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Debt (Tables) | 6 Months Ended
--- | ---
Mar. 31, 2018
Debt |
Schedule of components of unsecured long-term debt outstanding |
|  |  |  |  |  |  |  | Unamortized Discount and |
|  | Principal |  | Debt Issuance Costs |
|  | March 31, |  | September 30, |  | March 31, |  | September 30, |
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |
|  | (in thousands) |
Unsecured senior notes issued March 19, 2015: |  |  |  |  |  |  |  |  |  |  |  |  |
Due March 19, 2025 |  | $ | 500,000 |  | $ | 500,000 |  | $ | (6,567) |  | $ | (7,098) |
|  |  | 500,000 |  |  | 500,000 |  |  | (6,567) |  |  | (7,098) |
Less long-term debt due within one year |  |  | — |  |  | — |  |  | — |  |  | — |
Long-term debt |  | $ | 500,000 |  | $ | 500,000 |  | $ | (6,567) |  | $ | (7,098) |

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