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Income Taxes - Additional Information (Detail)
3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Effective income tax rate reconciliation, percent 31.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations 32.00%us-gaap_EffectiveIncomeTaxRateContinuingOperations