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Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2016
Mar. 31, 2015
Sep. 30, 2015
Income Tax Disclosure [Abstract]        
Valuation allowance on deferred tax assets $ 1,700,000 $ 1,700,000   $ 1,700,000
Income tax provision $ 1,564,000 $ 2,111,000 $ 0  
Effective income tax rate   38.90%