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Contingencies and Guaranty (Details) - USD ($)
$ in Thousands
 1 Months Ended 9 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Apr. 30, 2023
Oct. 31, 2022
Sep. 30, 2022
Feb. 28, 2021
Dec. 31, 2024
Dec. 31, 2023
Nov. 30, 2024
Sep. 30, 2024
Mar. 31, 2024
Mar. 31, 2023
Commitments And Contingencies [Line Items]                          
Contingent liability             $ 20,000 $ 22,033       $ 15,000  
Contingent liability   $ 1,000           5,397 $ 1,000     1,000  
Payments to acquire intangible assets               12,621 14,809        
Increase in deposit assets   7,500                      
Prepayments received   107,060 $ 80,265         126,061 $ 107,060   $ 126,627 $ 122,212 $ 60,759
SDG&E | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement                          
Commitments And Contingencies [Line Items]                          
Milestone payment received   200 25,200     $ 200              
Delivery delay adjustments     $ 1,100                    
Lower Colorado River Authority (LCRA) | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement                          
Commitments And Contingencies [Line Items]                          
Initial payment received   $ 15,000                      
Short-term contingent consideration               400          
Long-term contingent consideration               14,600          
Lower Colorado River Authority (LCRA) | Licensing Agreements                          
Commitments And Contingencies [Line Items]                          
Contingent liability                   $ 1,400      
Payments to acquire intangible assets       $ 30,000                  
Oncor Electric Delivery Company LLC | Licensing Agreements                          
Commitments And Contingencies [Line Items]                          
Short-term contingent consideration               4,000          
Long-term contingent consideration               6,000          
Broadband licenses granted estimated consideration $ 102,500                        
Initial consideration received $ 10,000                        
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement                          
Commitments And Contingencies [Line Items]                          
Agreement term (in years)         20 years                
Prepayments received               67,100          
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Maximum                          
Commitments And Contingencies [Line Items]                          
Prepayments received               $ 62,800          
SDG&E                          
Commitments And Contingencies [Line Items]                          
Consideration transferred             $ 50,000