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Intangible Assets - Narrative (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2023 USD ($) county | Dec. 31, 2022 USD ($) county | Mar. 31, 2023 USD ($)
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Impairment | $ 0 |  | $ 0 | $ 0 | $ 0 |
Broadband licenses granted, number of counties | county |  |  |  | 24 | 70 |
Exchanges – licenses received |  |  |  | $ 41,250,000 | $ 13,107,000 |
Licenses exchanged |  |  |  | 8,215,000 | 3,778,000 |
Gain on disposal of intangible assets, net | (13,700,000) |  | (5,800,000) | (33,000,000) | (9,300,000) |
Sale of intangible assets |  |  |  | 25,427,000 | 0 |
Gain on sale of intangible assets, net | 32,000 |  | 0 | 7,364,000 | 0 |
Deferred gain on sale of intangible assets | 4,911,000 |  | $ 0 | 4,911,000 | 0 | $ 0
SDG&E | Collaborative Arrangement, Transaction with Party to Collaborative Arrangement |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Delivery delay adjustments |  | $ 1,100,000 |  |  |  |
Licensing Agreements |  |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Exchanges – licenses received |  |  |  | 41,300,000 | 13,100,000 |
Licenses exchanged |  |  |  | $ 8,200,000 | $ 3,800,000 |
Sale of intangible assets | 700,000 | 44,000,000 |  |  |  |
Reduction of intangible assets | 600,000 | 31,800,000 |  |  |  |
Gain on sale of intangible assets, net | $ 32,000 | $ 7,300,000 |  |  |  |

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