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PA Consulting Redeemable Noncontrolling Interests - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Mar. 29, 2024
Mar. 31, 2023
Mar. 29, 2024
Mar. 31, 2023
Sep. 29, 2023
Mar. 02, 2021
Business Acquisition [Line Items]            
Repurchase of redeemable noncontrolling interests     $ 24,360 $ 58,353    
Preferred redeemable noncontrolling interests redemption value adjustment $ 0 $ 0 $ 1,766 0    
Preference share effect on basic earnings per share (in dollars per share)     $ 0.01      
PA Consulting Employees            
Business Acquisition [Line Items]            
Ownership interest of employees 70.00%   70.00%   69.00%  
PA Consulting Group Limited            
Business Acquisition [Line Items]            
Percentage of outstanding shares of common and preferred stock acquired           65.00%
Allocated share-based compensation expense     $ 6,800 $ 1,100    
Cash in employee benefit trust $ 1,000   $ 1,000   $ 2,800