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Basis of Presentation and Summary of Significant Accounting Policies (Details 1) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Net realized gains or losses related to foreign currency forward contracts      
Realized gains (losses), net $ 919 $ (466) $ (300)