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Taxes - Additional information (Details) $ / shares in Units, ¥ in Millions | 12 Months Ended
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Sep. 30, 2021 CNY (¥) | Sep. 30, 2021 USD ($) $ / shares | Sep. 30, 2020 USD ($) $ / shares | Sep. 30, 2019 USD ($) $ / shares
Operating Loss Carryforwards [Line Items] |  |  |  |
Corporate income tax at a statutory rate | 25.00% | 25.00% | 25.00% | 25.00%
Net income exempt from income tax |  | $ 4,020,000.00 | $ 3,840,000 | $ 3,590,000
Tax savings from tax break |  | $ 1,004,365 | $ 960,097 | $ 898,597
Per share effect of the tax exemption | $ / shares |  | $ 0.01 | $ 0.06 | $ 0.08
Cumulative net operating loss |  | $ 54,000 |  |
Valuation allowance |  | $ 13,569 | $ 0 |
Scenario of Taxable Income Between One Million And Three Million |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Corporate income tax at a statutory rate | 10.00% | 10.00% |  |
Scenario of Taxable Income Not More Than One Million |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Corporate income tax at a statutory rate | 5.00% | 5.00% |  |
Minimum |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Corporate income tax at a statutory rate | 5.00% | 5.00% |  |
Threshold Taxable Income For Determining Tax Rate | ¥ | ¥ 1 |  |  |
Minimum | Scenario of Taxable Income Not More Than One Million |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Threshold Taxable Income For Determining Tax Rate | ¥ | 1 |  |  |
Maximum | Scenario of Taxable Income Between One Million And Three Million |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Threshold Taxable Income For Determining Tax Rate | ¥ | ¥ 3 |  |  |

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