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Intangible Assets - Narrative (Details)
1 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Mar. 31, 2024
USD ($)
county
Mar. 31, 2023
USD ($)
county
Acquired Indefinite-lived Intangible Assets [Line Items]          
Impairment charges       $ 0 $ 0
Broadband licenses granted, number of counties | county       28 84
Gain (loss) from disposal of intangible assets, net       $ 35,024,000 $ 38,399,000
Proceeds from sale of spectrum       25,427,000 0
Gain on sale of intangible assets       7,364,000 0
SDG&E | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement          
Acquired Indefinite-lived Intangible Assets [Line Items]          
Delivery delay adjustments $ 1,100,000   $ 1,100,000    
Wireless Licenses          
Acquired Indefinite-lived Intangible Assets [Line Items]          
Licenses received       43,700,000 46,174,000
Licenses exchanged       $ 8,676,000 $ 7,775,000
Proceeds from sale of spectrum   $ 700,000 44,000,000    
Reduction in indefinite-lived intangible assets   600,000 31,800,000    
Gain on sale of intangible assets   $ 32,000 $ 7,300,000