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Related party transactions - Summary of Information about Key Management Personnel Remuneration (Detail) - USD ($)
6 Months Ended 12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2019
Disclosure of transactions between related parties [line items]          
Salaries $ 1,783,342 $ 539,009 $ 1,501,800 $ 231,034 $ 104,310
Share-based compensation 8,030,239 605,957 1,863,260 74,320 149,993
Fees and benefits 1,599,261 339,846 1,517,791 411,184 159,881
Total $ 11,412,842 $ 1,484,812 $ 4,882,851 $ 716,538 $ 414,184