Investment Securities - Additional Information (Detail) - CAD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Apr. 30, 2026 |
Jan. 31, 2026 |
Apr. 30, 2025 |
Apr. 30, 2026 |
Apr. 30, 2025 |
|
| Disclosure of detailed information about financial instruments [line items] | |||||
| Fair value of disposed equity securities | $ 87,000 | $ 0 | $ 2,000 | $ 87,000 | $ 1,814,000 |
| Cumulative after-tax gain/(loss) on equity securities designated at FVOCI | 87,000 | 0 | 20 | 87,000 | 539,000 |
| Dividend income | $ 8,000 | $ 100 | $ 9,000 | $ 8,000 | $ 45,000 |