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Concentration and risks (Tables) | 6 Months Ended
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Mar. 31, 2025
Risks and Uncertainties [Abstract] |
Schedule of concentration of credit risk | (b) Concentration of customers: The following customers accounted for 10% or more of revenue for the six months ended March 31, 2024 and 2025: Schedule of concentration of credit risk
|  | 2024 |  |  | 2025 |
|  | Six Months Ended March 31, |
|  | 2024 |  |  | 2025 |
|  | RMB |  |  | RMB |
Customer A |  |  | 43,320,274 |  |  |  | 42,257,767 |
Customer B |  |  | 3,476,508 |  |  |  | 10,051,313 |
Customer C |  |  | 16,651,004 |  |  |  | 34,440,743 |
Concentration of customers amount |  |  | 16,651,004 |  |  |  | 34,440,743 |
The following customers accounted for 10% or more of the Group’s accounts receivable and amounts due from related parties as of September 30, 2024 and March 31, 2025:
|  | September 30, 2024 |  |  | March 31, 2025 |
|  | As of September 30, 2024 |  |  | As of March 31, 2025 |
|  | RMB |  |  | RMB |
Customer A |  |  | 4,525,495 |  |  |  | 3,826,469 |
Customer B |  |  | 7,055,869 |  |  |  | 6,706,071 |
Customer C |  |  | 1,748,863 |  |  |  | 1,748,863 |
Customer D |  |  | -* |  |  |  | 3,177,983 |
Concentration of customers amount |  |  | -* |  |  |  | 3,177,983 |
(c) Concentration of suppliers Below suppliers represent more than 10% of the Group’s total purchases for the six months ended March 31, 2024 and 2025:
|  | 2024 |  |  | 2025 |
|  | Six Months Ended March 31, |
|  | 2024 |  |  | 2025 |
|  | RMB |  |  | RMB |
Supplier A |  |  | -* |  |  |  | 18,600,197 |
Supplier B |  |  | -* |  |  |  | 10,377,124 |
Supplier C |  |  | -* |  |  |  | 7,641,441 |
Concentration of suppliers amount |  |  | -* |  |  |  | 7,641,441 |
* |  | Represents less than 10%

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- Definition Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-18 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 275 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482861/275-10-50-20 + Details
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