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Income Taxes - Additional Information (Detail) - CAD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2024 | Oct. 31, 2025 | Oct. 31, 2024 | Oct. 31, 2023
Disclosure Of Income Taxes [Line Items] |  |  |  |
Net deferred tax assets |  | $ 980 | $ 772 | $ 607
Deferred tax assets |  | 1,027 | 821 |
Deferred tax liabilities |  | 47 | 49 |
Unused tax losses for which deferred tax assets have not been recognized |  | 598 | 735 |
Foreign exchange loss |  | $ 76 |  |
Tax rate |  | 1.00% |  |
Deferred tax operating loss carryforwards |  | $ 13 | 12 |
2020 Taxation Year [Member] |  |  |  |
Disclosure Of Income Taxes [Line Items] |  |  |  |
Additional income tax by denying the tax deductibility |  | 1,918 |  |
Organization For Economic Cooperation And Development Pillar Two Tax Regime [Member] |  |  |  |
Disclosure Of Income Taxes [Line Items] |  |  |  |
Global minimum tax percentage | 15.00% |  |  |
Caribbean [member] |  |  |  |
Disclosure Of Income Taxes [Line Items] |  |  |  |
Unused tax losses for which deferred tax assets have not been recognized |  | 538 | 732 |
Deferred tax operating loss carryforwards |  | $ 5 |  |
Caribbean [member] | Top of range [member] |  |  |  |
Disclosure Of Income Taxes [Line Items] |  |  |  |
Unused tax losses for which deferred tax assets have not been recognized, expiration period |  | 10 |  |
Caribbean [member] | Bottom of range [member] |  |  |  |
Disclosure Of Income Taxes [Line Items] |  |  |  |
Unused tax losses for which deferred tax assets have not been recognized, expiration period |  | 7 |  |
Canada [member] |  |  |  |
Disclosure Of Income Taxes [Line Items] |  |  |  |
Unused tax losses for which deferred tax assets have not been recognized |  | $ 482 | 482 |
Deferred tax operating loss carryforwards |  | 7 |  |
US [member] |  |  |  |
Disclosure Of Income Taxes [Line Items] |  |  |  |
Unused tax losses for which deferred tax assets have not been recognized |  | 60 | $ 3 |
Deferred tax operating loss carryforwards |  | $ 1 |  |

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- Definition The amounts of income taxes recoverable in future periods in respect of: (a) deductible temporary differences; (b) the carryforward of unused tax losses; and (c) the carryforward of unused tax credits. [Refer: Temporary differences [member]; Unused tax credits [member]; Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2024-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=12&code=ifrs-tx-2024-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 54 -Subparagraph o -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_o&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 56 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_56&doctype=Standard -URIDate 2024-03-27 + Details
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