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Commitments and Contingencies - Purchase Obligations (Details) (USD $)
 12 Months Ended
Aug. 31, 2014
Aug. 31, 2013
Aug. 31, 2012
Unrecorded Unconditional Purchase Obligation [Line Items]      
Long-term unconditional purchase obligations, Total $ 485,739,000    
Long-term unconditional purchase obligations, Less than 1 Year 68,008,000    
Long-term unconditional purchase obligations, 1 - 3 Years 124,367,000    
Long-term unconditional purchase obligations, 3 - 5 Years 87,809,000    
Long-term unconditional purchase obligations, More than 5 Years 205,555,000    
Long-term unconditional purchase obligations, minimum amount required 415,000,000    
Long-term unconditional purchase obligations, period amount purchase $ 65,500,000 $ 62,400,000 $ 47,800,000