Property, Plant, and Equipment, net - Schedule of Property, plant, and equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Mar. 31, 2024
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	$ 25,520	$ 313
Less: accumulated depreciation	(650)	(238)
Property, plant, and equipment, net	24,870	75
Property plant and equipment service
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	23,478	313
Equipment
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	4,380	305
Construction equipment
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	323	0
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	183	2
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	201	6
Fiber plant
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	17,536	0
Customer premise equipment
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	818	0
Towers
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	37	0
Property, plant, and equipment under construction
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, gross	$ 2,042	$ 0