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Taxes (Details) ¥ in Thousands, $ in Thousands	6 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2024 CNY (¥)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Taxes [Line Items]
Statutory income tax rate percentage	25.00%
Net operating losses carried forward	$ 4,690,704
Unrecognized tax benefits	$ 2,806,694		$ 2,639,258	$ 2,573,830
Underpayment of taxes | ¥		¥ 100
Hong Kong [Member]
Taxes [Line Items]
Statutory income tax rate percentage	16.50%
Foreign Investment Enterprises [Member]
Taxes [Line Items]
Foreign income tax rate	25.00%

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

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