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Intangible Assets - Narrative (Details)
 3 Months Ended 6 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
county
Sep. 30, 2022
USD ($)
county
Mar. 31, 2023
USD ($)
Acquired Indefinite-lived Intangible Assets [Line Items]          
Impairment     $ 0    
Broadband licenses granted, number of counties | county     14 45  
Gain on disposal of intangible assets, net $ (8,500,000) $ (2,900,000) $ (19,300,000) $ (3,600,000)  
Sale of intangible assets     25,178,000 0  
Gain on sale of intangible assets, net 7,332,000 0 7,332,000 0  
Deferred gain on sale of intangible assets 4,889,000 $ 0 4,889,000 0 $ 0
Wireless Licenses          
Acquired Indefinite-lived Intangible Assets [Line Items]          
Exchanges – licenses received     24,146,000 4,900,000  
Licenses exchanged     4,848,000 $ (1,300,000)  
Sale of intangible assets     44,000,000    
Reduction of intangible assets     31,800,000    
Gain on sale of intangible assets, net $ 7,300,000   $ 7,300,000