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Senior Notes (Tables) | 12 Months Ended
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Sep. 30, 2023
Debt Disclosure [Abstract] |
Principal Amounts Carrying amounts and Fair Values of Senior Notes | The following table presents the face values and fair values for the Senior Notes at September 30, 2023 and 2022:
| September 30, 2023 |  | September 30, 2022
| Face Value (*) |  | Fair Value |  | Face Value (*) |  | Fair Value
| (In thousands)
The 2018 Senior Notes | $ | 400,000 |  |  | $ | 386,000 |  |  | $ | 400,000 |  |  | $ | 381,500 |
The 2019 Senior Notes and the 2021 Senior Notes | 900,000 |  |  | 803,250 |  |  | 900,000 |  |  | 767,250 |
Total | $ | 1,300,000 |  |  | $ | 1,189,250 |  |  | $ | 1,300,000 |  |  | $ | 1,148,750 |
(*) The carrying value of the Senior Notes was the face value reduced by the net debt issuance costs of $11.5 million and $14.3 million at September 30, 2023 and 2022, respectively.
Future Principal Payments For the Senior Notes | Future principal payments for the term loan are as follows:
Year Ending September 30, | (In thousands)
2024 | $ | 15,000 |
2025 | 15,000 |
2026 | 243,750 |
Total | $ | 273,750 |
Future principal payments for the Senior Notes are as follows:
Year Ending September 30, | (In thousands)
2026 | 400,000 |
2027 | — |
2028 | 900,000 |
Total | $ | 1,300,000 |

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