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Investments (Tables) | 3 Months Ended
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Dec. 31, 2024
Investments, Debt and Equity Securities [Abstract] |
Schedule of Short-term and Long-term Investments and Marketable Securities | The Company’s investments consisted of the following:
| As of December 31, 2024
| (in thousands)
| Adjusted Basis |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-sale securities | $ | 498,743 |  |  | $ | 387 |  |  | $ | (84) |  |  | $ | 499,046 |
Total current investments | $ | 498,743 |  |  | $ | 387 |  |  | $ | (84) |  |  | $ | 499,046 |
| As of September 30, 2024
| (in thousands)
| Adjusted Basis |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-sale securities | $ | 577,465 |  |  | $ | 837 |  |  | $ | (26) |  |  | $ | 578,276 |
Total current investments | $ | 577,465 |  |  | $ | 837 |  |  | $ | (26) |  |  | $ | 578,276 |
Schedule of Contract Maturity of Available for Sale Securities | The following table summarizes the contract maturity of the available-for-sale securities as of:
| December 31, 2024 |  | September 30, 2024
| (in thousands)
Within one year | $ | 474,459 |  |  | $ | 578,276 |
After one to two years | 24,587 |  |  | — |
Total | $ | 499,046 |  |  | $ | 578,276 |

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