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Supplemental Disclosure of Cash Flow Information - Summary of Supplemental Cash Flow Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
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