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Advances to Suppliers, Net (Tables)
 12 Months Ended
Sep. 30, 2021
Major Suppliers [Abstract]  
Schedule of advances to suppliers and allowance for doubtful accounts
   As of September 30, 
   2020   2021 
Prepayment for purchase of e-bicycles materials  $956,192   $4,094,894 
Prepayment for purchase of battery packs   1,584,605    2,953,616 
Prepayment for purchase of battery cells for trading business   84,354    
-
 
Prepayment for service fees related to e-bicycles manufacturing licenses   120,936    
-
 
Others   38,650    444,444 
    2,784,737    7,492,954 
Less: allowance for doubtful accounts   (84,354)   (88,416)
Advances to suppliers, net  $2,700,383   $7,404,538