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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified | Aug. 31, 2012 | Aug. 31, 2011
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Deferred Tax Assets, Gross [Abstract] |  |
Accrued expenses | $ 89,844 | $ 91,458
Postretirment health care and deferred compensation | 107,817 | 100,256
Deferred Tax Assets, Tax Credit Carryforwards | 118,752 | 102,120
Deferred Tax Assets, Operating Loss Carryforwards | 30,272 | 71,470
Other | 57,429 | 55,414
Deferred tax assets valuation | (56,659) | (47,599)
Deferred tax assets | 347,455 | 373,119
Deferred Tax Liabilities, Gross [Abstract] |  |
Pension | 35,516 | 56,702
Investments | 120,879 | 91,290
Major maintenance | 9,141 | 4,591
Property, plant and equipment | 453,863 | 453,805
Other | 175 | 0
Deferred Tax Liabilities, Gross | 619,574 | 606,388
Net deferred tax liabilities | $ 272,119 | $ 233,269

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