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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, 2026 | Mar. 31, 2025
Cash paid during the period: |  |
Taxes paid, including excise tax | $ 5,808 | $ 1,728
Operating leases paid | 2,029 | 2,311
Non-cash investing activity: |  |
Capitalized change in estimated asset retirement obligations | 55 | (107)
Network equipment provided in exchange for wireless licenses | 0 | 190
Narrowband spectrum licenses received in connection with the LCRA Agreement | 0 | 1,430
Derecognition of contingent liability related to sale of intangible assets | 21,404 | 0
Rights of use asset for new leases | 736 | 796
Rights of use asset for modifications and renewals | $ (35) | $ 1,258

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