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Debt (Tables) | 12 Months Ended
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Sep. 30, 2020
Debt Disclosure [Abstract] |
Schedule of Long-term Borrowing Obligations | As of September 30, 2020 and 2019, we had the following long-term borrowing obligations:
(in thousands) |  | September 30, |
|  | 2020 |  |  | 2019 |
4.000% Senior notes due 2028 |  | $ | 500,000 |  |  | $ | — |
3.625% Senior notes due 2025 |  |  | 500,000 |  |  |  | — |
6.000% Senior notes due 2024 |  |  | — |  |  |  | 500,000 |
Credit facility revolver(1) |  |  | 18,000 |  |  |  | 173,125 |
Total debt |  |  | 1,018,000 |  |  |  | 673,125 |
Unamortized debt issuance costs for the Senior notes(2) |  |  | (12,686 | ) |  |  | (3,991 | )
Total debt, net of issuance costs(3) |  | $ | 1,005,314 |  |  | $ | 669,134 |
(1) | Unamortized debt issuance costs related to the credit facility were $4.9 million and $3.1 million as of September 30, 2020 and 2019, respectively, and were included in other assets on the Consolidated Balance Sheets.
(2) | Of the $14.1 million in financing costs incurred in connection with the issuance of the 2028 and 2025 notes, unamortized debt issuance costs were $12.7 million as of September 30, 2020 and were included in long-term debt on the Consolidated Balance Sheet. Unamortized debt issuance costs as of September 30, 2019 related to the 2024 notes and were included in long-term debt on the Consolidated Balance Sheet.
(3) | As of September 30, 2020 and 2019, all debt was classified as long term.

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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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