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Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2015
Income Tax Disclosure [Abstract]      
Valuation allowance on deferred tax assets $ 1,700,000   $ 1,700,000
Income tax provision $ 547,000 $ 0  
Effective income tax rate 38.10%