Insurance - Additional Information (Details) - CAD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Apr. 30, 2026 |
Apr. 30, 2025 |
Apr. 30, 2026 |
Apr. 30, 2025 |
Oct. 31, 2025 |
|
| Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] | |||||
| Onerous contract losses | $ 0.0 | $ 0.0 | $ 0.0 | $ 0.0 | |
| Insurance contracts issued | |||||
| Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] | |||||
| Contractual service margin | 20.0 | $ 13.0 | 83.0 | $ 31.0 | |
| Contractual service margin | 1,664.0 | 1,664.0 | $ 1,528.0 | ||
| Reinsurance contracts held | |||||
| Disclosure of reconciliation of changes in insurance contracts by remaining coverage and incurred claims [line items] | |||||
| Contractual service margin | $ 347.0 | $ 347.0 | $ 312.0 | ||