Debt (Tables)

6 Months Ended

Mar. 31, 2023

Debt Disclosure [Abstract]

Schedule of Long Term Debt Instruments

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

	March 31, 2023						March 31, 2022						September 30, 2022
(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	$	(7,209)	$	222,791	$	—	$	—	$	—	$	—	$	—	$	—
2025 Convertible Notes	103,373		(1,061)		102,312		172,500		(2,580)		169,920		172,500		(2,172)		170,328
2024 Convertible Notes	34,389		(205)		34,184		143,750		(1,502)		142,248		143,750		(1,175)		142,575
Total long-term debt	$	367,762	$	(8,475)	$	359,287	$	316,250	$	(4,082)	$	312,168	$	316,250	$	(3,347)	$	312,903

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, 2023:

	Schedule of Contractual Maturities
(in thousands)	2029 Convertible Notes		2025 Convertible Notes		2024 Convertible Notes		Total
Remaining 2023	$	—	$	—	$	—	$	—
Fiscal 2024	—		—		34,389		34,389
Fiscal 2025	—		103,373		—		103,373
Fiscal 2026	—		—		—		—
Fiscal 2027	—		—		—		—
Thereafter	230,000		—		—		230,000
Total long-term debt	$	230,000	$	103,373	$	34,389	$	367,762

Schedule of Interest Income and Interest Expense Disclosure

The following table presents the Company's interest expense related to the Convertible Notes for the three and six months ended March 31, 2023 and 2022:

	Three Months Ended March 31,				Six Months Ended March 31,
(in thousands)	2023		2022		2023		2022
2029 Convertible Notes:
Contractual interest expense	$	2,156	$	—	$	2,587	$	—
Amortization of deferred financing costs	197		—		249		—
Total interest expense	$	2,353	$	—	$	2,836	$	—
2025 Convertible Notes:
Contractual interest expense	$	614	$	1,024	$	1,556	$	2,048
Amortization of deferred financing costs	120		182		308		389
Gain on extinguishment	—		—		(5,389)		—
Total interest expense	$	734	$	1,206	$	(3,525)	$	2,437
2024 Convertible Notes:
Contractual interest expense	$	247	$	1,033	$	1,123	$	2,066
Amortization of deferred financing costs	41		142		179		309
Loss on extinguishment	—		—		8,935		—
Total interest expense	$	288	$	1,175	$	10,237	$	2,375