Property, Plant, and Equipment, net - Schedule of Property, plant, and equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	$ 36,339	$ 32,380
Less: accumulated depreciation	(1,845)	(1,435)
Property, plant, and equipment, net	34,494	30,945
Property plant and equipment service
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	34,123	32,034
Equipment
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	10,083	9,794
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	592	580
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	265	249
Fiber plant
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	23,147	21,375
Towers
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	36	36
Property, plant, and equipment under construction
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	$ 2,216	$ 346