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Accounting Policies - Useful life of property and equipment (Details)
 12 Months Ended
Oct. 31, 2021
Office equipment and computers | Minimum  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life (in years) 3 years
Office equipment and computers | Maximum  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life (in years) 5 years
Vehicles  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life (in years) 5 years
Buildings  
Disclosure of detailed information about property, plant and equipment [line items]  
Useful life (in years) 25 years