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Share-Based Payments - Schedule of Bank's Employee Stock Option Plan (Detail) - Employee stock options [member] shares in Thousands | 12 Months Ended
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Oct. 31, 2025 shares $ / shares | Oct. 31, 2024 shares $ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Number of options, outstanding at beginning of year | 11,456 | 11,558
Number of options, granted | 1,587 | 2,676
Number of options, exercised | (2,710) | (498)
Number of options, forfeited | (85) | (600)
Number of options, expired | (161) | (1,680)
Number of options, outstanding at end of year | 10,087 | 11,456
Exercisable at end of year | 3,333 | 4,737
Number of options, available for grant | 10,562 | 11,902
Weighted average exercise price, outstanding at beginning of year | $ / shares | $ 70.75 | $ 72.74
Weighted average exercise price, granted | $ / shares | 79.13 | 59.99
Weighted average exercise price, exercised as options | $ / shares | 72.21 | 66.04
Weighted average exercise price, forfeited | $ / shares | 70.66 | 70.34
Weighted average exercise price, expired | $ / shares | 72.62 | 68.84
Weighted average exercise price, outstanding at end of year | $ / shares | 71.65 | 70.75
Weighted average exercise price, exercisable at end of year | $ / shares | $ 75.39 | $ 73.1

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- Definition The number of share options outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 45 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45_d&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45_b_i&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45_b_vi&doctype=Standard -URIDate 2024-03-27 + Details
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