Debt - Principal Payment Schedule (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Debt Instrument [Line Items]
Gross Amount	$ 367,762	$ 316,250
Senior Notes
Debt Instrument [Line Items]
Fiscal 2024	34,389
Fiscal 2025	103,373
Fiscal 2026	0
Fiscal 2027	0
Fiscal 2028	0
Thereafter	230,000
Gross Amount	367,762
Senior Notes \| 2029 Convertible Notes
Debt Instrument [Line Items]
Fiscal 2024	0
Fiscal 2025	0
Fiscal 2026	0
Fiscal 2027	0
Fiscal 2028	0
Thereafter	230,000
Gross Amount	230,000
Senior Notes \| 2025 Convertible Notes
Debt Instrument [Line Items]
Fiscal 2024	0
Fiscal 2025	103,373
Fiscal 2026	0
Fiscal 2027	0
Fiscal 2028	0
Thereafter	0
Gross Amount	103,373
Senior Notes \| 2024 Convertible Notes
Debt Instrument [Line Items]
Fiscal 2024	34,389
Fiscal 2025	0
Fiscal 2026	0
Fiscal 2027	0
Fiscal 2028	0
Thereafter	0
Gross Amount	$ 34,389

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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