Common and Preferred Shares - Schedule of Common Shares (Parenthetical) (Detail) - shares	Oct. 31, 2021	Oct. 31, 2020
Common shares [member]
Disclosure of classes of share capital [line items]
Number of shares bought and sold to facilitate trading/institutional client activity	18,532,448	20,290,297

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

No definition available.

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