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Debt (Tables) | 9 Months Ended
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Jun. 30, 2023
Debt Disclosure [Abstract] |
Schedule of Long Term Debt Instruments | The following table presents the Company's debt instruments outstanding:
| June 30, 2023 |  | June 30, 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 |  |  | $ | (6,970) |  |  | $ | 223,030 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
2025 Convertible Notes | 103,373 |  |  | (940) |  |  | 102,433 |  |  | 172,500 |  |  | (2,383) |  |  | 170,117 |  |  | 172,500 |  |  | (2,172) |  |  | 170,328 |
2024 Convertible Notes | 34,389 |  |  | (166) |  |  | 34,223 |  |  | 143,750 |  |  | (1,346) |  |  | 142,404 |  |  | 143,750 |  |  | (1,175) |  |  | 142,575 |
Total long-term debt | $ | 367,762 |  |  | $ | (8,076) |  |  | $ | 359,686 |  |  | $ | 316,250 |  |  | $ | (3,729) |  |  | $ | 312,521 |  |  | $ | 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 June 30, 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 nine months ended June 30, 2023 and 2022:
| Three Months Ended June 30, |  | Nine Months Ended June 30,
(in thousands) | 2023 |  | 2022 |  | 2023 |  | 2022
2029 Convertible Notes: |  |  |  |  |  |  |
Contractual interest expense | $ | 2,157 |  |  | $ | — |  |  | $ | 4,744 |  |  | $ | — |
Amortization of deferred financing costs | 239 |  |  | — |  |  | 488 |  |  | — |
Total interest expense | $ | 2,396 |  |  | $ | — |  |  | $ | 5,232 |  |  | $ | — |
2025 Convertible Notes: |  |  |  |  |  |  |
Contractual interest expense | $ | 614 |  |  | $ | 1,025 |  |  | $ | 2,170 |  |  | $ | 3,073 |
Amortization of deferred financing costs | 121 |  |  | 197 |  |  | 429 |  |  | 586 |
Gain on extinguishment | — |  |  | — |  |  | (5,389) |  |  | — |
Total interest expense | $ | 735 |  |  | $ | 1,222 |  |  | $ | (2,790) |  |  | $ | 3,659 |
2024 Convertible Notes: |  |  |  |  |  |  |
Contractual interest expense | $ | 247 |  |  | $ | 1,033 |  |  | $ | 1,370 |  |  | $ | 3,099 |
Amortization of deferred financing costs | 39 |  |  | 156 |  |  | 218 |  |  | 465 |
Loss on extinguishment | — |  |  | — |  |  | 8,935 |  |  | — |
Total interest expense | $ | 286 |  |  | $ | 1,189 |  |  | $ | 10,523 |  |  | $ | 3,564 |

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