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Revenue - Spectrum Sale Agreements (Details) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2026 USD ($) license | Jan. 31, 2026 USD ($) | Jan. 30, 2026 USD ($) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |  |
Prepayments received | $ 161,178 |  |  | $ 124,672 | $ 122,212
CPS Energy (“CPS”) | License |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Remaining performance obligation, amount |  | $ 13,000 |  |  |
Prepayments received | 6,500 |  | $ 13,000 |  |
Payments remaining | $ 6,500 |  |  |  |
Broadband license(s) remaining | license | 1 |  |  |  |
Texas-New Mexico Power Company (“TNMP”) | License |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Remaining performance obligation, amount | $ 3,200 |  |  |  |
Prepayments received | 0 |  |  |  |
Payments remaining | $ 3,200 |  |  |  |
Broadband license(s) remaining | license | 2 |  |  |  |
NorthWestern Energy (“NWE”) | License |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Remaining performance obligation, amount | $ 7,700 |  |  |  |
Prepayments received | 0 |  |  |  |
Payments remaining | $ 7,700 |  |  |  |
Broadband license(s) remaining | license | 65 |  |  |  |

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