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Retirement Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net actuarial and settlement/curtailment (gain) loss | $ 0 | $ 0 | $ 0 | $ 8
Adjusted EBITDA |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net actuarial and settlement/curtailment (gain) loss |  |  |  | $ 8

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- Details
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