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Acquisitions and Dispositions Of Businesses (Details)
$ in Thousands
 3 Months Ended 8 Months Ended 9 Months Ended 12 Months Ended
Feb. 03, 2025
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2025
USD ($)
Company
Sep. 30, 2024
USD ($)
Dec. 31, 2024
USD ($)
Company
Mar. 31, 2025
USD ($)
Business Combination [Line Items]                
Number of businesses acquired | Company         6   7  
Goodwill   $ 1,359,323   $ 1,359,323 $ 1,359,323   $ 1,018,415  
Revenues   4,301,529 $ 3,696,924   12,473,301 $ 10,796,097    
Operating income   405,696 363,538   1,139,664 956,299    
Amortization of identifiable intangible assets   30,515 $ 20,147   86,967 $ 56,559    
2024Acquisitions                
Business Combination [Line Items]                
Purchase price             231,100  
Working capital acquired             29,000  
Other net assets             1,100  
Goodwill             61,900  
Identifiable intangible assets             $ 139,100  
MillerElectric                
Business Combination [Line Items]                
Purchase price $ 868,600              
Goodwill [1] 318,576              
Identifiable intangible assets $ 475,000              
Business acquisition, percentage acquired 100.00%              
Revenues       794,400        
Operating income       21,200        
Amortization of identifiable intangible assets       29,400        
Business acquisition, transaction costs               $ 9,400
2025Acquisitions                
Business Combination [Line Items]                
Purchase price         50,900      
Working capital acquired   5,000   5,000 5,000      
Other net assets   2,800   2,800 2,800      
Goodwill   22,400   22,400 22,400      
Identifiable intangible assets   $ 20,700   $ 20,700 $ 20,700      
[1] Goodwill is calculated as the excess of the consideration transferred over the fair value of the net assets acquired and represents the projected future economic benefits from this strategic acquisition.