Share-Based Payments - Additional Information (Detail) - Employee stock options [member] |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
|
Jul. 31, 2026
CAD ($)
|
Jan. 31, 2026
CAD ($)
$ / shares
|
Jul. 31, 2025
CAD ($)
|
Jul. 31, 2026
CAD ($)
|
Jul. 31, 2025
CAD ($)
|
|
| Disclosure of terms and conditions of share-based payment arrangement [line items] | |||||
| Number of share options, granted | 1,428,056 | ||||
| Exercise price of options granted | $ / shares | $ 100.35 | ||||
| Weighted average grant date fair value of options granted | $ 10.68 | ||||
| Increase (decrease) to equity | $ (1,000,000) | $ 2,000,000 | $ 9,000,000 | $ 13,000,000 | |
| Vesting period of 3 Years [member] | |||||
| Disclosure of terms and conditions of share-based payment arrangement [line items] | |||||
| Stock options vesting percentage | 50.00% | ||||
| Vesting period of 4 Years [member] | |||||
| Disclosure of terms and conditions of share-based payment arrangement [line items] | |||||
| Stock options vesting percentage | 50.00% | ||||