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IFRS 7 Disclosure - Market Risk - Additional Information (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Oct. 31, 2025 | Oct. 31, 2024
Disclosure of Risk Management [Line Items] |  |
Amount Of Increase Decrease In Before Tax Annual Earning Net Of Hedging | $ 396.0 | $ 324.0
Amount Of Increase Decrease In Before Tax Annual Earning Without Hedging | 40.0 | 45.0
Pre Tax Net Interest Income | 236.0 |
Market risk [member] | Value at Risk [Member] |  |
Disclosure of Risk Management [Line Items] |  |
Market risk capital | $ 13.6 | $ 14.9
Percentage Of Probability Losses On Value At Risk | 1.00% |
Statistical Technique Percentage of Confidence Level To Value At Risk On Trading Portfolios | 99.00% |
Value At Risk Holding Period | 1 day |
Bottom of range [member] |  |
Disclosure of Risk Management [Line Items] |  |
Pre Tax Net Interest Income | $ 102.0 |
Top of range [member] |  |
Disclosure of Risk Management [Line Items] |  |
Pre Tax Net Interest Income | $ 236.0 |

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- Definition The measure of a potential loss exposure as a result of future market movements, based on a specified confidence interval and measurement horizon. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 41 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_41&doctype=Standard -URIDate 2024-03-27 + Details
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