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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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