Contract assets/(liabilities) (Details 1) - USD ($)	6 Months Ended	12 Months Ended
Mar. 31, 2026	Sep. 30, 2025
Revenue from Contract with Customer [Abstract]
Beginning balance	$ 457,308	$ 17,414
Addition (Reversal)	454,856	434,436
Exchange rate effect	21,780	5,458
Ending balance	$ 933,944	$ 457,308

Amount of allowance for credit loss for right to consideration in exchange for good or service transferred to customer when right to consideration is unconditional.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-4

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