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Intangible Assets - Narrative (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) county | Sep. 30, 2022 USD ($) county | Mar. 31, 2023 USD ($)
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Impairment |  |  | $ 0 |  |
Broadband licenses granted, number of counties | county |  |  | 14 | 45 |
Gain on disposal of intangible assets, net | $ (8,500,000) | $ (2,900,000) | $ (19,300,000) | $ (3,600,000) |
Sale of intangible assets |  |  | 25,178,000 | 0 |
Gain on sale of intangible assets, net | 7,332,000 | 0 | 7,332,000 | 0 |
Deferred gain on sale of intangible assets | 4,889,000 | $ 0 | 4,889,000 | 0 | $ 0
Wireless Licenses |  |  |  |  |
Acquired Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |
Exchanges – licenses received |  |  | 24,146,000 | 4,900,000 |
Licenses exchanged |  |  | 4,848,000 | $ (1,300,000) |
Sale of intangible assets |  |  | 44,000,000 |  |
Reduction of intangible assets |  |  | 31,800,000 |  |
Gain on sale of intangible assets, net | $ 7,300,000 |  | $ 7,300,000 |  |

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