Lease liabilities - Additional Information (Detail)	9 Months Ended
Jul. 31, 2021
Disclosure of quantitative information about right-of-use assets [line items]
Number of new premises leases during Period	4
Number of new equipment leases during period	1
Number of leases modified during period	3

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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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration