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v3.3.1.900

Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Nov. 30, 2015 USD ($) Refineries | Nov. 30, 2014 USD ($) | Aug. 31, 2015
Finite-Lived Intangible Assets [Line Items] |  |  |
Number of Refineries | Refineries | 2 |  |
Expenditures for Major Repairs | $ 18,897 | $ 1,337 |
Capitalized Maintenance Expense, Deferred During the Period | $ 18,900 | $ 1,300 |
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 |  |
National Cooperative Refinery Association [Member] |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage |  |  | 88.90%

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