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Income Taxes (Details) (USD $)
3 Months Ended 6 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Income Tax Examination [Line Items]        
Income tax benefit $ 6,324,000 $ (14,291,000) $ (63,718,000) $ (111,803,000)
Reduction in unrecognized tax benefits     16,500,000  
Internal Revenue Service (IRS) [Member]
       
Income Tax Examination [Line Items]        
Income tax benefit 10,200,000      
Foreign Tax Authority [Member]
       
Income Tax Examination [Line Items]        
Income tax benefit $ 2,800,000