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Basis of Presentation (Details) - USD ($)
shares in Millions
3 Months Ended
Feb. 04, 2022
Nov. 19, 2021
Mar. 02, 2021
Nov. 24, 2020
Apr. 26, 2019
Apr. 01, 2022
Oct. 01, 2021
Worley Stock              
Business Acquisition [Line Items]              
Ordinary shares included in purchase price (in shares)         58.2    
Worley              
Business Acquisition [Line Items]              
Consideration paid in cash         $ 2,800,000,000    
Consideration transferred         $ 3,400,000,000    
Discontinued Operations | Worley              
Business Acquisition [Line Items]              
Assets held for sale             $ 0
PA Consulting Employees              
Business Acquisition [Line Items]              
Ownership interest of employees     35.00%        
StreetLightData, Inc.              
Business Acquisition [Line Items]              
Consideration paid in cash $ 190,800,000            
Business combination consideration equity issued 900,000            
In-the-money stock options transferred 5,200,000            
Debt assumed $ 1,000,000.0            
BlackLynx              
Business Acquisition [Line Items]              
Consideration paid in cash   $ 235,400,000          
Debt assumed   $ 5,300,000          
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        
Consideration received from acquiree     261,000,000     $ 267,000,000  
Redeemable Noncontrolling interests     $ 582,400,000        
Buffalo Group              
Business Acquisition [Line Items]              
Consideration paid in cash       $ 182,400,000      
Debt assumed       7,700,000      
Consideration transferred       190,100,000      
Contingent consideration       $ 7,700,000