Summary of significant accounting policies (Details) |
6 Months Ended |
|---|---|
Mar. 31, 2026 | |
| Machinery and equipment | Minimum | |
| Property plant and equipment useful life | 5 years |
| Machinery and equipment | Maximum | |
| Property plant and equipment useful life | 10 years |
| Transportation equipment | |
| Property plant and equipment useful life | 4 years |
| Office equipment | Minimum | |
| Property plant and equipment useful life | 3 years |
| Office equipment | Maximum | |
| Property plant and equipment useful life | 5 years |