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Debt - Schedule of Long-term Debt Obligations (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Sep. 30, 2024 | Feb. 13, 2020
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total debt |  | $ 1,547,500 | $ 1,752,625 |
Unamortized debt issuance costs for the senior notes | [1] | (3,509) | (4,053) |
Total debt, net of issuance costs | [2] | 1,543,991 | 1,748,572 |
4.000% Senior Notes Due 2028 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes |  |  |  | $ 500,000
3.625% Senior Notes Due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes |  |  |  | $ 500,000
Long-term Debt | Revolver Credit Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Payment to credit facility revolver | [3],[4] | 60,000 | 262,000 |
Long-term Debt | Secured Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Payment to credit facility revolver | [3],[4] | 487,500 | 490,625 |
Long-term Debt | 4.000% Senior Notes Due 2028 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes |  | 500,000 | 500,000 |
Long-term Debt | 3.625% Senior Notes Due 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes |  | $ 500,000 | $ 500,000 |
[1] | Of the unamortized debt issuance costs for the senior notes, $0.1 million was included in Current portion of long-term debt and $3.4 million was included in Long-term debt on t he Consolidated Balance Sheet as of December 31, 2024 and $0.4 million was included in Current portion of long-term debt and $3.6 million was included in Long-term debt o n the Consolidated Balance Sheet as of September 30, 2024.
[2] | As of December 31, 2024, $524.9 million of debt was classifie d as short term, including $499.9 million associated with the 2025 senior notes and related debt issuance costs and $25.0 million associated with the credit facility term loan. As of September 30, 2024, $521.5 million of debt was classified as short term, including $499.6 million associated with the 2025 senior notes and related debt issuance costs and $21.9 million associated with the credit facility term loan.
[3] | The stated maturity date under the credit facility on which both the revolver line and the term loan will mature and all amounts then outstanding will become due and payable is January 3, 2028. The term loan began amortizing in March 2024, with payment s of $18.8 million remaining in 2025, $25.0 million in 2026 and 2027, and $418.7 million in 2028.
[4] | Unamortized debt issuance costs related to the credit facility were $2.3 million included in Other current assets and $5.8 million included in Other assets on the Consolidated Balance Sheet as of December 31, 2024 and $2.3 million included in Other current assets and $5.2 million included in Other assets on the Consolidated Balance Sheet as of September 30, 2024.

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