v3.26.3
Acquisitions - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 14, 2026
Oct. 01, 2025
Jun. 30, 2025
Jan. 31, 2025
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Jun. 30, 2026
Business Acquisition [Line Items]                    
Amortization of intangible assets         $ 21,500,000 $ 18,000,000 $ 69,000,000 $ 51,400,000    
Revenues         1,650,548,000 1,621,748,000 4,717,591,000 4,760,431,000    
Goodwill         2,421,589,000   2,421,589,000   $ 2,186,650,000  
Paid in 18 months                    
Business Acquisition [Line Items]                    
Cash paid to acquire       $ 3,800,000            
Altamira Technologies Corporation                    
Business Acquisition [Line Items]                    
Percentage of ownership interest acquired 100.00%                  
Cash paid to acquire $ 338,745,000                  
Estimated fair value of contingent consideration 2,800,000       14,200,000   14,200,000     $ 13,300,000
Earnout payment 0                  
Amortization of intangible assets         6,000,000   18,100,000      
Revenues         53,600,000   143,800,000      
Goodwill 236,501,000                  
Goodwill deductible for tax purposes         2,200,000   2,200,000      
Altamira Technologies Corporation | Maximum                    
Business Acquisition [Line Items]                    
Additional amount agreed to pay the selling shareholders in the event an earn out EBITDA target is exceeded 45,000,000                  
Altamira Technologies Corporation | Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense                    
Business Acquisition [Line Items]                    
Acquisition related expenses         0   5,000,000      
Altamira Technologies Corporation | Revolving Credit Facility                    
Business Acquisition [Line Items]                    
Borrowed under credit agreement to partially fund the acquisition $ 330,000,000                  
Chesapeake Technology International, Corp                    
Business Acquisition [Line Items]                    
Percentage of ownership interest acquired     100.00%              
Cash paid to acquire     $ 91,500,000              
Amortization of intangible assets         1,200,000 1,400,000 3,900,000 1,400,000    
Revenues           19,200,000   19,200,000    
Goodwill     $ 57,468,000              
Goodwill deductible for tax purposes         8,800,000   8,800,000      
Chesapeake Technology International, Corp | Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense                    
Business Acquisition [Line Items]                    
Acquisition related expenses                 2,200,000  
Applied Sciences Consulting, Inc.                    
Business Acquisition [Line Items]                    
Percentage of ownership interest acquired   100.00%                
Cash paid to acquire   $ 28,200,000                
Amortization of intangible assets         400,000   1,200,000      
Revenues         2,700,000   8,400,000      
Goodwill   $ 21,852,000                
Applied Sciences Consulting, Inc. | Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense                    
Business Acquisition [Line Items]                    
Acquisition related expenses                 500,000  
TRS Group, Inc                    
Business Acquisition [Line Items]                    
Percentage of ownership interest acquired       100.00%            
Cash paid to acquire       $ 36,600,000            
Amortization of intangible assets         $ 400,000 400,000 $ 1,100,000 1,100,000    
Revenues           $ 7,600,000   $ 19,000,000    
Goodwill       $ 22,972,000            
TRS Group, Inc | Location, Statement of Income, Balance [Axis]: us-gaap:SellingGeneralAndAdministrativeExpense                    
Business Acquisition [Line Items]                    
Acquisition related expenses                 $ 500,000