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Senior Notes (Tables) | 9 Months Ended
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Jun. 30, 2021
Debt Disclosure [Abstract] |
Carrying Amounts and Fair Values of Senior Notes | The following table presents the face values and fair values for the Senior Notes at June 30, 2021 and September 30, 2020:
| June 30, 2021 |  | September 30, 2020
| Face Value (*) |  | Fair Value |  | Face Value (*) |  | Fair Value
| (In thousands)
The 2018 Senior Notes | 400,000 |  |  | 449,000 |  |  | 400,000 |  |  | 442,000 |
The 2019 Senior Notes | 350,000 |  |  | 359,625 |  |  | 350,000 |  |  | 358,750 |
Total | $ | 750,000 |  |  | $ | 808,625 |  |  | $ | 750,000 |  |  | $ | 800,750 |
(*) The carrying value of the Senior Notes was the face value reduced by the net debt issuance costs of $9.4 million and $10.6 million at June 30, 2021 and September 30, 2020, respectively.

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