Common and Preferred Share Capital - Schedule of Common Shares Purchased and Cancelled under Previously Expired NCIB (Parenthetical) (Detail) - $ / shares	12 Months Ended
Oct. 31, 2019	Oct. 31, 2018
Common shares [member]
Disclosure of classes of share capital [line items]
Share repurchase, average price per share	$ 109.06	$ 119.22

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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