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Advances to suppliers (Details) - USD ($)
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Supplies [Roll Forward]    
Beginning balance $ 4,112,915 $ 3,716,616
Increased during the year 32,093,609 31,168,473
Less: utilized during the year (30,209,196) (30,780,733)
Exchange difference (128,842) 8,559
Ending balance $ 5,868,486 $ 4,112,915