Debt (Tables)

12 Months Ended

Sep. 30, 2023

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

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

	September 30, 2023						September 30, 2022
(in thousands)	Gross Amount		Debt Issuance Costs		Carrying Amount		Gross Amount		Debt Issuance Costs		Carrying Amount
2029 Convertible Notes	$	230,000	$	(6,716)	$	223,284	$	—	$	—	$	—
2025 Convertible Notes	103,373		(810)		102,563		172,500		(2,172)		170,328
2024 Convertible Notes	34,389		(124)		34,265		143,750		(1,175)		142,575
Total	$	367,762	$	(7,650)	$	360,112	$	316,250	$	(3,347)	$	312,903
Less current portion	34,389		(124)		34,265		—		—		—
Total long-term debt	$	333,373	$	(7,526)	$	325,847	$	316,250	$	(3,347)	$	312,903

Schedule of Maturities of Debt

The following table presents the Company’s contractual maturities related to the debt instruments as of September 30, 2023

	Schedule of Contractual Maturities
(in thousands)	2029 Convertible Notes		2025 Convertible Notes		2024 Convertible Notes		Total
Fiscal 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:

	Fiscal Year Ended September 30,
(in thousands)	2023		2022		2021
2029 Convertible Notes:
Contractual interest expense	$	6,900	$	—	$	—
Amortization of deferred financing costs	742		—		—
Total interest expense	$	7,642	$	—	$	—
2025 Convertible Notes:
Contractual interest expense	$	2,779	$	4,097	$	4,097
Amortization of deferred financing costs	559		797		560
Amortization of debt discount	—		—		6,919
Gain on extinguishment	(5,389)		—		—
Total interest expense	$	(2,051)	$	4,894	$	11,576
2024 Convertible Notes:
Contractual interest expense	$	1,609	$	4,133	$	4,133
Amortization of deferred financing costs	260		635		446
Amortization of debt discount	—		—		5,903
Loss on extinguishment	8,935		—		—
Total interest expense	$	10,804	$	4,768	$	10,482