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Intangible Assets - Narrative (Details)
 1 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Aug. 31, 2020
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2022
USD ($)
country
Mar. 31, 2022
USD ($)
county
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Jan. 31, 2018
USD ($)
Acquired Indefinite-lived Intangible Assets [Line Items]                
Impairment charges     $ 0     $ 0 $ 0  
Acquisitions     17,800,000     15,600,000    
Initial deposits     8,000,000 $ 8,000,000 $ 8,000,000 2,300,000    
Prepaid expenses and other current assets     10,147,000 10,147,000 10,147,000 3,508,000    
Other assets     4,108,000 4,108,000 4,108,000 1,214,000    
Gain (loss) from disposal of intangible assets, net     11,209,000     (3,849,000) (88,000)  
Contract liability     54,678,000 54,678,000 54,678,000 2,983,000 3,462,000  
Book value     151,169,000 151,169,000 151,169,000 122,117,000    
Property and equipment, net     2,949,000 $ 2,949,000 $ 2,949,000 3,574,000    
Cash             15,000  
Wireless licenses             88,000  
Gain on agreement             52,000  
Broadband licenses granted, number of countries       21 21      
AAR                
Acquired Indefinite-lived Intangible Assets [Line Items]                
Gain (loss) from disposal of intangible assets, net           (4,700,000)    
Equipment                
Acquired Indefinite-lived Intangible Assets [Line Items]                
Property and equipment, net             21,000  
Prepaid Expenses and Other Current Assets                
Acquired Indefinite-lived Intangible Assets [Line Items]                
Initial deposits     7,600,000 $ 7,600,000 $ 7,600,000 1,900,000    
Other Assets                
Acquired Indefinite-lived Intangible Assets [Line Items]                
Initial deposits     400,000 400,000 400,000 400,000    
Spectrum Licenses                
Acquired Indefinite-lived Intangible Assets [Line Items]                
Gain (loss) from disposal of intangible assets, net $ 1,100,000              
Estimated fair value 200,000              
Payment 1,200,000              
Contract liability 600,000             $ 600,000
Book value $ 300,000              
Wireless Licenses                
Acquired Indefinite-lived Intangible Assets [Line Items]                
Acquisitions     17,843,000     15,640,000    
Book value     151,169,000 151,169,000 151,169,000 122,117,000 $ 111,526,000  
Exchanges - licenses received     15,341,000     196,000    
Exchanges - licenses surrendered     (4,132,000)     (262,000)    
Reprogramming                
Acquired Indefinite-lived Intangible Assets [Line Items]                
Gain (loss) from disposal of intangible assets, net   $ (300,000)            
In Process Deals                
Acquired Indefinite-lived Intangible Assets [Line Items]                
Prepaid expense and other assets     3,400,000 3,400,000 3,400,000 400,000    
Prepaid expenses and other current assets     200,000 200,000 200,000 100,000    
Other assets     $ 3,100,000 $ 3,100,000 $ 3,100,000 $ 300,000