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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentrations of risks (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Concentrations of risks |  |  |  |  |
Cash held in major financial institutions | $ 187,061 |  | $ 410,716 | $ 122,067 |
Revenue | Customer Concentration Risk | Customer A |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage | 32.90% | 43.40% | 35.60% | 43.10% |
Revenue | Customer Concentration Risk | Customer B |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage |  | 10.40% |  | 10.60% |
Revenue | Customer Concentration Risk | Customer C |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage | 13.60% |  |  |  | 14.10%
Revenue | Customer Concentration Risk | Customer D |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage | 10.20% |  |  |  | 11.70%
Revenue | Customer Concentration Risk | Customer E |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage |  |  |  |  | 11.30%
Accounts receivable | Credit Concentration Risk | Customer A |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage | 47.80% |  | 36.90% |  |
Accounts receivable | Credit Concentration Risk | Customer B |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage | 16.90% |  | 15.20% | 10.30% |
Accounts receivable | Credit Concentration Risk | Customer C |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage |  |  | 12.30% |  |
Accounts receivable | Credit Concentration Risk | Customer D |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage | 11.30% |  |  | 21.80% |
Accounts receivable | Credit Concentration Risk | Customer E |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage |  |  |  | 27.00% |
Accounts receivable | Credit Concentration Risk | Customer F |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage |  |  |  | 12.60% |
Purchase | Supplier Concentration Risk | Supplier A |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage |  | 41.50% | 28.60% |  |
Purchase | Supplier Concentration Risk | Supplier B |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage | 22.00% | 13.80% | 19.10% | 47.80% |
Purchase | Supplier Concentration Risk | Supplier C |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage | 31.70% | 13.20% |  | 12.40% |
Purchase | Supplier Concentration Risk | Supplier D |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage |  | 11.10% |  | 11.80% | 14.50%
Purchase | Supplier Concentration Risk | Supplier E |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage | 10.50% |  |  |  | 11.60%
Purchase | Supplier Concentration Risk | Supplier F |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage | 18.30% |  |  |  | 10.80%
Purchase | Supplier Concentration Risk | Supplier G |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage |  |  |  |  | 39.80%
Accounts payable | Supplier Concentration Risk | Supplier A |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage | 54.00% |  | 33.40% |  |
Accounts payable | Supplier Concentration Risk | Supplier B |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage |  |  | 11.20% |  |
Accounts payable | Supplier Concentration Risk | Supplier C |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage | 13.00% |  |  | 49.40% |
Accounts payable | Supplier Concentration Risk | Supplier D |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage |  |  |  | 23.80% |
Accounts payable | Supplier Concentration Risk | Supplier E |  |  |  |  |
Concentrations of risks |  |  |  |  |
Concentration risk percentage |  |  |  | 18.00% |

X
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