Debt (Tables)

6 Months Ended

Mar. 31, 2025

Debt Disclosure [Abstract]

Schedule of Long Term Debt Instruments

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

	March 31, 2025						March 31, 2024						September 30, 2024
(in thousands)	Gross Amount		Deferred Financing Costs		Carrying Amount		Gross Amount		Deferred Financing Costs		Carrying Amount		Gross Amount		Deferred Financing Costs		Carrying Amount
2032 Senior Notes	$	300,000	$	(7,535)	$	292,465	$	—	$	—	$	—	$	—	$	—	$	—
2029 Convertible Notes	230,000		(5,277)		224,723		230,000		(6,244)		223,756		230,000		(5,744)		224,256
2025 Convertible Notes	103,373		(48)		103,325		103,373		(556)		102,817		103,373		(301)		103,072
2024 Convertible Notes	—		—		—		34,389		(42)		34,347		—		—		—
Total	$	633,373	$	(12,860)	$	620,513	$	367,762	$	(6,842)	$	360,920	$	333,373	$	(6,045)	$	327,328
Less current portion	103,373		(48)		103,325		34,389		(42)		34,347		103,373		(301)		103,072
Total long-term debt	$	530,000	$	(12,812)	$	517,188	$	333,373	$	(6,800)	$	326,573	$	230,000	$	(5,744)	$	224,256

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, 2025:

	Schedule of Contractual Maturities
(in thousands)	2032 Senior Notes		2029 Convertible Notes		2025 Convertible Notes		Total
Remaining 2025	$	—	$	—	$	103,373	$	103,373
Fiscal 2026	—		—		—		—
Fiscal 2027	—		—		—		—
Fiscal 2028	—		—		—		—
Fiscal 2029	—		—		—		—
Thereafter	300,000		230,000		—		530,000
Total long-term debt	$	300,000	$	230,000	$	103,373	$	633,373

Schedule of Interest Expense

The following table presents the Company’s interest expense related to it’s debt for the three and six months ended March 31, 2025 and 2024:

	Three Months Ended March 31,				Six Months Ended March 31,
(in thousands)	2025		2024		2025		2024
2032 Senior Notes:
Contractual interest expense	$	184	$	—	$	184	$	—
Amortization of deferred financing costs	7		—		7		—
Total interest expense	$	191	$	—	$	191	$	—
2029 Convertible Notes:
Contractual interest expense	$	2,157	$	2,157	$	4,313	$	4,313
Amortization of deferred financing costs	217		228		466		472
Total interest expense	$	2,374	$	2,385	$	4,779	$	4,785
2025 Convertible Notes:
Contractual interest expense	$	614	$	614	$	1,228	$	1,228
Amortization of deferred financing costs	119		123		252		254
Total interest expense	$	733	$	737	$	1,480	$	1,482
2024 Convertible Notes:
Contractual interest expense	$	—	$	247	$	—	$	494
Amortization of deferred financing costs	—		39		—		81
Total interest expense	$	—	$	286	$	—	$	575