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Debt (Tables) | 12 Months Ended
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Sep. 30, 2021
Debt Disclosure [Abstract] |
Schedule of Long-term Borrowing Obligations | As of September 30, 2021 and 2020, we had the following long-term borrowing obligations:
(in thousands) |  | September 30, |
|  | 2021 |  |  | 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) |  |  | 450,000 |  |  |  | 18,000 |
Total debt |  |  | 1,450,000 |  |  |  | 1,018,000 |
Unamortized debt issuance costs for the senior notes(2) |  |  | (10,529 | ) |  |  | (12,686 | )
Total debt, net of issuance costs(3) |  | $ | 1,439,471 |  |  | $ | 1,005,314 |
(1) | Unamortized debt issuance costs related to the credit facility were $3.8 million and $4.9 million as of September 30, 2021 and 2020, 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 $10.5 million and $12.7 million as of September 30, 2021 and 2020, respectively, and were included in long-term debt on the Consolidated Balance Sheet.
(3) | As of September 30, 2021, and 2020, 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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