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PA Consulting Business Combination - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 02, 2021
Sep. 29, 2023
Sep. 30, 2022
Oct. 01, 2021
Business Acquisition [Line Items]        
Repurchase of redeemable noncontrolling interests   $ 92,939 $ 46,074 $ 0
Proceeds from issuances of redeemable noncontrolling interests   34,016 49,742 0
Preferred redeemable noncontrolling interests redemption value adjustment   $ (8,340) 0 $ 57,307
Preference share effect on basic earnings per share (in dollars per share)   $ 0.07   $ 0.44
PA Consulting Employees        
Business Acquisition [Line Items]        
Proceeds from issuances of redeemable noncontrolling interests   $ 34,000 $ 49,700  
Ownership interest of employees 35.00% 69.00% 65.00%  
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      
Redeemable noncontrolling interests had a fair value 582,400      
Goodwill recognized expected to be deductible for tax purposes $ 0      
Business acquisitions pro forma income tax expense (benefit)       $ 330,700
Allocated share-based compensation expense   $ 800 $ 3,300  
Cash in employee benefit trust   $ 2,800 $ 13,700  
Remaining percentage of outstanding shares of common and preferred stock acquired 35.00%      
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 | Minimum | Customer Relationships, Contracts And Backlog And Trade names        
Business Acquisition [Line Items]        
Acquired finite-lived intangible assets, weighted average useful life 9 years      
PA Consulting Group Limited | Maximum | Customer Relationships, Contracts And Backlog And Trade names        
Business Acquisition [Line Items]        
Acquired finite-lived intangible assets, weighted average useful life 20 years