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Stock-Based Compensation - Narrative (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Equity-based compensation | $ 31,000,000 | $ 34,000,000 | $ 29,000,000
Income tax benefit recognized for share-based compensation arrangements | $ 0 | $ 0 | $ 0
Restricted stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Unrecognized compensation related to unvested share arrangements | $ 19,000,000 |  |
Recognition period for unrecognized compensation cost | 1 year 10 months 24 days |  |
Performance shares (PSUs) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation related to unvested share arrangements | $ 8,000,000 |  |
Recognition period for unrecognized compensation cost | 1 year 10 months 24 days |  |
Performance period | 3 years |  |

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