Long-Term Debt - Schedule of Accrued Interest Payable on Long Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2020	Jun. 30, 2019	Aug. 31, 2017
Line of Credit
Debt Instrument [Line Items]
Total Accrued Interest Payable on Long-Term Debt	$ 3,364		$ 815
Convertible notes | 4.75% convertible senior notes
Debt Instrument [Line Items]
Total Accrued Interest Payable on Long-Term Debt	$ 0		$ 3,564
Weighted Average Interest Rate (as a percent)	4.75%	4.75%	4.75%			4.75%
Convertible notes | 5.625% convertible senior notes
Debt Instrument [Line Items]
Total Accrued Interest Payable on Long-Term Debt	$ 3,896		$ 3,896
Weighted Average Interest Rate (as a percent)	5.625%		5.625%	5.625%	5.625%
Convertible notes | 5.75% exchangeable senior notes
Debt Instrument [Line Items]
Total Accrued Interest Payable on Long-Term Debt	$ 2,332		$ 2,474
Weighted Average Interest Rate (as a percent)	5.75%		5.75%	5.75%
Convertible notes | 7.75% convertible senior notes
Debt Instrument [Line Items]
Total Accrued Interest Payable on Long-Term Debt	$ 741		$ 0
Weighted Average Interest Rate (as a percent)	7.75%
Subordinated Debt
Debt Instrument [Line Items]
Total Accrued Interest Payable on Long-Term Debt	$ 1,633		581
Long-term Debt
Debt Instrument [Line Items]
Total Accrued Interest Payable on Long-Term Debt	$ 11,966		$ 11,330