v3.26.1
Credit facilities (Details 1) - USD ($)
6 Months Ended 12 Months Ended
Mar. 31, 2026
Sep. 30, 2025
Defined Benefit Plan Disclosure [Line Items]    
long-term bank loans $ 668,241 $ 762,547
Huaneng Guicheng Trust [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest rate 10.44% 10.44%
long-term bank loans $ 62,130 $ 100,335