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CONVERTIBLE SENIOR NOTES (Tables) | 9 Months Ended
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Jun. 30, 2023
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, 2023 |  | September 30, 2022
Principal amount | $ | 155,250 |  |  | $ | 155,250 |
Less: unamortized discount and issuance costs, net of amortization | (21,671) |  |  | (27,280) |
Carrying amount | $ | 133,579 |  |  | $ | 127,970 |
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,
| 2023 |  | 2022 |  | 2023 |  | 2022
Contractual interest expense | $ | 453 |  |  | $ | 290 |  |  | $ | 1,054 |  |  | $ | 886 |
Amortization of debt discount and issuance costs | 1,908 |  |  | 1,787 |  |  | 5,609 |  |  | 5,239 |
Total interest expense recognized | $ | 2,361 |  |  | $ | 2,077 |  |  | $ | 6,663 |  |  | $ | 6,125 |

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