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Other Assets - Rollforward of Capitalized Maintenance Activity (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2011
Capitalized Maintenance Expense [Roll Forward]        
Cost Deferred $ 3,305 $ 73,701 $ 23,443  
Amortization (45,070) (34,847) (33,641)  
Write-Offs 0 0 0  
Capitalized major maintenance $ 67,643 $ 109,408 $ 70,554 $ 80,752