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Senior Notes (Tables) | 12 Months Ended
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Sep. 30, 2020
Debt Disclosure [Abstract] |
Senior Notes | The 2010 Senior Notes were issued in four series as follows:
Series | Amount | Interest Rate | Maturity Date
| (In millions) |  |
E | $ | 60.0 |  | 4.72 | % | July 14, 2016
F | $ | 72.0 |  | 5.04 | % | July 14, 2017
G | $ | 28.0 |  | 5.42 | % | July 14, 2019
H | $ | 85.0 |  | 5.59 | % | July 14, 2020
Principal Amounts Carrying amounts and Fair Values of Senior Notes | The following table presents the carrying amounts and fair values for the Senior Notes at September 30, 2020 and 2019:
| September 30, 2020 |  | September 30, 2019
| Face Value (*) |  | Fair Value |  | Face Value (*) |  | Fair Value
| (In thousands)
The 2010 Senior Notes | $ | — |  |  | $ | — |  |  | $ | 85,000 |  |  | $ | 86,121 |
The 2018 Senior Notes | 400,000 |  |  | 442,000 |  |  | 400,000 |  |  | 428,000 |
The 2019 Senior Notes | 350,000 |  |  | 358,750 |  |  | — |  |  | — |
Total | $ | 750,000 |  |  | $ | 800,750 |  |  | $ | 485,000 |  |  | $ | 514,121 |
(*) The carrying value of the Senior Notes was reduced by the net debt issuance costs of $10.6 million and $5.2 million at September 30, 2020 and 2019, respectively.
Future Principal Payments For the Senior Notes | Future principal payments for the Senior Notes are as follows (in thousands):
Year Ending September 30, |
2021 | $ | — |
2022 | — |
2023 | — |
2024 | — |
2025 | — |
Thereafter | 750,000 |
Total | $ | 750,000 |

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