Significant accounting policies - Summary of Useful Lives of Plant and Equipment (Details) |
12 Months Ended |
|---|---|
Oct. 31, 2021 | |
| Computers | |
| Disclosure of detailed information about property, plant and equipment [line items] | |
| Useful life of plant and equipment | 3 years |
| Vehicles | |
| Disclosure of detailed information about property, plant and equipment [line items] | |
| Useful life of plant and equipment | 5 years |
| Plant equipment | |
| Disclosure of detailed information about property, plant and equipment [line items] | |
| Useful life of plant and equipment | 5 years |
| Storage containers | |
| Disclosure of detailed information about property, plant and equipment [line items] | |
| Useful life of plant and equipment | 10 years |