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Segment information (Details) - USD ($)
 6 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Revenue from External Customer [Line Items]    
Total revenues $ 8,748,945 $ 2,858,544
Total cost of revenues 8,260,142 2,032,050
Total gross profit 488,803 826,494
Projects [Member]    
Revenue from External Customer [Line Items]    
Total revenues 8,148,629 1,756,987
Total cost of revenues 7,743,337 1,140,400
Total gross profit 405,292 616,587
Products [Member]    
Revenue from External Customer [Line Items]    
Total revenues 471,144 978,015
Total cost of revenues 400,783 767,953
Total gross profit 70,361 210,062
Services [Member]    
Revenue from External Customer [Line Items]    
Total revenues 129,172 123,542
Total cost of revenues 116,022 123,697
Total gross profit $ 13,150 $ (155)