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Convertible Senior Notes (Tables) | 6 Months Ended
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Mar. 31, 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: | March 31, 2023 |  | September 30, 2022
Principal amount | $ | 155,250 |  |  | $ | 155,250 |
Less: unamortized discount and issuance costs, net of amortization | (23,580) |  |  | (27,280) |
Carrying amount | $ | 131,670 |  |  | $ | 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 March 31, |  | Six Months Ended March 31,
| 2023 |  | 2022 |  | 2023 |  | 2022
Contractual interest expense | $ | 307 |  |  | $ | 293 |  |  | $ | 600 |  |  | $ | 595 |
Amortization of debt discount and issuance costs | 1,857 |  |  | 1,715 |  |  | 3,701 |  |  | 3,453 |
Total interest expense recognized | $ | 2,164 |  |  | $ | 2,008 |  |  | $ | 4,301 |  |  | $ | 4,048 |

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