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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
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