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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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