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Concentration of risk (Details Narrative)	3 Months Ended		6 Months Ended
Concentration of risk (Details Narrative)	Mar. 31, 2026 USD ($)	Mar. 31, 2025	Mar. 31, 2026 USD ($)	Mar. 31, 2025	Mar. 31, 2026 HKD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2025 HKD ($)
Concentration Risk [Line Items]
Cash	$ 1,118,600		$ 1,118,600			$ 420,086
Cash uninsured limit	855,187		855,187		$ 409,698	156,849	$ 327,428
Deposits	741,076		741,076			560,795
Accounts receivable
Accounts payable
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Three Customers [Member]
Concentration Risk [Line Items]
Concentration risk percentage	100.00%			99.70%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Four Customers [Member]
Concentration Risk [Line Items]
Concentration risk percentage			100.00%
Customer Concentration Risk [Member] \| Revenue Benchmark [Member] \| Two Customers [Member]
Concentration Risk [Line Items]
Concentration risk percentage		100.00%
Supplier Concentration Risk [Member] \| Cost of Goods and Service Benchmark [Member] \| Two Suppliers [Member]
Concentration Risk [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%	100.00%
Maximum [Member]
Concentration Risk [Line Items]
Cash FDIC insurance limit	$ 250,000		$ 250,000		$ 800,000