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Debt (Tables) | 3 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Obligations | At December 31, 2020 and September 30, 2020, we had the following long-term debt obligations:
(in thousands) |  | December 31, 2020 |  |  | September 30, 2020 |
4.000% Senior notes due 2028 |  | $ | 500,000 |  |  | $ | 500,000 |
3.625% Senior notes due 2025 |  |  | 500,000 |  |  |  | 500,000 |
Credit facility revolver(1) |  |  | — |  |  |  | 18,000 |
Total debt |  |  | 1,000,000 |  |  |  | 1,018,000 |
Unamortized debt issuance costs for the senior notes(2) |  |  | (12,143 | ) |  |  | (12,686 | )
Total debt, net of issuance costs |  | $ | 987,857 |  |  | $ | 1,005,314 |
(1) | Unamortized debt issuance costs related to the credit facility were $4.6 million and $4.9 million as of December 31, 2020 and September 30, 2020, respectively, and are included in other assets on the Consolidated Balance Sheets.
(2) | Unamortized debt issuance costs are included in long-term debt on the Consolidated Balance Sheets.

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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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