |  |  |
Expenditures for Major Repairs |  |  | $ 19,338 | $ 130,302 |  |
Capitalized Maintenance Expense, Deferred During the Period | $ 200 | $ 122,800 | $ 19,300 | $ 130,300 |  |
Minimum [Member] | Major Maintenance Activities Requiring Shutdown [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 2 years |  |  |
Maximum [Member] | Major Maintenance Activities Requiring Shutdown [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 4 years |  |  |
Energy [Member] | National Cooperative Refinery Association [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage |  |  |  |  | 100.00% | 88.90%

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