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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Aug. 31, 2017 | Aug. 31, 2016
--- | --- | ---
Deferred Tax Assets, Gross [Abstract] |  |
Accrued expenses | $ 226,964 | $ 87,251
Postretirment health care and deferred compensation | 82,682 | 111,983
Deferred Tax Assets, Tax Credit Carryforwards | 166,213 | 143,252
Deferred Tax Assets, Operating Loss Carryforwards | 169,724 | 155,966
Deferred Tax Assets, Nonqualified Equity | 152,835 | 30,168
Other | 55,119 | 30,627
Deferred tax assets valuation | (284,716) | (194,277)
Deferred tax assets | 568,821 | 364,970
Deferred Tax Liabilities, Gross [Abstract] |  |
Pension | 31,050 | 26,516
Investments | 129,985 | 107,716
Major maintenance | 2,115 | 4,970
Property, plant and equipment | 712,195 | 681,160
Deferred Tax Liabilities, Other | 25,964 | 29,905
Deferred Tax Liabilities, Gross | 901,309 | 850,267
Net deferred tax liabilities | $ 332,488 | $ 485,297

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