v3.26.1
PA Consulting Redeemable Noncontrolling Interests - Narrative (Details)
$ / shares in Units, $ in Thousands, £ in Millions
3 Months Ended 9 Months Ended 53 Months Ended
Mar. 20, 2026
USD ($)
Jan. 02, 2026
GBP (£)
shares
Mar. 27, 2026
USD ($)
Jun. 27, 2025
USD ($)
Jun. 26, 2026
USD ($)
$ / shares
shares
Jun. 27, 2025
USD ($)
$ / shares
Jul. 31, 2025
Jan. 02, 2026
$ / shares
shares
Sep. 26, 2025
USD ($)
$ / shares
shares
Sep. 27, 2024
$ / shares
Business Combination [Line Items]                    
Common stock, par value (in dollars per share) | $ / shares         $ 1       $ 1 $ 1.00
Common stock, issued (in shares) | shares         117,132,889       119,081,294  
Redemption of redeemable noncontrolling interests relating to the PA Consulting Transaction         $ (917,591) $ (8,472)        
Preference share effect on basic earnings per share (in dollars per share) | $ / shares         $ 0.11 $ 0.10        
Allocated share-based compensation expense       $ 6,800   $ 20,700        
Equity-Based Incentive Grants                    
Business Combination [Line Items]                    
Accrued cumulative expense associated with the vested grants                 $ 103,800  
Allocated share-based compensation expense         $ 237,500 20,600        
Equity-Based Incentive Grants | Share-Based Payment Arrangement, Tranche One                    
Business Combination [Line Items]                    
Award vesting percentage             40.00%      
Equity-Based Incentive Grants | Share-Based Payment Arrangement, Tranche Two                    
Business Combination [Line Items]                    
Award vesting percentage 60.00%                  
PA Consulting                    
Business Combination [Line Items]                    
Redemption of redeemable noncontrolling interests relating to the PA Consulting Transaction     $ (400)     $ (8,500)        
PA Consulting Employees                    
Business Combination [Line Items]                    
Redemption of redeemable noncontrolling interests relating to the PA Consulting Transaction         $ (1,119,417)          
Ownership interest of employees (as a percent)                 71.00%  
PA Consulting Group Limited                    
Business Combination [Line Items]                    
Consideration transferred | £   £ 1,210.0                
Consideration paid in cash | £   £ 997.6                
Business combination share issued (in shares) | shares   2,043,537                
Common stock, par value (in dollars per share) | $ / shares               $ 1.00    
Business combination, additional consideration deferred, estimated equity value | £   £ 75.0                
Common stock, issued (in shares) | shares         2,043,537     2,043,537    
Initial consideration distributed in cash $ 113,500                  
Business combination, additional deferred consideration payable to acquiree employees         $ 10,400          
Cash in employee benefit trust         $ 16,100       $ 1,400