Property, Plant, and Equipment, net - Schedule of Property, plant, and equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Mar. 31, 2024
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	$ 32,380	$ 313
Less: accumulated depreciation	(1,435)	(238)
Property, plant, and equipment, net	30,945	75
Property plant and equipment service
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	32,034	313
Equipment
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	9,794	305
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	580	2
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	249	6
Fiber plant
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	21,375	0
Towers
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	36	0
Property, plant, and equipment under construction
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	$ 346	$ 0