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Commitments and Contingencies - Legal Proceedings (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 24, 2021
USD ($)
Dec. 19, 2016
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
plaintiff
Sep. 30, 2020
USD ($)
Commitments And Contingencies [Line Items]            
Gain (loss) related to legal settlement     $ 0 $ 0 $ (30,468) $ 0
Baldino Group            
Commitments And Contingencies [Line Items]            
Number of plaintiffs | plaintiff         2  
CBIZ Operations and a former employee of CBIZ MMP            
Commitments And Contingencies [Line Items]            
Total transaction price   $ 200,000        
CBIZ Operations and a former employee of CBIZ MMP | Maximum            
Commitments And Contingencies [Line Items]            
Damages sought amount   $ 177,000        
University of Pittsburgh Medical Center            
Commitments And Contingencies [Line Items]            
Settlement amount awarded to other party $ 41,500          
Gain (loss) related to legal settlement $ (30,500)