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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Feb. 28, 2014
Feb. 28, 2013
Income Taxes [Abstract]        
Income tax expense $ 7,339 $ 10,137 $ 12,922 $ 17,792
Estimated effective income tax rate     35.30% 34.30%