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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Aug. 31, 2013
Aug. 31, 2012
Deferred Tax Assets, Gross [Abstract]    
Accrued expenses $ 66,973 $ 89,844
Postretirment health care and deferred compensation 57,130 107,817
Deferred Tax Assets, Tax Credit Carryforwards 97,242 118,752
Deferred Tax Assets, Operating Loss Carryforwards 57,174 30,272
Other 40,868 57,429
Deferred tax assets valuation (79,623) (56,659)
Deferred tax assets 239,764 347,455
Deferred Tax Liabilities, Gross [Abstract]    
Pension 6,752 35,516
Investments 91,453 120,879
Major maintenance 31,960 9,141
Property, plant and equipment 529,101 453,863
Other 0 175
Deferred Tax Liabilities, Gross 659,266 619,574
Net deferred tax liabilities $ 419,502 $ 272,119