Long-Term Debt - Narrative (Details) - USD ($) $ in Thousands	Jul. 26, 2024	Sep. 30, 2024	Jul. 11, 2024
Term loan
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 850,000
Interest rate of debt (as a percent)		7.10%
Debt instrument periodic payment principal percentage	0.25%
Principal outstanding		$ 850,000
Concentra Credit Facilities
Line of Credit Facility [Line Items]
Percentage of capital stock of foreign subsidiaries	65.00%
Percentage of net cash proceeds from issuance of debt obligations	100.00%
Concentra Credit Facilities | Total Net Leverage Ratio Greater Than 4.50 To 1.00
Line of Credit Facility [Line Items]
Percentage of net cash proceeds received	100.00%
Concentra Credit Facilities | Total Net Leverage Ratio Less Than 4.50 To 1.00
Line of Credit Facility [Line Items]
Percentage of net cash proceeds received	50.00%
Concentra Credit Facilities | Leverage Ratio Greater Than 4.50 To 1.00
Line of Credit Facility [Line Items]
Percentage prepaid	50.00%
Concentra Credit Facilities | Leverage Ratio Less Than 4.50 To 1.00
Line of Credit Facility [Line Items]
Percentage prepaid	25.00%
Concentra Credit Facilities | Minimum
Line of Credit Facility [Line Items]
Debt instrument, covenant, leverage ratio	4.00
Concentra Credit Facilities | Minimum | Total Net Leverage Ratio Greater Than 4.50 To 1.00
Line of Credit Facility [Line Items]
Debt instrument, total net leverage ratio	4.50
Concentra Credit Facilities | Minimum | Total Net Leverage Ratio Greater Than 4.00 To 1.00
Line of Credit Facility [Line Items]
Debt instrument, total net leverage ratio	4.00
Concentra Credit Facilities | Minimum | Leverage Ratio Greater Than 4.50 To 1.00
Line of Credit Facility [Line Items]
Debt instrument, covenant, leverage ratio	4.50
Concentra Credit Facilities | Maximum | Leverage Ratio Less Than 6.50 To 1.00
Line of Credit Facility [Line Items]
Debt instrument, covenant, leverage ratio	6.50
Concentra Credit Facilities | Maximum | Total Net Leverage Ratio Less Than 4.50 To 1.00
Line of Credit Facility [Line Items]
Debt instrument, total net leverage ratio	4.50
Concentra Credit Facilities | Maximum | Leverage Ratio Less Than 4.50 To 1.00
Line of Credit Facility [Line Items]
Debt instrument, covenant, leverage ratio	4.50
Concentra Credit Facilities | Maximum | Leverage Ratio Less Than 4.00 To 1.00
Line of Credit Facility [Line Items]
Debt instrument, covenant, leverage ratio	4.00
Concentra Credit Agreement | Term loan | Minimum | Term Secured Overnight Financing Rate
Line of Credit Facility [Line Items]
Credit spread adjustment	2.00%
Concentra Credit Agreement | Term loan | Minimum | Alternate Base Rate
Line of Credit Facility [Line Items]
Credit spread adjustment	1.00%
Concentra Credit Agreement | Term loan | Maximum | Term Secured Overnight Financing Rate
Line of Credit Facility [Line Items]
Credit spread adjustment	2.25%
Concentra Credit Agreement | Term loan | Maximum | Alternate Base Rate
Line of Credit Facility [Line Items]
Credit spread adjustment	1.25%
6.875% senior notes | Senior notes
Line of Credit Facility [Line Items]
Interest rate of debt (as a percent)		6.875%	6.875%
Principal outstanding		$ 650,000	$ 650,000
Revolving facility | Revolving facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 400,000
Revolving facility | Concentra Credit Agreement | Revolving facility | Minimum | Alternate Base Rate
Line of Credit Facility [Line Items]
Credit spread adjustment	1.25%
Revolving facility | Concentra Credit Agreement | Revolving facility | Maximum | Alternate Base Rate
Line of Credit Facility [Line Items]
Credit spread adjustment	1.75%
Revolving facility | Concentra Revolving Credit Facility | Revolving facility
Line of Credit Facility [Line Items]
Available borrowing capacity		386,400
Outstanding letters of credit		$ 13,600
Revolving facility | Concentra Revolving Credit Facility | Revolving facility | Minimum | Term Secured Overnight Financing Rate
Line of Credit Facility [Line Items]
Credit spread adjustment	2.25%
Revolving facility | Concentra Revolving Credit Facility | Revolving facility | Maximum | Term Secured Overnight Financing Rate
Line of Credit Facility [Line Items]
Credit spread adjustment	2.75%
Standby letters of credit | Revolving facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity	$ 75,000