Related party transactions - Outstanding Balances Of Remunerations Of Directors (Details) - USD ($) |
Oct. 31, 2021 |
Oct. 31, 2020 |
Oct. 31, 2019 |
|---|---|---|---|
| Disclosure of transactions between related parties [line items] | |||
| Amounts payable, related party transactions | $ 771,255 | $ 469,761 | $ 85,386 |
| Accounts Payable And Accrued Liabilities | |||
| Disclosure of transactions between related parties [line items] | |||
| Amounts payable, related party transactions | 771,255 | 316,465 | 85,386 |
| Restricted share units | |||
| Disclosure of transactions between related parties [line items] | |||
| Amounts payable, related party transactions | $ 0 | $ 153,296 | $ 0 |