v3.26.1
Concentration and risks (Details Narrative)
 6 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Sep. 30, 2025
Concentration Risk [Line Items]      
Credit risk description the insurance coverage for cash deposits of each bank is RMB500,000. As of March 31, 2026, cash and restricted cash balance of RMB33,138,585 ($4,804,086) was deposited with financial institutions located in China, of which RMB31,930,936 ($4,629,014) was subject to credit risk. While management believes that these financial institutions are of high credit quality, it also continually monitors their credit worthiness.    
Revenue Benchmark [Member] | Customer One [Member]      
Concentration Risk [Line Items]      
concentration risk 31.10% 27.00%  
Revenue Benchmark [Member] | Customer Two [Member]      
Concentration Risk [Line Items]      
concentration risk 28.00% 22.60%  
Revenue Benchmark [Member] | Customer Three [Member]      
Concentration Risk [Line Items]      
concentration risk 13.90% 16.10%  
Revenue Benchmark [Member] | Vendor One [Member]      
Concentration Risk [Line Items]      
concentration risk 53.00% 57.20%  
Accounts Receivable [Member] | Customer One [Member]      
Concentration Risk [Line Items]      
concentration risk 13.90%   22.90%
Accounts Receivable [Member] | Customer Two [Member]      
Concentration Risk [Line Items]      
concentration risk 11.00%   11.50%
Accounts Receivable [Member] | Customer Three [Member]      
Concentration Risk [Line Items]      
concentration risk 10.10%    
Accounts Payable [Member] | Vendor One [Member]      
Concentration Risk [Line Items]      
concentration risk 10.80% 40.60%  
Accounts Payable [Member] | Vendor Two [Member]      
Concentration Risk [Line Items]      
concentration risk 10.80%