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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
May 31, 2014
May 31, 2013
May 31, 2014
May 31, 2013
Income Taxes [Abstract]        
Income tax expense $ 9,001 $ 13,687 $ 21,923 $ 31,479
Estimated effective income tax rate     35.30% 34.40%