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Other Assets - Schedule of Other Assets (Details) (USD $)
In Thousands, unless otherwise specified
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Aug. 31, 2011
Finite-Lived Intangible Assets [Line Items]        
Goodwill $ 158,696 $ 85,063    
Finite-lived intangible assets, net 55,454      
Notes receivable 166,901 143,343    
Long-term receivable 40,718 38,704    
Prepaid pension and other benefits 186,342 187,270    
Capitalized major maintenance 67,643 109,408 70,554 80,752
Other 119,325 56,896    
Other assets 795,079 656,160    
Customer lists
       
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets, net 43,748 16,352    
Accumulated amortization 26,114 20,063    
Trademarks and other intangible assets
       
Finite-Lived Intangible Assets [Line Items]        
Finite-lived intangible assets, net 11,706 19,124    
Accumulated amortization $ 29,587 $ 25,982