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Summary of significant accounting policies - Additional information (Details) ¥ in Millions |  |  | 12 Months Ended | 41 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 01, 2019 | Apr. 30, 2018 | Sep. 30, 2026 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) ¥ / $ | Sep. 30, 2020 USD ($) ¥ / $ | Sep. 30, 2019 USD ($) ¥ / $ | Sep. 30, 2021 USD ($) ¥ / $ | Sep. 30, 2021 CNY (¥) ¥ / $ | Oct. 01, 2019 USD ($) | Sep. 30, 2018 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distribute percentage of earnings after eliminating Variable interest entity accumulated losses |  |  |  |  |  |  |  | 95.00% |  |  |  |  |  |
Percentage of Variable interest entity after tax net income gain loss |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |
Percentage of service fee is subject value added sales tax |  |  |  |  |  |  |  | 6.00% |  |  |  |  |  |
Percentage of service fee is subject value added other taxe |  |  |  |  |  |  |  | 12.00% |  |  |  |  |  |
Percentage of service fee is subject value added tax |  |  |  |  |  |  |  | 6.00% |  |  | 6.00% | 6.00% |  |
Subject to corporate income tax maximum percentage of net income loss |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |
Restricted cash |  |  |  |  |  |  |  | $ 0 | $ 1,617,000 |  | $ 0 |  |  |
Restricted cash utilized |  |  |  |  |  |  |  |  | 1,617,000 |  |  |  |  |
Cash, FDIC insured amount |  |  |  |  |  |  |  | 77,599 |  |  | 77,599 | ¥ 0.5 |  |
Allowance for doubtful accounts |  |  |  |  |  |  |  | 8,094 | 119,199 | $ 0 | 8,094 |  |  | $ 0
Inventory reserve |  |  |  |  |  |  |  | 0 | 18,442 |  | 0 |  |  |
Allowance for doubtful debts relating to advances to suppliers |  |  |  |  |  |  |  | 0 | 723,655 |  |  |  |  |
Impairment of long-lived assets |  |  |  |  |  |  |  | 0 | 0 | 0 |  |  |  |
Amortization expenses |  |  | $ 0 | $ 0 | $ 0 | $ 7,449 | $ 32,626 | 46,085 | 42,758 | $ 3,539 |  |  |  |
Contract liabilities, current |  |  |  |  |  |  |  | 12,177 | 1,160 |  | 12,177 |  |  |
Cash maintained with People's Republic of China |  |  |  |  |  |  |  | 3,985,359 | 1,964,958 |  | 3,985,359 |  |  |
Cash equivalents |  |  |  |  |  |  |  | 77,599 |  |  | 77,599 | ¥ 0.5 |  |
Operating lease liabilities |  |  |  |  |  |  |  | 761,325 | 248,888 |  | 761,325 |  | $ 300,000 |
ROU assets |  |  |  |  |  |  |  | $ 776,665 | $ 278,396 |  | $ 776,665 |  | $ 300,000 |
Exchange rates (per RMB1) | ¥ / $ |  |  |  |  |  |  |  | 0.1552 | 0.1470 |  | 0.1552 | 0.1552 |  |
Average exchange rates | ¥ / $ |  |  |  |  |  |  |  | 0.1540 | 0.1427 | 0.1454 |  |  |  |
Applicable VAT rate |  | 13% or 17% |  |  |  |  |  |  |  |  |  |  |  |
Tax Rate | 9% or 13% |  |  |  |  |  |  |  |  |  | 12% or 16% |  |  |
Investment Interest Rate |  |  |  |  |  |  |  | 2.00% |  |  | 2.00% | 2.00% |  |
Short-term deposit |  |  |  |  |  |  |  | $ 2,793,556 | $ 0 |  | $ 2,793,556 |  |  |
Shipping and handling |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shipping and handling expenses |  |  |  |  |  |  |  | $ 235,956 | $ 202,171 | $ 233,543 |  |  |  |

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