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Revenue - Narrative (Details) $ in Thousands, people in Millions, customer in Millions | 1 Months Ended |  |  |  |  |  |
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Oct. 31, 2024 USD ($) | Sep. 30, 2024 USD ($) | Jan. 31, 2024 USD ($) | Nov. 30, 2023 USD ($) mi² term | Jul. 31, 2023 USD ($) | Oct. 31, 2022 USD ($) customer term | Oct. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) people renewalOption | Feb. 28, 2021 USD ($) | Dec. 31, 2020 USD ($) people | Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2014 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of people covered by network | people |  |  |  |  |  |  |  |  |  | 7.5 |  |  |  |  |  |
Lease term |  |  |  |  |  |  |  |  |  | 30 years |  |  |  |  |  |
Lease extension |  |  |  |  |  |  |  | 10 years |  | 10 years |  |  |  |  |  |
Scheduled prepayments |  |  |  |  |  |  |  |  |  | $ 47,700 |  |  |  |  |  |
Contractual term |  |  |  |  |  |  |  |  |  | 30 years |  |  |  |  |  |
Days after agreement execution, payments due |  |  |  |  |  |  |  | 30 days |  |  |  |  |  |  |  |
Prepayments received |  |  |  |  |  |  |  |  |  |  | $ 124,672 | $ 122,212 |  | $ 60,759 |  |
Prepaid expenses and other current assets |  |  |  |  |  |  |  |  |  |  | 2,801 | $ 3,912 |  |  |  |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-04-01 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining performance obligation, amount |  |  |  |  |  |  |  |  |  |  | $ 181,500 |  |  |  |  |
Remaining performance obligation, expected timing of satisfaction, period |  |  |  |  |  |  |  |  |  |  | 30 years |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease extension |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |
Contractual term |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |
Total spectrum revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other current assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,500
Ameren |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease payments received | $ 1,000 | $ 7,500 |  |  |  |  | $ 17,200 | $ 5,400 | $ 300 |  |  |  |  |  |  |
Evergy |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of people covered by network | people |  |  |  |  |  |  |  | 3.9 |  |  |  |  |  |  |  |
Lease term |  |  |  |  |  |  |  | 20 years |  |  | 20 years |  |  |  |  |
Scheduled prepayments |  |  |  |  |  |  |  | $ 30,200 |  |  |  |  |  |  |  |
Number of renewal options | renewalOption |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreement term |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |
Number of agreement extensions | term |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |
Agreement extension term |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Total scheduled prepayments |  |  |  |  |  | $ 80,000 |  |  |  |  |  |  |  |  |  |
Prepayments received |  |  |  |  |  |  |  |  |  |  | $ 67,100 |  |  |  | $ 8,000 |
Milestone payment received |  |  | $ 16,800 | $ 21,200 | $ 21,200 |  |  |  |  |  |  |  |  |  |  |
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayments received |  |  |  |  |  |  |  |  |  |  | $ 62,000 |  |  |  |  |
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Electricity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  | 3.7 |  |  |  |  |  |  |  |  |  |
Xcel Energy | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Natural Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer |  |  |  |  |  | 2.1 |  |  |  |  |  |  |  |  |  |
Tampa Electric Company | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreement term |  |  |  | 20 years |  |  |  |  |  |  |  |  |  |  |  |
Agreement extension term |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |
Total scheduled prepayments |  |  |  | $ 34,500 |  |  |  |  |  |  |  |  |  |  |  |
Prepayments received |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,900 |  |  |
Number of agreement extension terms | term |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |
Service area | mi² |  |  |  | 2,000 |  |  |  |  |  |  |  |  |  |  |  |

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