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DEBT (Tables) | 6 Months Ended
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Mar. 31, 2022
Debt Disclosure [Abstract] |
Schedule of Components of Unsecured Long-Term Debt Outstanding | We had the following unsecured long-term debt outstanding with maturities shown in the following table:
| March 31, 2022 |  | September 30, 2021
(in thousands) | Face Amount |  | Unamortized Discount and Debt Issuance Cost |  | Book Value |  | Face Amount |  | Unamortized Discount and Debt Issuance Cost |  | Book Value
Unsecured senior notes: |  |  |  |  |  |  |  |  |  |  |
Due March 19, 2025 | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 487,148 |  |  | $ | (3,662) |  |  | $ | 483,486 |
Due September 29, 2031 | 550,000 |  |  | (8,031) |  |  | 541,969 |  |  | 550,000 |  |  | (8,003) |  |  | 541,997 |
| 550,000 |  |  | (8,031) |  |  | 541,969 |  |  | 1,037,148 |  |  | (11,665) |  |  | 1,025,483 |
Less long-term debt due within one year | — |  |  | — |  |  | — |  |  | (487,148) |  |  | 3,662 |  |  | (483,486) |
Long-term debt | $ | 550,000 |  |  | $ | (8,031) |  |  | $ | 541,969 |  |  | $ | 550,000 |  |  | $ | (8,003) |  |  | $ | 541,997 |

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