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Income Taxes - Additional Information (Detail)
6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Tax Examination [Line Items]    
Effective tax rates 37.20% 39.20%
Federal statutory rate 35.00%  
Domestic Tax Authority [Member] | Earliest Tax Year [Member]    
Income Tax Examination [Line Items]    
Open tax year 2012  
Domestic Tax Authority [Member] | Latest Tax Year [Member]    
Income Tax Examination [Line Items]    
Open tax year 2016