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Debt - Effective Interest Rate (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Debt Disclosure [Abstract] |  |  |
Effective interest rate (as percent) | 5.10% | 5.60% | 5.30%
Amortization of deferred debt issuance costs | $ 7.4 | $ 7.6 | $ 4.9

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