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Taxes - Additional information (Details) $ / shares in Units, ¥ in Millions	12 Months Ended
	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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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Per share amount effect of the income tax benefit resulting from the income tax holidays granted by taxing jurisdictions.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income (loss) exempt from income taxes.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income exempt from income tax because of a tax holiday.

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