Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Valuation allowance against deferred tax assets	100.00%
Gross federal net operating loss carry forwards	$ 569,000,000.0
Gross state net operating loss carry forwards	626,500,000
Unrecognized tax benefits	0	$ 0
Unrecognized tax benefits, penalties related to uncertain tax positions	0	0
Unrecognized tax benefits, interest related to uncertain tax positions	$ 0	$ 0