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Credit facilities (Details) - USD ($)
6 Months Ended 12 Months Ended
Mar. 31, 2025
Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items]    
Short term loans banks $ 2,487,357 $ 1,859,610
Bankof China [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest rate 3.10% 3.45%
Short term loans banks $ 689,019 $ 427,497
Bankof China 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest rate 3.10%  
Short term loans banks $ 413,411  
Bankof Chengdu [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest rate 3.60% 4.00%
Short term loans banks $ 150,206 $ 155,324
Bankof Chengdu 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest rate 3.60% 4.00%
Short term loans banks $ 413,411 $ 427,497
Rural Commercial Bankof China [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest rate 4.00% 4.00%
Short term loans banks $ 275,607 $ 284,998
Industrialand Commercial Bankof China [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Interest rate 3.45% 3.45%
Short term loans banks $ 545,703 $ 564,294