v3.26.1
Discontinued Operations, Goodwill and Intangible Assets - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2020
Dec. 06, 2019
USD ($)
Jul. 31, 2026
USD ($)
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Jun. 30, 2025
USD ($)
Sep. 30, 2025
USD ($)
acquisition
Jun. 30, 2024
USD ($)
Dec. 31, 2014
USD ($)
Feb. 28, 2011
USD ($)
Basis of presentation                        
Non-cash loss on disposal activities             $ 64,549 $ 0        
Noncurrent assets held for sale       $ 29,042     29,042   $ 18,953      
Amortization expense of acquired intangible assets             44,000 $ 1,800        
2025 Acquisitions                        
Basis of presentation                        
Number of business acquisitions | acquisition                 2      
Total consideration                 $ 375,900      
Stock consideration                 146,400      
Task Order, Deactivation Demolition And Removal Service                        
Basis of presentation                        
Percentage of claim recoveries due to purchaser 10.00%                      
Percentage of claim recoveries due to seller 90.00%                      
Refinery Turnaround Project                        
Basis of presentation                        
Loss from reduction in expected future net cash proceeds           $ 53,000            
Loss contingency, receivable, proceeds       51,100                
Litigation settlement, loss       2,700                
Department of Energy | Task Order, Deactivation Demolition And Removal Service                        
Basis of presentation                        
Maximum project cost to pay                       $ 106,000
Additional fees on changed work scope   $ 60,400                 $ 103,000  
Non-cash loss on disposal activities         $ 61,800              
Department of Energy | Task Order, Deactivation Demolition And Removal Service | Subsequent Event                        
Basis of presentation                        
Loss contingency, receivable, proceeds     $ 58,500                  
Department of Energy | Task Order, Deactivation Demolition And Removal Service | Minimum | Former Affiliate                        
Basis of presentation                        
Damages sought   148,500                    
Department of Energy | Task Order, Deactivation Demolition And Removal Service | Maximum | Former Affiliate                        
Basis of presentation                        
Damages sought   $ 329,400                    
Former Affiliate and DOE | Task Order, Deactivation Demolition And Removal Service                        
Basis of presentation                        
Maximum project cost to pay                       146,000
Minimum project cost to pay                       106,000
Former Affiliate | Task Order, Deactivation Demolition And Removal Service                        
Basis of presentation                        
Minimum project cost to pay                       $ 146,000
Held for Sale                        
Basis of presentation                        
Equity method investment       29,000     29,000          
Noncurrent assets held for sale       29,000     29,000   $ 19,000      
Held for Sale | Revolving Credit Facility                        
Basis of presentation                        
Investment commitment to fund                   $ 30,000    
Fund outflow in other investing activities and outstanding       $ 30,700     $ 30,700