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Long-Term Debt - Narrative (Details)
$ in Millions
1 Months Ended
Feb. 28, 2025
Jul. 26, 2024
USD ($)
Mar. 31, 2025
USD ($)
Sep. 30, 2025
USD ($)
Term Loan        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity   $ 850.0    
Revolving Credit Facility | Concentra Credit Facilities        
Line of Credit Facility [Line Items]        
Debt instrument, covenant, leverage ratio   6.5    
Debt instrument, leverage ratio       3.6
Revolving Credit Facility | Term Loan | Concentra Term Loan        
Line of Credit Facility [Line Items]        
Increase in revolving credit facility     $ 102.1  
Credit spread adjustment 2.25%   2.00%  
Debt instrument, basis point step down     0.0025  
Debt instrument, covenant, leverage ratio     3.25  
Principal outstanding     $ 950.0  
Revolving Credit Facility | Revolving Credit Facility | Concentra Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity   $ 400.0 450.0  
Increase in revolving credit facility     $ 50.0  
Credit spread adjustment 2.50%   2.00%  
Debt instrument, basis point step down     0.0025  
Debt instrument, covenant, leverage ratio     3.50  
Available borrowing capacity       $ 393.0
Outstanding letters of credit       35.0
Revolving Credit Facility | Standby letters of credit        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity   $ 75.0    
Revolving Credit Facility | Letter of Credit | Concentra Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Outstanding letters of credit       $ 22.0