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Debt (Tables) | 9 Months Ended
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Jun. 30, 2025
Debt Disclosure [Abstract] |
Schedule of Long Term Debt Instruments | The following table presents the Company's debt instruments outstanding:
| June 30, 2025 |  | June 30, 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 |  |  | $ | (7,381) |  |  | $ | 292,619 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
2029 Convertible Notes | 230,000 |  |  | (5,018) |  |  | 224,982 |  |  | 230,000 |  |  | (6,002) |  |  | 223,998 |  |  | 230,000 |  |  | (5,744) |  |  | 224,256 |
2025 Convertible Notes | — |  |  | — |  |  | — |  |  | 103,373 |  |  | (433) |  |  | 102,940 |  |  | 103,373 |  |  | (301) |  |  | 103,072 |
2024 Convertible Notes | — |  |  | — |  |  | — |  |  | 34,389 |  |  | (3) |  |  | 34,386 |  |  | — |  |  | — |  |  | — |
Total | $ | 530,000 |  |  | $ | (12,399) |  |  | $ | 517,601 |  |  | $ | 367,762 |  |  | $ | (6,438) |  |  | $ | 361,324 |  |  | $ | 333,373 |  |  | $ | (6,045) |  |  | $ | 327,328 |
Less current portion | — |  |  | — |  |  | — |  |  | 137,762 |  |  | (436) |  |  | 137,326 |  |  | 103,373 |  |  | (301) |  |  | 103,072 |
Total long-term debt | $ | 530,000 |  |  | $ | (12,399) |  |  | $ | 517,601 |  |  | $ | 230,000 |  |  | $ | (6,002) |  |  | $ | 223,998 |  |  | $ | 230,000 |  |  | $ | (5,744) |  |  | $ | 224,256 |
Schedule of Interest Expense | The following table presents the Company’s interest expense related to its debt for the three and nine months ended June 30, 2025 and 2024:
|  |  | Three Months Ended June 30, |  | Nine Months Ended June 30,
(in thousands) |  |  |  |  | 2025 |  | 2024 |  | 2025 |  | 2024
2032 Senior Notes: |  |  |  |  |  |  |  |  |  |  |
Contractual interest expense |  |  |  |  | $ | 5,532 |  |  | $ | — |  |  | $ | 5,716 |  |  | $ | — |
Amortization of deferred financing costs |  |  |  |  | 205 |  |  | — |  |  | 212 |  |  | — |
Total interest expense |  |  |  |  | $ | 5,737 |  |  | $ | — |  |  | $ | 5,928 |  |  | $ | — |
2029 Convertible Notes: |  |  |  |  |  |  |  |  |  |  |
Contractual interest expense |  |  |  |  | $ | 2,156 |  |  | $ | 2,156 |  |  | $ | 6,469 |  |  | $ | 6,469 |
Amortization of deferred financing costs |  |  |  |  | 260 |  |  | 242 |  |  | 726 |  |  | 714 |
Total interest expense |  |  |  |  | $ | 2,416 |  |  | $ | 2,398 |  |  | $ | 7,195 |  |  | $ | 7,183 |
2025 Convertible Notes: |  |  |  |  |  |  |  |  |  |  |
Contractual interest expense |  |  |  |  | $ | 204 |  |  | $ | 613 |  |  | $ | 1,432 |  |  | $ | 1,841 |
Amortization of deferred financing costs |  |  |  |  | 49 |  |  | 123 |  |  | 301 |  |  | 377 |
Total interest expense |  |  |  |  | $ | 253 |  |  | $ | 736 |  |  | $ | 1,733 |  |  | $ | 2,218 |
2024 Convertible Notes: |  |  |  |  |  |  |  |  |  |  |
Contractual interest expense |  |  |  |  | $ | — |  |  | $ | 248 |  |  | $ | — |  |  | $ | 742 |
Amortization of deferred financing costs |  |  |  |  | — |  |  | 40 |  |  | — |  |  | 121 |
Total interest expense |  |  |  |  | $ | — |  |  | $ | 288 |  |  | $ | — |  |  | $ | 863 |

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