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Notes Payable and Long-Term Debt - Schedule of Interest, Net (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2013
Feb. 29, 2012
Debt Disclosure [Abstract]        
Interest expense $ 23,219 $ 22,187 $ 47,655 $ 45,494
Interest-purchase of NCRA noncontrolling interest 33,991 15,856 80,687 15,856
Interest Costs Capitalized (2,694) (1,903) (5,596) (3,709)
Interest income (1,131) (1,509) (2,151) (2,203)
Interest Income (Expense), Net $ 53,385 $ 34,631 $ 120,595 $ 55,438