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Intangible Assets - Narrative (Details)
 3 Months Ended 9 Months Ended
Dec. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
county
channel
Mar. 31, 2022
USD ($)
Acquired Indefinite-lived Intangible Assets [Line Items]      
Impairment   $ 0  
Channels to surrender | channel   240  
Initial deposits $ 13,300,000 $ 13,300,000 $ 8,000,000
Prepaid expenses and other current assets 14,957,000 14,957,000 10,147,000
Other assets 8,572,000 $ 8,572,000 4,108,000
Broadband licenses granted, number of counties | county   70  
Gain (loss) from disposal of intangible assets, net (5,800,000) $ (9,300,000)  
In-Process Deals      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Prepaid expense and other assets 8,000,000 8,000,000 3,400,000
Prepaid expenses and other current assets 600,000 600,000 200,000
Other assets 7,400,000 7,400,000 3,100,000
Wireless Licenses      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Consideration transferred   9,200,000  
Wireless Licenses | Third Parties      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Consideration transferred   7,000,000  
Wireless Licenses | Anti-Windfall      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Consideration transferred   2,200,000  
Prepaid Expenses and Other Current Assets      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Initial deposits 12,700,000 12,700,000 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 $ 13,100,000 13,100,000  
Narrowband Licenses      
Acquired Indefinite-lived Intangible Assets [Line Items]      
Amount disposed   $ 3,800,000