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Goodwill and Intangible Assets - Schedule of Changes in Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
 3 Months Ended 4 Months Ended 6 Months Ended 12 Months Ended 13 Months Ended
Jul. 01, 2025
Dec. 02, 2024
Sep. 03, 2024
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2025
Sep. 30, 2025
Goodwill [Roll Forward]                          
Beginning Balance         $ 33,034       $ 33,034 $ 33,034 $ 16,374    
Measurement period adjustments, goodwill                 100        
Ending Balance       $ 70,600   $ 33,034 $ 33,034 $ 70,600   70,600 33,034 $ 70,600  
Industrial Air Transaction                          
Goodwill [Roll Forward]                          
Measurement period adjustments, goodwill                     59    
Kent Island                          
Goodwill [Roll Forward]                          
Beginning Balance       5,578                  
Measurement period adjustments, goodwill         100   700     94     $ 765
Goodwill associated with acquisition                     5,484    
Ending Balance     $ 4,813                   5,578
Consolidated Mechanical                          
Goodwill [Roll Forward]                          
Beginning Balance       11,120                  
Measurement period adjustments, goodwill                 100 3   3  
Goodwill associated with acquisition                     11,117    
Ending Balance   $ 11,117                     $ 11,120
Kent Island Mechanical, Inc.                          
Goodwill [Roll Forward]                          
Measurement period adjustments, goodwill         100 700              
Ending Balance     $ 4,800                    
Pioneer Power Inc.                          
Goodwill [Roll Forward]                          
Measurement period adjustments, goodwill       900       855   855      
Goodwill associated with acquisition                   36,614      
Ending Balance $ 36,614     37,469       37,469   37,469   37,469  
GCR                          
Goodwill [Roll Forward]                          
Beginning Balance         4,244       4,244 4,244 0    
Ending Balance       15,578   4,244 4,244 15,578   15,578 4,244 15,578  
GCR | Industrial Air Transaction                          
Goodwill [Roll Forward]                          
Measurement period adjustments, goodwill                     0    
GCR | Kent Island                          
Goodwill [Roll Forward]                          
Measurement period adjustments, goodwill                   94      
Goodwill associated with acquisition                     4,244    
GCR | Consolidated Mechanical                          
Goodwill [Roll Forward]                          
Measurement period adjustments, goodwill                   0      
Goodwill associated with acquisition                     0    
GCR | Pioneer Power Inc.                          
Goodwill [Roll Forward]                          
Measurement period adjustments, goodwill                   256      
Goodwill associated with acquisition                   10,984      
ODR                          
Goodwill [Roll Forward]                          
Beginning Balance         $ 28,790       $ 28,790 28,790 16,374    
Ending Balance       $ 55,022   $ 28,790 $ 28,790 $ 55,022   55,022 28,790 $ 55,022  
ODR | Industrial Air Transaction                          
Goodwill [Roll Forward]                          
Measurement period adjustments, goodwill                     59    
ODR | Kent Island                          
Goodwill [Roll Forward]                          
Measurement period adjustments, goodwill                   0      
Goodwill associated with acquisition                     1,240    
ODR | Consolidated Mechanical                          
Goodwill [Roll Forward]                          
Measurement period adjustments, goodwill                   3      
Goodwill associated with acquisition                     $ 11,117    
ODR | Pioneer Power Inc.                          
Goodwill [Roll Forward]                          
Measurement period adjustments, goodwill                   599      
Goodwill associated with acquisition                   $ 25,630