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Concentration of major customers and suppliers (Detail Textuals) | 12 Months Ended
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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%

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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