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Intangible Assets - Narrative (Details)
 3 Months Ended
Jun. 30, 2025
USD ($)
country
county
Jun. 30, 2024
USD ($)
county
Acquired Indefinite-lived Intangible Assets [Line Items]    
Impairment $ 0 $ 0
Broadband licenses granted, number of counties | county 62 1
Exchanges - licenses received $ 40,618,000 $ 126,000
Licenses exchanged 6,702,000 33,000
Gain on exchange of intangible assets, net 33,916,000 93,000
Payments to acquire intangible assets 3,966,000 5,400,000
Decrease in contingent liability (1,054,000) (10,000,000)
Gain on disposal of intangible assets 961,000 0
Licensing Agreements    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Exchanges - licenses received 40,600,000 100,000
Licenses exchanged $ 6,700,000 $ 0
Licensing Agreements | Lower Colorado River Authority    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Broadband licenses granted, number of counties | country 24  
Broadband licenses transferred, total consideration $ 2,200,000  
Payments to acquire intangible assets 1,100,000  
Decrease in contingent liability 1,100,000  
Reduction of intangible assets 1,200,000  
Gain on disposal of intangible assets 1,000,000  
Licensing Agreements | Oncor Electric Delivery Company LLC    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Broadband licenses transferred, total consideration 300,000  
Reduction of intangible assets 300,000  
Gain on disposal of intangible assets $ 8,000