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Intangible Assets - Narrative (Details)
 3 Months Ended 9 Months Ended
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
county
Dec. 31, 2022
USD ($)
county
Mar. 31, 2023
USD ($)
Acquired Indefinite-lived Intangible Assets [Line Items]            
Impairment $ 0   $ 0 $ 0 $ 0  
Broadband licenses granted, number of counties | county       24 70  
Exchanges – licenses received       $ 41,250,000 $ 13,107,000  
Licenses exchanged       8,215,000 3,778,000  
Gain on disposal of intangible assets, net (13,700,000)   (5,800,000) (33,000,000) (9,300,000)  
Sale of intangible assets       25,427,000 0  
Gain on sale of intangible assets, net 32,000   0 7,364,000 0  
Deferred gain on sale of intangible assets 4,911,000   $ 0 4,911,000 0 $ 0
SDG&E | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement            
Acquired Indefinite-lived Intangible Assets [Line Items]            
Delivery delay adjustments   $ 1,100,000        
Licensing Agreements            
Acquired Indefinite-lived Intangible Assets [Line Items]            
Exchanges – licenses received       41,300,000 13,100,000  
Licenses exchanged       $ 8,200,000 $ 3,800,000  
Sale of intangible assets 700,000 44,000,000        
Reduction of intangible assets 600,000 31,800,000        
Gain on sale of intangible assets, net $ 32,000 $ 7,300,000