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Business Acquisitions (Details 3) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Aug. 31, 2013
Aug. 31, 2012
Business Acquisitions [Abstract]    
Net revenue $ 18,150,599 $ 17,263,831
Net income $ 237,119 $ 408,315
Earnings per share, basic $ 1.17 $ 1.98
Earnings per share, diluted $ 1.14 $ 1.93