Investment Securities - Additional Information (Detail) - CAD ($) $ in Millions	3 Months Ended
Jan. 31, 2026	Oct. 31, 2025	Jan. 31, 2025
Disclosure of detailed information about financial instruments [line items]
Fair value of disposed equity securities	$ 0.0	$ 0.0	$ 1,812.0
Cumulative after-tax gain/(loss) on equity securities designated at FVOCI	0.0	0.0	539.0
Dividend income	$ 0.1	$ 1.0	$ 36.0

Fair value of investments in equity instruments designated at fair value through other comprehensive income disposed during the period.

No definition available.

+ Details

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- Definition

The cumulative gain (loss) on disposal of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: At fair value [member]; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
-Paragraph 11B
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_11B_c&doctype=Standard
-URIDate 2025-03-27

+ Details

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- Definition

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

+ References

No definition available.

+ Details

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- Definition

The amount of dividends related to investments in equity instruments that the entity has designated at fair value through other comprehensive income, held at the end of the reporting period. [Refer: Investments in equity instruments designated at fair value through other comprehensive income [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
-Paragraph 11A
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_11A_d&doctype=Standard
-URIDate 2025-03-27

+ Details

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