Contract liabilities - Schedule of Movements of Contract Liabilities (Details) - USD ($)	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025
Schedule Of Movements Of Contract Liabilities Abstract
Beginning of the year	$ 65,464	$ 208,726
Add: Payments received	178,636	65,260
Less: Revenue recognized	(65,464)	(208,271)
Effects of foreign exchange rate changes	0	(251)
End of the year	$ 178,636	$ 65,464

Current liabilities attributable to energy marketing activities (trading activities). Current energy marketing (trading activities) are when entities engage in both financial and physical trading to increase profits, manage their commodity price risk and enhance system reliability. They may trade electricity, coal, natural gas and oil. These entities typically use a variety of financial instruments, including forward contracts, options and swaps.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(20))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Name:	us-gaap_EnergyMarketingContractLiabilitiesCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant