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PA Consulting Business Combination - Narrative (Details) - USD ($)
3 Months Ended
Mar. 02, 2021
Dec. 30, 2022
Dec. 31, 2021
Sep. 30, 2022
Business Acquisition [Line Items]        
Repurchase of redeemable noncontrolling interests   $ 58,353,000 $ 35,095,000  
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 $ 1,700,000,000      
Fair value of redeemable noncontrolling interests 582,400,000      
Goodwill recognized expected to be deductible for tax purposes $ 0      
Allocated share-based compensation expense   4,300,000 $ 200,000  
Cash in employee benefit trust   $ 2,300,000   $ 13,700,000
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