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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Operating Loss Carryforwards [Line Items]    
Change in valuation allowance for deferred tax asset $ 8,800  
Operating Loss Carryforwards 431,400  
Deferred Tax Assets, Gross [Abstract]    
Accrued expenses 96,270 $ 76,255
Postretirment health care and deferred compensation 89,934 83,346
Deferred Tax Assets, Tax Credit Carryforwards 109,756 70,881
Deferred Tax Assets, Operating Loss Carryforwards 85,860 53,793
Other 68,625 52,956
Deferred tax assets valuation (98,024) (111,509)
Deferred tax assets 352,421 225,722
Deferred Tax Liabilities, Gross [Abstract]    
Pension 20,732 12,855
Investments 98,291 88,425
Major maintenance 36,135 26,020
Property, plant and equipment 654,057 576,007
Deferred Tax Liabilities, Other 25,836 0
Deferred Tax Liabilities, Gross 835,051 703,307
Net deferred tax liabilities 482,630 477,585
NCRA [Member]    
Operating Loss Carryforwards [Line Items]    
Change in valuation allowance for deferred tax asset 20,100  
Operating Loss Carryforwards 62,200 63,400
Other Assets [Member]    
Operating Loss Carryforwards [Line Items]    
Deferred Tax Assets, Net of Valuation Allowance, Noncurrent $ 1,600 $ 2,600