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Intangible Assets - Narrative (Details)
 3 Months Ended 6 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2022
USD ($)
county
channel
Mar. 31, 2022
USD ($)
Acquired Indefinite-lived Intangible Assets [Line Items]      
Impairment   $ 0  
Broadband Licenses Granted, Channels To Surrender | channel   240  
Initial deposits $ 10,700,000 $ 10,700,000 $ 8,000,000
Prepaid expenses and other current assets 11,715,000 11,715,000 10,147,000
Other assets 7,787,000 $ 7,787,000 4,108,000
Broadband licenses granted, number of counties | county   45  
Gain (loss) from disposal of intangible assets, net (2,900,000) $ (3,600,000)  
In-Process Deals      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Prepaid expense and other assets 7,200,000 7,200,000 3,400,000
Prepaid expenses and other current assets 500,000 500,000 200,000
Other assets 6,700,000 6,700,000 3,100,000
Wireless Licenses      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Consideration transferred   4,700,000  
Wireless Licenses | Third Parties      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Consideration transferred   3,700,000  
Wireless Licenses | Anti-Windfall      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Consideration transferred   1,000,000  
Prepaid Expenses and Other Current Assets      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Initial deposits 10,100,000 10,100,000 7,600,000
Other Assets      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Initial deposits 600,000 600,000 $ 400,000
New Wireless Licenses      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Indefinite-lived intangible assets fair value disclosure $ 4,900,000 4,900,000  
Narrowband Licenses      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Amount disposed   $ 1,300,000