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Basis of Presentation - Additional Information (Details) $ in Millions |  |  | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 01, 2024 USD ($) bed | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) hospital state | Jun. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Jul. 01, 2023 bed
Class of Stock [Line Items] |  |  |  |  |  |
Number of states in which entity operates | state |  |  | 37 |  |  |
Number of inpatient rehabilitation hospitals operated | hospital |  |  | 163 |  |  |
Number of solely owned inpatient rehabilitation hospitals | hospital |  |  | 99 |  |  |
Number of jointly owned inpatient rehabilitation hospitals | hospital |  |  | 64 |  |  |
Contributions from noncontrolling interests of consolidated affiliates |  |  | $ 33.3 | $ 46.3 |  |
Hospital in Augusta, Georgia | Corporate Joint Venture | Subsequent Event |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of beds | bed | 70 |  |  |  |  |
Contributions from noncontrolling interests of consolidated affiliates | $ 90.0 |  |  |  |  |
Remaining noncontrolling interest | 50.00% |  |  |  |  |
Hospital in Augusta, Georgia | Corporate Joint Venture | Forecast |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Post-tax gain increasing capital in excess of par |  |  |  |  | $ 23.0 |
Hospital in Bowie, Maryland | Corporate Joint Venture |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Number of beds | bed |  |  |  |  |  | 60
Contributions from noncontrolling interests of consolidated affiliates |  | $ 26.3 |  |  |  |
Remaining noncontrolling interest |  |  |  |  |  | 50.00%
Minimum |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Joint venture ownership percentage |  |  | 50.00% |  |  |
Maximum |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Joint venture ownership percentage |  |  | 97.50% |  |  |

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