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Intangible Assets - Narrative (Details) | 12 Months Ended | 22 Months Ended
--- | --- | ---
Mar. 31, 2026 USD ($) county | Mar. 31, 2025 USD ($) county | Mar. 31, 2026 USD ($)
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Impairment charges | $ 0 | $ 0 |
Broadband licenses granted, number of counties | county | 219 | 67 |
Licenses received | $ 139,608,000 | $ 27,030,000 |
Licenses exchanged | (34,189,000) | (4,231,000) |
Payments to acquire intangible assets | 27,172,000 | 18,095,000 |
Reduction of contingent liability | (6,195,000) | (5,999,000) |
Gain on sale of intangible assets | 34,780,000 | 18,294,000 |
Wireless Licenses |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Licenses received | 139,600,000 | 27,000,000.0 |
Licenses exchanged | $ (34,200,000) | $ (4,200,000) |
Wireless Licenses | Lower Colorado River Authority |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Broadband licenses granted, number of counties | county | 64 |  |
Broadband licenses transferred, total consideration | $ 29,500,000 |  |
Payments to acquire intangible assets | 14,100,000 |  |
Reduction of contingent liability | 15,400,000 |  |
Reduction in indefinite-lived intangible assets | 16,600,000 |  |
Gain on sale of intangible assets | $ (12,800,000) |  |
Wireless Licenses | Oncor |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |
Broadband licenses granted, number of counties | county | 91 | 4 |
Broadband licenses transferred, total consideration | $ 59,700,000 | $ 40,900,000 |
Payments to acquire intangible assets | 53,700,000 | 34,000,000.0 |
Reduction in indefinite-lived intangible assets | 37,700,000 | 22,600,000 |
Previously received, amount |  | 4,000,000.0 |
Deposits |  | 10,000,000.0 |
Reimbursable clearing costs and anti windfall payments | 6,000,000.0 | 2,900,000 | $ 7,500,000
Gain on sale of intangible assets | $ (22,000,000.0) | $ 18,300,000 |

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