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Debt Debt (Tables) | 6 Months Ended
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Mar. 31, 2018
Debt Disclosure [Abstract] |
Schedule of Debt | At March 31, 2018 and September 30, 2017, we had the following long-term debt obligations:
| March 31, 2018 |  | September 30, 2017
| (in thousands)
6.000% Senior notes due 2024 | $ | 500,000 |  |  | $ | 500,000 |
Credit facility revolver | 148,125 |  |  | 218,125 |
Total debt | 648,125 |  |  | 718,125 |
Unamortized debt issuance costs for the Senior notes (1) | (5,288 | ) |  | (5,719 | )
Total debt, net of issuance costs (2) | $ | 642,837 |  |  | $ | 712,406 |
(1) Unamortized debt issuance costs related to the credit facility were $1.5 million and $2.0 million as of March 31, 2018 and September 30, 2017, respectively, and were included in other assets.
(2) As of March 31, 2018 and September 30, 2017 all debt was included in long-term debt.

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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