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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] | Amortization of intangible assets | Amortization of intangible assets | Amortization of intangible assets
U.S. Services and Outside the U.S. Services |  |  |
Fair Value Disclosure, Asset and Liability, Not Measured at Fair Value [Line Items] |  |  |
Impairment of long-lived assets held-for-use | $ 9.5 | $ 0.0 | $ 12.5

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