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Income Taxes - Additional Information (Detail) - CAD ($) $ in Millions | 1 Months Ended | 3 Months Ended
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Jul. 31, 2024 | Feb. 29, 2024 | Jan. 31, 2025
Disclosure Of Income Taxes [Line Items] |  |  |
Maximum range of estimated consolidated effective tax rate |  |  | 1.00%
Estimated potential income tax reassessment exposure |  | $ 76 |
2019 Taxation Year [Member] |  |  |
Disclosure Of Income Taxes [Line Items] |  |  |
Additional income tax by denying the tax deductibility |  |  | $ 1,847
Organization For Economic Cooperation And Development Pillar Two Tax Regime [Member] |  |  |
Disclosure Of Income Taxes [Line Items] |  |  |
Global minimum tax percentage | 15.00% |  |

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- Details
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