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Taxes - Reconciliation of tax rates (Details)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Taxes      
Income tax rate 25.00% 25.00% 25.00%
Effect of income tax exemption (41.01%) (27.49%) (25.34%)
Favorable tax rate impact (a) 0.33% 1.46% (0.58%)
Permanent difference (8.18%) 0.00% 0.26%
Changes of deferred tax assets valuation allowances 1.96% 5.27% 0.48%
Non-PRC entities not subject to PRC income tax 23.61% 2.84% (13.48%)
Total 1.05% 4.16% (12.50%)