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Fair Value Measurements (Tables) | 6 Months Ended
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Mar. 31, 2019
Fair Value Disclosures [Abstract] |
Carrying Value and Estimated Fair Value of Long-term Debt, Including Current Maturities | The carrying value and estimated fair value of the Company's long-term debt, including current maturities, were as follows (in thousands):
|  | March 31, 2019 |  |  | September 30, 2018 |
|  | Carrying |  |  | Fair |  |  | Carrying |  |  | Fair |
|  | Value |  |  | Value |  |  | Value |  |  | Value |
Long-term debt, including current maturities(1) |  | $ | 857,841 |  |  | $ | 864,609 |  |  | $ | 930,207 |  |  | $ | 926,229 |
(1) | Current and prior period long-term debts' carrying and fair values exclude net debt issuance costs.

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