Summary of Significant Accounting Policies - Going Concern Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Restructuring Cost and Reserve [Line Items]
Net loss	$ (75,359)	$ (24,333)
Cash and cash equivalents	26,706	25,619
Net cash used in operating activities - continuing operations	(30,270)	$ (24,258)
Revolving Credit Facility | New A B L Credit Agreement [Member]
Restructuring Cost and Reserve [Line Items]
Remaining borrowing capacity	$ 9,900