Income and Other Taxes - Schedule of (Loss) Income from Operations before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Domestic	$ (49,371)	$ (40,608)
Foreign	0	(292)
Loss from continuing operations before income tax (expense) benefit	$ (49,371)	$ (40,900)