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