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Income Taxes (Details) (USD $)
3 Months Ended 6 Months Ended
Feb. 28, 2015
Feb. 28, 2014
Feb. 28, 2015
Feb. 28, 2014
Income Taxes [Abstract]        
Income tax expense $ 5,143,000us-gaap_IncomeTaxExpenseBenefit $ 7,339,000us-gaap_IncomeTaxExpenseBenefit $ 9,236,000us-gaap_IncomeTaxExpenseBenefit $ 12,922,000us-gaap_IncomeTaxExpenseBenefit
Estimated effective income tax rate     35.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations 35.30%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Favorable discrete item $ 0us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions $ 0us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions $ 0us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions $ 0us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions