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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Aug. 31, 2015 | Aug. 31, 2014
Operating Loss Carryforwards [Line Items] |  |
Change in valuation allowance for deferred tax asset | $ 8,800 |
Operating Loss Carryforwards | 431,400 |
Deferred Tax Assets, Gross [Abstract] |  |
Accrued expenses | 96,270 | $ 76,255
Postretirment health care and deferred compensation | 89,934 | 83,346
Deferred Tax Assets, Tax Credit Carryforwards | 109,756 | 70,881
Deferred Tax Assets, Operating Loss Carryforwards | 85,860 | 53,793
Other | 68,625 | 52,956
Deferred tax assets valuation | (98,024) | (111,509)
Deferred tax assets | 352,421 | 225,722
Deferred Tax Liabilities, Gross [Abstract] |  |
Pension | 20,732 | 12,855
Investments | 98,291 | 88,425
Major maintenance | 36,135 | 26,020
Property, plant and equipment | 654,057 | 576,007
Deferred Tax Liabilities, Other | 25,836 | 0
Deferred Tax Liabilities, Gross | 835,051 | 703,307
Net deferred tax liabilities | 482,630 | 477,585
NCRA [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Change in valuation allowance for deferred tax asset | 20,100 |
Operating Loss Carryforwards | 62,200 | 63,400
Other Assets [Member] |  |
Operating Loss Carryforwards [Line Items] |  |
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent | $ 1,600 | $ 2,600

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