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Property, Plant and Equipment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 17 Months Ended |
--- | --- | --- | --- | ---
May. 31, 2015 | May. 31, 2014 | May. 31, 2015 | May. 31, 2014 | May. 31, 2015 | Aug. 31, 2014
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, plant and equipment | $ 4,648,282 |  | $ 4,648,282 |  | $ 4,648,282 | $ 4,031,023
Depreciation | $ 75,800 | $ 62,400 | 219,000 | $ 182,500 |  |
Construction in Progress [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Property, Plant and Equipment, Additions |  |  | 540,500 |  |  |
Spiritwood [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Total construction cost, estimate |  |  | $ 3,000,000 |  |  |
Spiritwood [Member] | Asset under Construction [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Acquisition of property, plant and equipment |  |  |  |  | $ 74,400 |

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