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Intangible Assets - Narrative (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 county | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Mar. 31, 2025 USD ($) county | Mar. 31, 2024 USD ($) county
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Impairment charges |  |  |  | $ 0 | $ 0
Broadband licenses granted, number of counties | county |  |  |  | 67 | 28
Licenses received |  |  |  | $ 27,030,000 | $ 43,700,000
Licenses exchanged |  |  |  | (4,231,000) | (8,676,000)
Gain on exchange of intangible assets, net |  |  |  | 22,799,000 | 35,024,000
Proceeds from sale of spectrum |  |  |  | 40,935,000 | 25,427,000
Gain on sale of intangible assets |  |  |  | 18,294,000 | 7,364,000
Deferred gain on sale of intangible assets |  |  |  | 4,900,000 |
Payments to acquire intangible assets |  |  |  | $ 18,095,000 | 17,031,000
SDG&E | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Delivery delay adjustments |  |  | $ 1,100,000 |  |
Oncor Electric Delivery Company LLC |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Broadband licenses granted, number of counties | county |  |  |  | 4 |
Wireless Licenses |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Licenses received |  |  |  | $ 27,000,000.0 | 43,700,000
Licenses exchanged |  |  |  | $ (4,200,000) | $ (8,700,000)
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 |  |
Wireless Licenses | Oncor Electric Delivery Company LLC |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Broadband licenses granted, number of counties | county | 95 |  |  | 4 |
Reduction in indefinite-lived intangible assets |  |  |  | $ 22,600,000 |
Gain on sale of intangible assets |  |  |  | 18,300,000 |
Broadband licenses transferred, total consideration |  |  |  | 40,900,000 |
Payments to acquire intangible assets |  |  |  | 34,000,000 |
Previously received, amount |  |  |  | 4,000,000 |
Deposits |  |  |  | 10,000,000 |
Reimbursable clearing costs and anti windfall payments |  |  |  | $ 2,900,000 |

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