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Notes Payable, Long-Term Debt and Capital Lease Obligations (Parenthetical) (Details 3) - USD ($)
$ in Thousands
9 Months Ended
May. 31, 2015
Aug. 31, 2014
May. 31, 2012
Debt Instrument [Line Items]      
Total assets $ 8,965,533 $ 8,479,746  
Total liabilities $ 6,634,595 $ 6,219,378  
7.750% Senior Notes Due 2016      
Debt Instrument [Line Items]      
Senior Notes, stated interest rate 7.75%    
Senior Notes, maturity year 2016    
8.250% Senior Notes Due 2018      
Debt Instrument [Line Items]      
Senior Notes, stated interest rate 8.25%    
Senior Notes, maturity year 2018    
5.625% Senior Notes Due 2020      
Debt Instrument [Line Items]      
Senior Notes, stated interest rate 5.625%    
Senior Notes, maturity year 2020    
4.700% Senior Notes due 2022      
Debt Instrument [Line Items]      
Senior Notes, stated interest rate 4.70%    
Senior Notes, maturity year 2022    
Variable Interest Entity      
Debt Instrument [Line Items]      
VIE credit capacity     $ 60,000
Total assets $ 30,800    
Notes receivable 30,200    
Total liabilities 30,100    
Debt obligation utilized $ 30,000    
Maximum | Variable Interest Entity      
Debt Instrument [Line Items]      
Lease agreement period P5Y