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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 |  |

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