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Investments | 12 Months Ended
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Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract] |
Investments | INVESTMENTS 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 |
On September 30, 2023, the Company changed the classification of its investment securities from held-to-maturity to available-for-sale. This change enables the Company’s need to be able to respond to market and liquidity risks in managing its portfolio. Such investments are carried at fair value with any unrealized gains and losses reported as a component of other accumulated comprehensive loss. At the date of the transfer, the carrying value of the Company’s held-to-maturity securities was $295.7 million, and net unrealized losses of $3.0 million were recognized in accumulated other comprehensive loss. 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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