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Intangible Assets - Narrative (Details)
 3 Months Ended 9 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2024
USD ($)
county
Dec. 31, 2023
USD ($)
county
Mar. 31, 2024
USD ($)
Acquired Indefinite-lived Intangible Assets [Line Items]            
Impairment $ 0 $ 0   $ 0 $ 0  
Broadband licenses granted, number of counties | county       20 24  
Exchanges - licenses received       $ 23,838,000 $ 41,250,000  
Licenses exchanged       2,992,000 8,215,000  
Gain on disposal of intangible assets, net (20,753,000) (13,737,000)   (20,846,000) (33,035,000)  
Sale of intangible assets       0 25,427,000  
Gain on disposal of intangible assets 0 32,000   0 7,364,000  
Deferred gain on sale of intangible assets $ 4,911,000     4,911,000   $ 4,911,000
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       23,800,000 41,300,000  
Licenses exchanged       $ 3,000,000.0 $ 8,200,000  
Sale of intangible assets   700,000 44,000,000      
Reduction of intangible assets   600,000 31,800,000      
Gain on disposal of intangible assets   $ 32,000 $ 7,300,000