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Supplemental Disclosure of Cash Flow Information - Summary of Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Cash paid during the period: |  |
Taxes paid, including excise tax | $ 1,728 | $ 70
Operating leases paid | 2,311 | 2,316
Non-cash investing activity: |  |
Capitalized change in estimated asset retirement obligations | (107) | 89
Network equipment provided in exchange for wireless licenses | 190 | 616
Narrowband spectrum licenses received in connection with the LCRA Agreement | 1,430 | 0
Deferred gain on sale of intangible assets | 0 | 4,911
Derecognition of contingent liability related to sale of intangible assets | 0 | 19,249
Rights of use asset for new leases | 796 | 645
Rights of use asset for modifications and renewals | $ 1,258 | $ 1,928

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