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Acquisitions - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2025
Jan. 31, 2025
Nov. 01, 2024
Aug. 16, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Business Acquisition [Line Items]                  
Amortization of intangible assets         $ 18,000 $ 13,300 $ 51,400 $ 40,800  
Revenues         1,621,748 1,810,116 4,760,431 5,016,259  
Goodwill         2,163,469   2,163,469   $ 2,082,680
Paid in 18 months                  
Business Acquisition [Line Items]                  
Cash paid to acquire   $ 3,800              
Chesapeake Technology International, Corp                  
Business Acquisition [Line Items]                  
Percentage of ownership interest acquired 100.00%                
Cash paid to acquire $ 91,500                
Amortization of intangible assets         1,400   1,400    
Revenues         19,200   19,200    
Goodwill $ 57,998                
Goodwill deductible for tax purposes         8,500   8,500    
Chesapeake Technology International, Corp | Selling, General and Administrative Expense                  
Business Acquisition [Line Items]                  
Acquisition related expenses             2,200    
TRS group Inc                  
Business Acquisition [Line Items]                  
Percentage of ownership interest acquired   100.00%              
Cash paid to acquire   $ 36,600              
Amortization of intangible assets         400   1,100    
Revenues         7,600   19,000    
Goodwill   $ 22,972              
TRS group Inc | Selling, General and Administrative Expense                  
Business Acquisition [Line Items]                  
Acquisition related expenses             500    
BCC Engineering, LLC                  
Business Acquisition [Line Items]                  
Percentage of ownership interest acquired     100.00%            
Cash paid to acquire     $ 233,500            
Amortization of intangible assets         2,200   6,600    
Revenues         32,500   95,900    
Goodwill     $ 175,680            
Goodwill deductible for tax purposes         45,800   45,800    
BCC Engineering, LLC | Selling, General and Administrative Expense                  
Business Acquisition [Line Items]                  
Acquisition related expenses                 $ 4,200
BlackSignal Technologies, LLC.                  
Business Acquisition [Line Items]                  
Percentage of ownership interest acquired       100.00%          
Cash paid to acquire       $ 203,700          
Amortization of intangible assets         $ 3,200 2,100 $ 9,700 2,100  
Revenues           6,700   6,700  
Goodwill       116,849          
Goodwill deductible for tax purposes       $ 17,100          
BlackSignal Technologies, LLC. | Selling, General and Administrative Expense                  
Business Acquisition [Line Items]                  
Acquisition related expenses           $ 2,500   $ 2,500