Income and Other Taxes - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Loss Carryforwards [Line Items]
Income tax benefit (expense)	$ 139	$ (572)
Effective tax rate on continuing operations	(0.60%)	2.20%
Portion of operating loss carryforward subject to limitation	$ 165,400
Portion of operating loss carryforward not subject to limitation	259,500
Foreign Income And Research And Development Credit
Operating Loss Carryforwards [Line Items]
Tax credit	500
Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	424,900
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	5,800
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 78,800