Income Taxes - Additional Information (Detail) - USD ($) $ in Millions |
12 Months Ended | |
---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
|
Income Tax Disclosure [Abstract] | ||
Valuation allowance against deferred tax assets | 100.00% | |
Gross federal net operating loss carry forwards | $ 185.1 | |
Gross federal estimated net operating loss carry forwards | $ 78.7 | |
Gross state net operating loss carry forwards | $ 285.4 | |
Gross state estimated net operating loss carry forwards | $ 133.9 |