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Concentration of major customers and suppliers (Detail Textuals)
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Customer concentration risk | Major customer one | Total sales      
Major Customers And Suppliers [Line Items]      
Concentration risk, percentage 68.00% 76.00% 80.00%
Customer concentration risk | Major customer one | Accounts receivable      
Major Customers And Suppliers [Line Items]      
Concentration risk, percentage 96.00% 67.00%  
Customer concentration risk | Major customer two | Accounts receivable      
Major Customers And Suppliers [Line Items]      
Concentration risk, percentage   29.00%  
Supplier concentration risk | Major supplier one | Advances to suppliers      
Major Customers And Suppliers [Line Items]      
Concentration risk, percentage 54.00% 62.00%  
Supplier concentration risk | Major supplier one | Total purchases      
Major Customers And Suppliers [Line Items]      
Concentration risk, percentage 54.00% 60.00% 57.00%
Supplier concentration risk | Major supplier two | Advances to suppliers      
Major Customers And Suppliers [Line Items]      
Concentration risk, percentage 42.00% 37.00%  
Supplier concentration risk | Major supplier two | Total purchases      
Major Customers And Suppliers [Line Items]      
Concentration risk, percentage 27.00% 20.00% 30.00%