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PA Consulting Business Combination - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 02, 2021
Sep. 30, 2022
Oct. 01, 2021
Oct. 02, 2020
Business Acquisition [Line Items]        
Preferred redeemable noncontrolling interests redemption value adjustment   $ 0 $ (57,307) $ 0
Preference share effect on basic earnings per share (in dollars per share)     $ 0.44  
Proceeds from issuances of redeemable noncontrolling interests   49,742 $ 0 $ 0
PA Consulting Employees        
Business Acquisition [Line Items]        
Ownership interest of employees 35.00%      
Proceeds from issuances of redeemable noncontrolling interests   49,700    
PA Consulting Group Limited        
Business Acquisition [Line Items]        
Percentage of outstanding shares of common and preferred stock acquired 65.00%      
Remaining percentage of outstanding shares of common and preferred stock acquired 35.00%      
Consideration transferred $ 1,700,000      
Consideration received from acquiree 261,000      
Redeemable noncontrolling interests had a fair value 582,400      
Goodwill recognized expected to be deductible for tax purposes $ 0      
Cash in employee benefit trust   13,700    
Allocated share-based compensation expense   $ 3,300 $ 400  
PA Consulting Group Limited | Customer Relationships, Contracts And Backlog And Trade names        
Business Acquisition [Line Items]        
Acquired finite-lived intangible assets, weighted average useful life 12 years      
PA Consulting Group Limited | Customer Relationships, Contracts And Backlog And Trade names | Minimum        
Business Acquisition [Line Items]        
Acquired finite-lived intangible assets, weighted average useful life 9 years      
PA Consulting Group Limited | Customer Relationships, Contracts And Backlog And Trade names | Maximum        
Business Acquisition [Line Items]        
Acquired finite-lived intangible assets, weighted average useful life 20 years