XML 101 R64.htm IDEA: XBRL DOCUMENT v2.4.0.8
Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) (USD $)
Aug. 31, 2014
Aug. 31, 2013
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards $ 247,800,000  
Deferred Tax Assets, Gross [Abstract]    
Accrued expenses 76,255,000 66,973,000
Postretirment health care and deferred compensation 83,346,000 57,130,000
Deferred Tax Assets, Tax Credit Carryforwards 70,881,000 97,242,000
Deferred Tax Assets, Operating Loss Carryforwards 53,793,000 57,174,000
Other 52,956,000 40,868,000
Deferred tax assets valuation (111,509,000) (79,623,000)
Deferred tax assets 225,722,000 239,764,000
Deferred Tax Liabilities, Gross [Abstract]    
Pension 12,855,000 6,752,000
Investments 88,425,000 91,453,000
Major maintenance 26,020,000 31,960,000
Property, plant and equipment 576,007,000 529,101,000
Deferred Tax Liabilities, Gross 703,307,000 659,266,000
Net deferred tax liabilities 477,585,000 419,502,000
NCRA [Member]
    
Operating Loss Carryforwards [Line Items]    
Operating Loss Carryforwards $ 63,400,000 $ 88,100,000