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Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 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 $ 9,043,000 $ 11,154,000 $ 0  
Effective income tax rate   39.10%