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v3.5.0.2

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Aug. 31, 2016 | Aug. 31, 2015 | Aug. 31, 2014
Operating Loss Carryforwards [Line Items] |  |  |
Federal | $ (30,758) | $ 29,348 | $ (23,444)
Change in valuation allowance for deferred tax asset | 40,600 |  |
Operating Loss Carryforwards | 676,600 |  |
Deferred Tax Assets, Gross [Abstract] |  |  |
Accrued expenses | 87,251 | 96,270 |
Postretirment health care and deferred compensation | 111,983 | 89,934 |
Deferred Tax Assets, Tax Credit Carryforwards | 143,252 | 109,756 |
Deferred Tax Assets, Operating Loss Carryforwards | 155,966 | 85,860 |
Other | 64,669 | 68,625 |
Deferred tax assets valuation | (194,277) | (98,024) |
Deferred tax assets | 368,844 | 352,421 |
Deferred Tax Liabilities, Gross [Abstract] |  |  |
Pension | 26,516 | 20,732 |
Investments | 109,610 | 98,291 |
Major maintenance | 4,970 | 36,135 |
Property, plant and equipment | 679,266 | 654,057 |
Deferred Tax Liabilities, Other | 33,779 | 25,836 |
Deferred Tax Liabilities, Gross | 854,141 | 835,051 |
Net deferred tax liabilities | 485,297 | 482,630 |
Domestic Tax Authority [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Federal | 25,600 |  |
NCRA [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Change in valuation allowance for deferred tax asset | 55,600 |  |
Operating Loss Carryforwards | $ 133,500 | 62,200 |
Other Assets [Member] |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent |  | $ 1,600 |

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