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Taxes (Details)
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Abstract]      
Statutory PRC income tax rate 25.00% 25.00% 25.00%
Effect of income tax exemption on certain income (25.04%) (23.99%) (20.33%)
Permanent difference 0.00% 0.01% 0.05%
Changes of deferred tax assets valuation allowances 0.27% (0.86%) 5.72%
Non-PRC entities not subject to PRC income tax 0.05% 0.02% 0.00%
Total 0.28% 0.18% 10.44%