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Contingencies and Guaranty (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Apr. 30, 2023
USD ($)
Oct. 31, 2022
state
Feb. 28, 2021
USD ($)
Jun. 30, 2025
USD ($)
Sep. 30, 2025
USD ($)
county
country
Sep. 30, 2024
USD ($)
county
Mar. 31, 2025
USD ($)
country
Nov. 30, 2024
USD ($)
Mar. 31, 2024
USD ($)
Commitments And Contingencies [Line Items]                      
Contingent liability             $ 8,802   $ 8,093    
Payments to acquire intangible assets             $ 17,147 $ 10,904      
Broadband licenses granted, number of counties | county             161 1      
Decrease in contingent liability             $ (7,425) $ (10,000)      
Contract with customer liability $ 128,214 $ 120,687       $ 128,214 130,416 126,627 $ 124,672   $ 122,212
Employer contribution amount             200 $ 300      
Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Wireless Licenses                      
Commitments And Contingencies [Line Items]                      
Consideration transferred $ 28,000                    
Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Maximum | Wireless Licenses                      
Commitments And Contingencies [Line Items]                      
Contract with customer liability             22,500        
Lower Colorado River Authority (LCRA) | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement                      
Commitments And Contingencies [Line Items]                      
Short-term contingent consideration             800        
Long-term contingent consideration             7,100        
Lower Colorado River Authority (LCRA) | Licensing Agreements                      
Commitments And Contingencies [Line Items]                      
Contingent liability                   $ 1,400  
Payments to acquire intangible assets     $ 30,000                
Lower Colorado River Authority | Licensing Agreements                      
Commitments And Contingencies [Line Items]                      
Payments to acquire intangible assets             $ 13,600        
Broadband licenses granted, number of counties | county             50        
Decrease in contingent liability             $ 14,900        
Broadband license narrowband spectrum licenses previously received             $ 1,300        
Oncor Electric Delivery Company LLC | Licensing Agreements                      
Commitments And Contingencies [Line Items]                      
Broadband licenses granted, number of counties | country             3        
Long-term contingent consideration             $ 7,000        
Broadband licenses granted estimated consideration   $ 102,500                  
Oncor Electric Delivery Company LLC | Licensing Agreements For Four Counties                      
Commitments And Contingencies [Line Items]                      
Broadband licenses granted, number of counties | country                 4    
Oncor Electric Delivery Company LLC | Licensing Agreements For Four Counties | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement                      
Commitments And Contingencies [Line Items]                      
Milestone payment received                 $ 34,000    
Proceeds from nontrade receivable           $ 2,900          
Oncor Electric Delivery Company LLC | Licensing Agreements For Three Counties | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement                      
Commitments And Contingencies [Line Items]                      
Milestone payment received             300        
Proceeds from nontrade receivable             20        
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement                      
Commitments And Contingencies [Line Items]                      
Agreement term (in years)       20 years              
Number of states in service territory | state       8              
Contract with customer liability             70,900        
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Maximum                      
Commitments And Contingencies [Line Items]                      
Contract with customer liability             64,100        
SDG&E                      
Commitments And Contingencies [Line Items]                      
Consideration transferred         $ 50,000            
Contingent consideration, liability, current             $ 1,000   $ 1,000