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Investments (Tables) | 12 Months Ended
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Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract] |
Summary of Short-term, Long-term Investments and Marketable Securities | The Company’s investments consisted of the following:
| As of September 30, 2023
| (in thousands)
| Adjusted Basis |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Available-for-sale debt securities | $ | 295,699 |  |  | $ | — |  |  | $ | (2,964) |  |  | $ | 292,735 |
Total current investments | $ | 295,699 |  |  | $ | — |  |  | $ | (2,964) |  |  | $ | 292,735 |
The Company does not believe that the available-for-sale debt securities that were in an unrealized loss position have any credit loss impairment as of September 30, 2023.
| As of September 30, 2022
| (in thousands)
| Adjusted Basis |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Short-term investments (due within one year) |  |  |  |  |  |  |
Held-to-maturity debt securities | $ | 218,391 |  |  | $ | — |  |  | $ | (3,661) |  |  | $ | 214,730 |
Held-to-maturity certificate of deposit | 50,000 |  |  | — |  |  | — |  |  | 50,000 |
Total current investments | $ | 268,391 |  |  | $ | — |  |  | $ | (3,661) |  |  | $ | 264,730 |
Long-term investments (Due within one through three years) |  |  |  |  |  |  |
Held-to-maturity debt securities | $ | 105,872 |  |  | $ | — |  |  | $ | (5,569) |  |  | $ | 100,303 |
Total long-term investments | $ | 105,872 |  |  | $ | — |  |  | $ | (5,569) |  |  | $ | 100,303 |

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