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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Income Taxes [Abstract]    
Income tax expense $ 4,093us-gaap_IncomeTaxExpenseBenefit $ 5,583us-gaap_IncomeTaxExpenseBenefit
Estimated effective income tax rate 35.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations 35.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations