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Debt (Tables) | 12 Months Ended
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Sep. 30, 2024
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Instruments | The following table presents the Company’s debt instruments outstanding:
| September 30, 2024 |  | September 30, 2023
(in thousands) | Gross Amount |  | Debt Issuance Costs |  | Carrying Amount |  | Gross Amount |  | Debt Issuance Costs |  | Carrying Amount
2029 Convertible Notes | $ | 230,000 |  |  | $ | (5,744) |  |  | $ | 224,256 |  |  | $ | 230,000 |  |  | $ | (6,716) |  |  | $ | 223,284 |
2025 Convertible Notes | 103,373 |  |  | (301) |  |  | 103,072 |  |  | 103,373 |  |  | (810) |  |  | 102,563 |
2024 Convertible Notes | — |  |  | — |  |  | — |  |  | 34,389 |  |  | (124) |  |  | 34,265 |
Total | $ | 333,373 |  |  | $ | (6,045) |  |  | $ | 327,328 |  |  | $ | 367,762 |  |  | $ | (7,650) |  |  | $ | 360,112 |
Less current portion | 103,373 |  |  | (301) |  |  | 103,072 |  |  | 34,389 |  |  | (124) |  |  | 34,265 |
Total long-term debt | $ | 230,000 |  |  | $ | (5,744) |  |  | $ | 224,256 |  |  | $ | 333,373 |  |  | $ | (7,526) |  |  | $ | 325,847 |
Schedule of Maturities of Debt | The following table presents the Company’s contractual maturities related to the debt instruments as of September 30, 2024
| Schedule of Contractual Maturities
(in thousands) | 2029 Convertible Notes |  | 2025 Convertible Notes |  |  |  | Total
Fiscal 2025 | $ | — |  |  | $ | 103,373 |  |  |  |  | $ | 103,373 |
Fiscal 2026 | — |  |  | — |  |  |  |  | — |
Fiscal 2027 | — |  |  | — |  |  |  |  | — |
Fiscal 2028 | — |  |  | — |  |  |  |  | — |
Fiscal 2029 | — |  |  | — |  |  |  |  | — |
Thereafter | 230,000 |  |  | — |  |  |  |  | 230,000 |
Total long-term debt | $ | 230,000 |  |  | $ | 103,373 |  |  |  |  | $ | 333,373 |
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) | 2024 |  | 2023 |  | 2022
2029 Convertible Notes: |  |  |  |  |
Contractual interest expense | $ | 8,625 |  |  | $ | 6,900 |  |  | $ | — |
Amortization of deferred financing costs | 972 |  |  | 742 |  |  | — |
Total interest expense | $ | 9,597 |  |  | $ | 7,642 |  |  | $ | — |
2025 Convertible Notes: |  |  |  |  |
Contractual interest expense | $ | 2,455 |  |  | $ | 2,779 |  |  | $ | 4,097 |
Amortization of deferred financing costs | 509 |  |  | 559 |  |  | 797 |
Gain on extinguishment | — |  |  | (5,389) |  |  | — |
Total interest expense | $ | 2,964 |  |  | $ | (2,051) |  |  | $ | 4,894 |
2024 Convertible Notes: |  |  |  |  |
Contractual interest expense | $ | 742 |  |  | $ | 1,609 |  |  | $ | 4,133 |
Amortization of deferred financing costs | 124 |  |  | 260 |  |  | 635 |
Loss on extinguishment | — |  |  | 8,935 |  |  | — |
Total interest expense | $ | 866 |  |  | $ | 10,804 |  |  | $ | 4,768 |

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