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Notes Payable and Long-Term Debt - Schedule of Interest, Net (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Aug. 31, 2012 | Aug. 31, 2011 | Aug. 31, 2010
Debt Disclosure [Abstract] |  |  |
Interest expense | $ 94,090 | $ 83,044 | $ 69,901
Interest-purchase of NCRA noncontrolling interest | 113,184 |  |
Interest Costs Capitalized | (8,882) | (5,487) | (6,212)
Interest income | (5,129) | (2,722) | (5,365)
Interest Income (Expense), Net | $ 193,263 | $ 74,835 | $ 58,324

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