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PA Consulting Business Combination - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 02, 2021
Dec. 31, 2021
Jan. 01, 2021
Business Acquisition [Line Items]      
Repurchase of redeemable noncontrolling interests   $ (35,095) $ 0
PA Consulting Employees      
Business Acquisition [Line Items]      
Ownership interest of employees 35.00%    
PA Consulting Group Limited      
Business Acquisition [Line Items]      
Percentage of outstanding shares of common and preferred stock acquired 65.00%    
Consideration transferred $ 1,700,000    
Consideration received from acquiree 261,000    
Redeemable Noncontrolling interests $ 582,400    
Cash in employee benefit trust   $ 700  
PA Consulting Group Limited | Customer Relationships, Contracts And Backlog And Trade names      
Business Acquisition [Line Items]      
Useful life of acquired intangible assets 12 years    
PA Consulting Group Limited | Customer Relationships, Contracts And Backlog And Trade names | Minimum      
Business Acquisition [Line Items]      
Useful life of acquired intangible assets 9 years    
PA Consulting Group Limited | Customer Relationships, Contracts And Backlog And Trade names | Maximum      
Business Acquisition [Line Items]      
Useful life of acquired intangible assets 20 years