Debt (Tables)

12 Months Ended

Sep. 30, 2025

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

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

	September 30, 2025						September 30, 2024
(in thousands)	Gross Amount		Debt Issuance Costs		Carrying Amount		Gross Amount		Debt Issuance Costs		Carrying Amount
2032 Senior Notes	$	300,000	$	(7,182)	$	292,818	$	—	$	—	$	—
2029 Convertible Notes	230,000		(4,742)		225,258		230,000		(5,744)		224,256
2025 Convertible Notes	—		—		—		103,373		(301)		103,072
Total	$	530,000	$	(11,924)	$	518,076	$	333,373	$	(6,045)	$	327,328
Less current portion	—		—		—		103,373		(301)		103,072
Total long-term debt	$	530,000	$	(11,924)	$	518,076	$	230,000	$	(5,744)	$	224,256

Schedule of Maturities of Debt

The following table presents the Company’s contractual maturities related to the debt instruments as of September 30, 2025

	Schedule of Contractual Maturities
(in thousands)	2029 Convertible Notes		2032 Senior Notes		Total
Fiscal 2026	$	—	$	—	$	—
Fiscal 2027	—		—		—
Fiscal 2028	—		—		—
Fiscal 2029	—		—		—
Fiscal 2030	230,000		—		230,000
Thereafter	—		300,000		300,000
Total long-term debt	$	230,000	$	300,000	$	530,000

Schedule of Interest Expense

The following table presents the Company’s interest expense related to the 2032 Senior Notes and the convertible notes:

	Fiscal Year Ended September 30,
(in thousands)	2025		2024		2023
2032 Senior Notes:
Contractual interest expense	$	11,247	$	—	$	—
Amortization of deferred financing costs	423		—		—
Total interest expense	$	11,670	$	—	$	—
2029 Convertible Notes:
Contractual interest expense	$	8,624	$	8,625	$	6,900
Amortization of deferred financing costs	1,002		972		742
Total interest expense	$	9,626	$	9,597	$	7,642
2025 Convertible Notes:
Contractual interest expense	$	1,432	$	2,455	$	2,779
Amortization of deferred financing costs	301		509		559
Gain on extinguishment	—		—		(5,389)
Total interest expense	$	1,733	$	2,964	$	(2,051)
2024 Convertible Notes:
Contractual interest expense	$	—	$	742	$	1,609
Amortization of deferred financing costs	—		124		260
Loss on extinguishment	—		—		8,935
Total interest expense	$	—	$	866	$	10,804