v3.26.1
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentrations of risks (Details) - USD ($)
6 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Sep. 30, 2025
Concentrations of risks      
Cash held in major financial institutions $ 235,512   $ 187,061
Revenue | Customer Concentration Risk | Customer A      
Concentrations of risks      
Concentration risk percentage   32.90%  
Revenue | Customer Concentration Risk | Customer B      
Concentrations of risks      
Concentration risk percentage 22.60%    
Revenue | Customer Concentration Risk | Customer C      
Concentrations of risks      
Concentration risk percentage   13.60%  
Revenue | Customer Concentration Risk | Customer D      
Concentrations of risks      
Concentration risk percentage   10.20%  
Accounts receivable | Credit Concentration Risk | Customer A      
Concentrations of risks      
Concentration risk percentage 26.00%   33.20%
Accounts receivable | Credit Concentration Risk | Customer B      
Concentrations of risks      
Concentration risk percentage     11.20%
Accounts receivable | Credit Concentration Risk | Customer C      
Concentrations of risks      
Concentration risk percentage     10.30%
Accounts receivable | Credit Concentration Risk | Customer D      
Concentrations of risks      
Concentration risk percentage 12.00%   12.70%
Purchase | Supplier Concentration Risk | Supplier A      
Concentrations of risks      
Concentration risk percentage   22.00%  
Purchase | Supplier Concentration Risk | Supplier B      
Concentrations of risks      
Concentration risk percentage 21.60% 31.70%  
Purchase | Supplier Concentration Risk | Supplier C      
Concentrations of risks      
Concentration risk percentage   10.50%  
Purchase | Supplier Concentration Risk | Supplier D      
Concentrations of risks      
Concentration risk percentage   18.30%  
Purchase | Supplier Concentration Risk | Supplier E      
Concentrations of risks      
Concentration risk percentage 21.90%    
Purchase | Supplier Concentration Risk | Supplier F      
Concentrations of risks      
Concentration risk percentage 23.80%    
Accounts payable | Supplier Concentration Risk | Supplier A      
Concentrations of risks      
Concentration risk percentage 28.60%   40.00%
Accounts payable | Supplier Concentration Risk | Supplier B      
Concentrations of risks      
Concentration risk percentage 20.20%    
Accounts payable | Supplier Concentration Risk | Supplier G      
Concentrations of risks      
Concentration risk percentage     25.40%
Accounts payable | Supplier Concentration Risk | Supplier H      
Concentrations of risks      
Concentration risk percentage 10.10%