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Notes Payable and Long-Term Debt - Schedule of Long-Term Debt Payable (Details) (USD $)
In Thousands, unless otherwise specified
Aug. 31, 2013
Aug. 31, 2012
Debt Disclosure [Abstract]    
Long-term Debt, Repayments in 2013 $ 156,612  
Long-term Debt, Repayments in 2014 164,022  
Long-term Debt, Repayments in 2015 130,219  
Long-term Debt, Repayments in 2016 149,832  
Long-term Debt, Repayments in 2017 162,103  
Long-term Debt, Repayments after 2017 844,244  
Total long-term debt $ 1,607,032 $ 1,440,353