Debt (Tables)

6 Months Ended

Mar. 31, 2024

Debt Disclosure [Abstract]

Schedule of Long Term Debt Instruments

The following table presents the Company's debt instruments outstanding:

	March 31, 2024						March 31, 2023						September 30, 2023
(in thousands)	Gross Amount		Debt Issuance Costs		Carrying Amount		Gross Amount		Debt Issuance Costs		Carrying Amount		Gross Amount		Debt Issuance Costs		Carrying Amount
2029 Convertible Notes	$	230,000	$	(6,244)	$	223,756	$	230,000	$	(7,209)	$	222,791	$	230,000	$	(6,716)	$	223,284
2025 Convertible Notes	103,373		(556)		102,817		103,373		(1,061)		102,312		103,373		(810)		102,563
2024 Convertible Notes	34,389		(42)		34,347		34,389		(205)		34,184		34,389		(124)		34,265
Total	$	367,762	$	(6,842)	$	360,920	$	367,762	$	(8,475)	$	359,287	$	367,762	$	(7,650)	$	360,112
Less current portion	34,389		(42)		34,347		—		—		—		34,389		(124)		34,265
Total long-term debt	$	333,373	$	(6,800)	$	326,573	$	367,762	$	(8,475)	$	359,287	$	333,373	$	(7,526)	$	325,847

Schedule of Maturities of Long-Term Debt

The following table presents the Company’s contractual maturities related to the debt instruments as of March 31, 2024:

	Schedule of Contractual Maturities
(in thousands)	2029 Convertible Notes		2025 Convertible Notes		2024 Convertible Notes		Total
Remaining 2024	$	—	$	—	$	34,389	$	34,389
Fiscal 2025	—		103,373		—		103,373
Fiscal 2026	—		—		—		—
Fiscal 2027	—		—		—		—
Fiscal 2028	—		—		—		—
Thereafter	230,000		—		—		230,000
Total long-term debt	$	230,000	$	103,373	$	34,389	$	367,762

Schedule of Interest Expense

The following table presents the Company’s interest expense related to the Convertible Notes for the three and six months ended March 31, 2024 and 2023:

	Three Months Ended March 31,				Six Months Ended March 31,
(in thousands)	2024		2023		2024		2023
2029 Convertible Notes:
Contractual interest expense	$	2,157	$	2,156	$	4,313	$	2,587
Amortization of deferred financing costs	228		197		472		249
Total interest expense	$	2,385	$	2,353	$	4,785	$	2,836
2025 Convertible Notes:
Contractual interest expense	$	614	$	614	$	1,228	$	1,556
Amortization of deferred financing costs	123		120		254		308
Gain on extinguishment	—		—		—		(5,389)
Total interest expense	$	737	$	734	$	1,482	$	(3,525)
2024 Convertible Notes:
Contractual interest expense	$	247	$	247	$	494	$	1,123
Amortization of deferred financing costs	39		41		81		179
Loss on extinguishment	—		—		—		8,935
Total interest expense	$	286	$	288	$	575	$	10,237