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v3.23.1

Nature of Operations (Details) $ / shares in Units, $ in Thousands, people in Millions, customer in Millions |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 28, 2022 USD ($) customer term | May 30, 2022 shares | May 18, 2022 $ / shares shares | Sep. 15, 2014 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) people | Feb. 28, 2021 USD ($) people | Dec. 31, 2020 USD ($) people | Mar. 31, 2023 USD ($) county | Mar. 31, 2022 USD ($) county | Mar. 31, 2021 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2014 USD ($)
Lessor, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayments received |  |  |  |  |  |  |  |  | $ 60,759 | $ 54,678 | $ 2,983 |  |  |
Number of people covered by network | people |  |  |  |  |  |  | 3.6 | 7.5 |  |  |  |  |  |
Lease term |  |  |  |  |  |  |  | 30 years |  |  |  |  |  |
Lease extension |  |  |  |  |  | 10 years |  | 10 years |  |  |  |  |  |
Scheduled prepayments |  |  |  |  |  |  |  | $ 47,700 |  |  |  |  |  |
Broadband licenses granted, number of countries | county |  |  |  |  |  |  |  |  | 84 | 21 |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | $ 1,919 | $ 1,084 | 921 |  |  |
Contingent liability |  |  |  |  |  |  | $ 20,000 |  | 0 | 20,000 |  |  |  |
Sale of stock (in shares) | shares |  | 500,000 | 500,000 |  |  |  |  |  |  |  |  |  |  |
Shares converted (in shares) | shares |  |  | 500,000 |  |  |  |  |  |  |  |  |  |  |
Prepaid expenses and other current assets |  |  |  |  |  |  |  |  | $ 16,277 | 10,147 |  |  |  |
Conversion price (in dollars per share) | $ / shares |  |  | $ 20.00 |  |  |  |  |  |  |  |  |  |  |
Common Class B Units | PDV Spectrum Holding Company, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity method investee, cumulative proceeds received on all transactions |  |  |  | $ 10,000 |  |  |  |  |  |  |  |  |  |
Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent liability |  |  |  |  |  |  |  |  |  |  |  | $ 30,000 |  |
SDG&E |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  |  |  |  | $ 50,000 |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease extension |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |
Spectrum revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | $ 1,919 | 1,084 | 729 |  |  |
Prepaid expenses and other current assets |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,500
Xcel Energy Services Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreement term | 20 years |  |  |  |  |  |  |  |  |  |  |  |  |
Number of agreement extensions | term | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Agreement extension term | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
Total scheduled prepayments | $ 80,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Prepayments received |  |  |  |  |  |  |  |  | $ 8,000 |  |  |  | $ 8,000 |
Xcel Energy Services Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Electricity |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer | 3.7 |  |  |  |  |  |  |  |  |  |  |  |  |
Xcel Energy Services Inc. | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement | Natural Gas |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers | customer | 2.1 |  |  |  |  |  |  |  |  |  |  |  |  |
Evergy |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of people covered by network | people |  |  |  |  |  | 3.9 |  |  |  |  |  |  |  |
Lease term |  |  |  |  |  | 20 years |  |  |  |  |  |  |  |
Scheduled prepayments |  |  |  |  |  | $ 30,200 |  |  |  |  |  |  |  |
Broadband licenses granted, number of countries | county |  |  |  |  |  |  |  |  | 81 |  |  |  |  |
Evergy | Spectrum revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total operating revenues |  |  |  |  |  |  |  |  | $ 581 | $ 0 | $ 0 |  |  |
SDG&E | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lessor, Lease, Description [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Milestone payment received |  |  |  |  | $ 200 |  |  |  |  |  |  |  |  |

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