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Contingencies and Guaranty (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Sep. 30, 2023
Apr. 30, 2023
Oct. 31, 2022
Sep. 30, 2022
Feb. 28, 2021
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Mar. 31, 2024
Jun. 30, 2023
Mar. 31, 2023
Commitments And Contingencies [Line Items]                            
Contingent liability             $ 20,000 $ 25,000   $ 25,000   $ 15,000    
Contingent liability   $ 1,000           1,000   1,000   1,000    
Payments to acquire intangible assets                   10,904 $ 10,077      
Increase in deposit assets   7,500                        
Prepayments received $ 120,687   $ 80,265         126,627 $ 80,265 126,627 80,265 $ 122,212 $ 60,151 $ 60,759
Spectrum revenue               1,551 1,052 3,076 1,660      
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                        
Lower Colorado River Authority (LCRA) | Licensing Agreements                            
Commitments And Contingencies [Line Items]                            
Payments to acquire intangible assets       $ 30,000                    
Oncor Electric Delivery Company LLC | Licensing Agreements                            
Commitments And Contingencies [Line Items]                            
Broadband licenses granted estimated consideration 102,500                          
Initial consideration received $ 10,000                          
Xcel Energy | Spectrum revenue                            
Commitments And Contingencies [Line Items]                            
Spectrum revenue               802 $ 444 1,603 $ 444      
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   67,100        
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Maximum                            
Commitments And Contingencies [Line Items]                            
Prepayments received               $ 63,600   $ 63,600        
SDG&E                            
Commitments And Contingencies [Line Items]                            
Consideration transferred             $ 50,000