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Nature of Operations and Basis of Presentation - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 45 Months Ended
Sep. 30, 2023
USD ($)
Jul. 31, 2023
USD ($)
county
Apr. 30, 2023
mi²
city
people
county
Oct. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Feb. 28, 2021
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
county
Sep. 30, 2022
USD ($)
county
Dec. 31, 2026
USD ($)
Sep. 21, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Mar. 31, 2022
USD ($)
Sep. 30, 2021
USD ($)
Conversion of Stock [Line Items]                                
Broadband licenses granted, number of counties | county                 14 45            
Payments to acquire intangible assets                 $ 10,077 $ 11,228            
Prepayments received $ 80,265       $ 53,945   $ 80,265 $ 53,945 80,265 53,945     $ 60,759   $ 54,678  
Spectrum revenues             1,052 398 1,660 733            
Contingent liability           $ 20,000                    
Stock repurchase program, authorized amount                       $ 250,000       $ 50,000
SDG&E                                
Conversion of Stock [Line Items]                                
Consideration transferred           $ 50,000                    
Lower Colorado River Authority (LCRA) | Wireless Licenses                                
Conversion of Stock [Line Items]                                
Broadband licenses granted, number of counties | county     68                          
Broadband licenses granted, number of cities | city     30                          
Broadband licenses granted, number of customers | people     100                          
Broadband licenses granted, service area | mi²     73,000                          
Lower Colorado River Authority (LCRA) | Wireless Licenses | Forecast                                
Conversion of Stock [Line Items]                                
Payments to acquire intangible assets                     $ 30,000          
Xcel Energy | Spectrum revenue                                
Conversion of Stock [Line Items]                                
Spectrum revenues             444 $ 0 444 $ 0            
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement                                
Conversion of Stock [Line Items]                                
Broadband licenses granted, number of counties | county   14                            
Agreement term       20 years                        
Total scheduled prepayments       $ 80,000                        
Prepayments received 29,200           $ 29,200   $ 29,200         $ 8,000    
Milestone payment received   $ 21,200                            
SDG&E | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement                                
Conversion of Stock [Line Items]                                
Milestone payment received 25,200       $ 200                      
Delivery delay adjustments $ 1,100