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Description of Business and Basis of Presentation - Basis of Presentation, Acquisition Narrative (Details)
shares in Millions
3 Months Ended 12 Months Ended
Feb. 04, 2022
USD ($)
Nov. 19, 2021
USD ($)
Mar. 02, 2021
USD ($)
Nov. 24, 2020
USD ($)
Apr. 26, 2019
USD ($)
shares
Dec. 30, 2022
operating_segment
Sep. 29, 2023
USD ($)
operating_segment
Sep. 30, 2022
Business Acquisition [Line Items]                
Number of operating segments | operating_segment           4 4  
PA Consulting Employees                
Business Acquisition [Line Items]                
Ownership interest of employees     35.00%       69.00% 65.00%
Worley Stock                
Business Acquisition [Line Items]                
Equity instrument consideration, shares | shares         58.2      
ECR Business                
Business Acquisition [Line Items]                
Business combination consideration paid in cash         $ 2,800,000,000      
Consideration transferred         $ 3,400,000,000      
ECR Business | Discontinued Operations                
Business Acquisition [Line Items]                
Assets held for sale             $ 0  
StreetLightData, Inc.                
Business Acquisition [Line Items]                
Business combination consideration paid in cash $ 190,800,000              
Business combination consideration equity issued 900,000              
Money stock options 5,200,000              
Transferred liabilities incurred $ 1,000,000              
BlackLynx                
Business Acquisition [Line Items]                
Business combination consideration paid in cash   $ 235,400,000            
Transferred liabilities incurred   5,300,000            
Business combination, recognized identifiable assets acquired and liabilities assumed, noncurrent liabilities, long-term debt   $ 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          
Redeemable noncontrolling interests had a fair value     $ 582,400,000          
Buffalo Group                
Business Acquisition [Line Items]                
Business combination consideration paid in cash       $ 182,400,000        
Business combination, recognized identifiable assets acquired and liabilities assumed, noncurrent liabilities, long-term debt       7,700,000        
Consideration transferred       190,100,000        
Contingent consideration       $ 7,700,000