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DEBT (Tables) | 9 Months Ended
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Jun. 30, 2025
Debt Disclosure [Abstract] |
Schedule of Carrying Values of Company's 2026 Notes | The carrying values of the 0.75% convertible notes due 2026 issued by the Company in an initial aggregate principal amount of $155.3 million (the “2026 Notes”) are as follows (amounts in thousands):
2026 Notes: | June 30, 2025 |  | September 30, 2024
Principal amount | $ | 155,250 |  |  | $ | 155,250 |
Less: unamortized discount and issuance costs, net of amortization | (5,246) |  |  | (11,649) |
Carrying amount | $ | 150,004 |  |  | $ | 143,601 |
Schedule of Interest Costs Recognized Related to 2026 Notes | The following table presents the total amount of interest cost recognized relating to the 2026 Notes (amounts in thousands):
| Three Months Ended June 30, |  | Nine Months Ended June 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Contractual interest expense | $ | 290 |  |  | $ | 289 |  |  | $ | 871 |  |  | $ | 880 |
Amortization of debt discount and issuance costs | 2,179 |  |  | 2,040 |  |  | 6,403 |  |  | 6,015 |
Total interest expense recognized | $ | 2,469 |  |  | $ | 2,329 |  |  | $ | 7,274 |  |  | $ | 6,895 |

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