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Debt (Tables) | 6 Months Ended
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Mar. 31, 2026
Debt Disclosure [Abstract] |
Schedule of Long-term Debt Obligations | As of March 31, 2026 and September 30, 2025, we had the following debt obligations:
(in thousands) |  | March 31, 2026 |  |  | September 30, 2025 |
4.000% Senior notes due 2028 |  | $ | 500,000 |  |  | $ | 500,000 |
Credit facility revolver line(1)(2) |  |  | 243,750 |  |  |  | 231,250 |
Credit facility term loan(1)(2) |  |  | 456,250 |  |  |  | 468,750 |
Total debt |  |  | 1,200,000 |  |  |  | 1,200,000 |
Unamortized debt issuance costs for the senior notes(3) |  |  | (2,028 | ) |  |  | (2,566 | )
Total debt, net of issuance costs(4) |  | $ | 1,197,972 |  |  | $ | 1,197,434 |
(1) Unamortized debt issuance costs related to the credit facility were $2.7 million included in Other current assets and $2.9 million included in Other assets on the Consolidated Balance Sheet as of March 31, 2026 and $2.7 million included in Other current assets and $3.3 million included in Other assets on the Consolidated Balance Sheet as of September 30, 2025. (2) 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 payments remaining of $12.5 mi llion in 2026, $25.0 million in 2027, and $418.7 million in 2028. (3) As of March 31, 2026 and September 30, 2025, all unamortized debt issuance costs for the senior notes were included in Long-term debt on the Consolidated Balance Sheets. (4) As of March 31, 2026 and September 30, 2025, $25.0 million of debt associated with the credit facility term loan was classified as short 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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