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Intangible Assets - Narrative (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2024
county
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Mar. 31, 2025
USD ($)
county
Mar. 31, 2024
USD ($)
county
Acquired Indefinite-lived Intangible Assets [Line Items]          
Impairment charges       $ 0 $ 0
Broadband licenses granted, number of counties | county       67 28
Licenses received       $ 27,030,000 $ 43,700,000
Licenses exchanged       (4,231,000) (8,676,000)
Gain on exchange of intangible assets, net       22,799,000 35,024,000
Proceeds from sale of spectrum       40,935,000 25,427,000
Gain on sale of intangible assets       18,294,000 7,364,000
Deferred gain on sale of intangible assets       4,900,000  
Payments to acquire intangible assets       $ 18,095,000 17,031,000
SDG&E | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement          
Acquired Indefinite-lived Intangible Assets [Line Items]          
Delivery delay adjustments     $ 1,100,000    
Oncor Electric Delivery Company LLC          
Acquired Indefinite-lived Intangible Assets [Line Items]          
Broadband licenses granted, number of counties | county       4  
Wireless Licenses          
Acquired Indefinite-lived Intangible Assets [Line Items]          
Licenses received       $ 27,000,000.0 43,700,000
Licenses exchanged       $ (4,200,000) $ (8,700,000)
Proceeds from sale of spectrum   $ 700,000 44,000,000    
Reduction in indefinite-lived intangible assets   600,000 31,800,000    
Gain on sale of intangible assets   $ 32,000 $ 7,300,000    
Wireless Licenses | Oncor Electric Delivery Company LLC          
Acquired Indefinite-lived Intangible Assets [Line Items]          
Broadband licenses granted, number of counties | county 95     4  
Reduction in indefinite-lived intangible assets       $ 22,600,000  
Gain on sale of intangible assets       18,300,000  
Broadband licenses transferred, total consideration       40,900,000  
Payments to acquire intangible assets       34,000,000  
Previously received, amount       4,000,000  
Deposits       10,000,000  
Reimbursable clearing costs and anti windfall payments       $ 2,900,000