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Summary of significant accounting policies (Tables)
12 Months Ended
Sep. 30, 2018
Accounting Policies [Abstract]  
Schedule of carrying amount of this variable interest entities assets and liabilities
  September 30, 2018  September 30, 2017 
       
Current assets $481,228  $281,493 
Plant and equipment, net  71,239   37,479 
Total assets  552,467   318,972 
Total liabilities  (272,715)  (26,015)
Net assets $279,752  $292,957 
Schedule of useful lives of property plant and equipment
Machinery and equipment5 − 10 years
Transportation equipment4 years
Office equipment  3 − 5 years
Leasehold improvementShorter of lease term or useful life