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Intangible Assets - Narrative (Details)
 3 Months Ended 6 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
county
country
Sep. 30, 2024
USD ($)
county
Acquired Indefinite-lived Intangible Assets [Line Items]        
Impairment $ 0 $ 0 $ 0 $ 0
Broadband licenses granted, number of counties | county     161 1
Exchanges - licenses received     $ 115,032,000 $ 126,000
Licenses exchanged     21,514,000 33,000
Gain on exchange of intangible assets, net 59,600,000 0 93,518,000 93,000
Payments to acquire intangible assets     17,147,000 10,904,000
Decrease in contingent liability     (7,425,000) (10,000,000)
Gain on sale of intangible assets, net 11,469,000 $ 0 12,430,000 0
Licensing Agreements        
Acquired Indefinite-lived Intangible Assets [Line Items]        
Exchanges - licenses received     115,000,000.0 100,000
Licenses exchanged     $ 21,500,000 0
Licensing Agreements | Lower Colorado River Authority        
Acquired Indefinite-lived Intangible Assets [Line Items]        
Broadband licenses granted, number of counties | county     50  
Broadband licenses transferred, total consideration     $ 28,500,000  
Payments to acquire intangible assets     13,600,000  
Decrease in contingent liability     14,900,000  
Reduction of intangible assets 14,900,000   16,100,000  
Gain on sale of intangible assets, net $ 11,500,000   $ 12,400,000  
Licensing Agreements | Oncor Electric Delivery Company LLC        
Acquired Indefinite-lived Intangible Assets [Line Items]        
Broadband licenses granted, number of counties | country     3  
Broadband licenses transferred, total consideration     $ 300,000 0
Reduction of intangible assets     300,000 0
Gain on sale of intangible assets, net     $ 8,000 $ 0