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Share-based payments (Tables) | 12 Months Ended
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Oct. 31, 2025
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Summary of Stock Option Activity and Related Information | The following tables summarize the activities of the stock options and provide additional details related to stock options outstanding and vested.
As at or for the year ended October 31 |  |  |  |  | 2025 |  |  |  |  |  | 2024 |
|  | Number of stock options |  |  | Weighted- average exercise price (1) |  |  | Number of stock options |  |  | Weighted- average exercise price |
Outstanding at beginning of year |  |  | 15,967,581 |  |  | $ | 58.55 |  |  |  | 14,688,079 |  |  | $ | 58.47 |
Granted |  |  | 2,422,512 |  |  |  | 94.35 |  |  |  | 3,973,361 |  |  |  | 56.55 |
Exercised (2) |  |  | (2,824,550 | ) |  |  | 54.71 |  |  |  | (2,593,751 | ) |  |  | 52.72 |
Forfeited/cancelled/expired |  |  | (44,171 | ) |  |  | 66.86 |  |  |  | (100,108 | ) |  |  | 60.44 |
Outstanding at end of year |  |  | 15,521,372 |  |  | $ | 64.81 |  |  |  | 15,967,581 |  |  | $ | 58.55 |
Exercisable at end of year |  |  | 4,508,217 |  |  | $ | 58.94 |  |  |  | 5,033,423 |  |  | $ | 55.17 |
Available for grant |  |  | 4,427,783 |  |  |  |  |  |  |  | 6,806,124 |  |  |  |  |
(1) | For foreign currency-denominated options granted and exercised during the year, the weighted-average exercise prices are converted using exchange rates as at the grant date and settlement date, respectively. The weighted-average exercise price of outstanding balances as at October 31, 2025 reflects the conversion of foreign currency-denominated options at the year-end exchange rate.
(2) | The weighted-average share price at the date of exercise was $96.04 (2024: $65.04).
Summary of Stock Options Outstanding and Vested |
As at October 31, 2025 |  | Stock options outstanding |  |  |  |  |  | Stock options vested |
Range of exercise prices |  | Number outstanding |  |  | Weighted- average contractual life remaining |  |  | Weighted- average exercise price |  |  |  |  |  | Number outstanding |  |  | Weighted- average exercise price |
$1.00 – $50.00 |  |  | 29,118 |  |  |  | 0.21 |  |  | $ | 39.44 |  |  |  |  |  |  |  | 29,118 |  |  | $ | 39.44 |
$50.01 – $60.00 |  |  | 10,327,462 |  |  |  | 6.59 |  |  |  | 57.10 |  |  |  |  |  |  |  | 2,988,762 |  |  |  | 55.22 |
$60.01 – $70.00 |  |  | 484,573 |  |  |  | 2.12 |  |  |  | 60.01 |  |  |  |  |  |  |  | 484,573 |  |  |  | 60.01 |
$70.01 – $80.00 |  |  | 2,266,832 |  |  |  | 6.09 |  |  |  | 70.05 |  |  |  |  |  |  |  | 1,005,764 |  |  |  | 70.05 |
$90.01 – $100.00 |  |  | 2,413,387 |  |  |  | 9.10 |  |  |  | 94.35 |  |  |  |  |  |  |  | – |  |  |  | 94.35 |
Total |  |  | 15,521,372 |  |  |  | 6.75 |  |  | $ | 64.84 |  |  |  |  |  |  |  | 4,508,217 |  |  | $ | 58.94 |
Summary of Assumptions Used to Determine Fair Value of Options Granted | The following weighted-average assumptions were used as inputs into the Black-Scholes option pricing model to determine the fair value of options on the date of grant:
For the year ended October 31 |  | 2025 |  |  | 2024 |
Weighted-average assumptions |  |  |  |  |  |  |  |
Risk-free interest rate |  |  | 2.66 | % |  |  | 3.74 | %
Expected dividend yield |  |  | 4.65 | % |  |  | 7.50 | %
Expected share price volatility |  |  | 15.60 | % |  |  | 19.47 | %
Expected life |  |  | 6 years |  |  |  | 6 years |
Share price/exercise price |  | $ | 94.35 |  |  | $ | 56.55 |

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- Definition The disclosure of information about indirect, by reference to the fair value of the equity instruments granted, measurement of the fair value of goods or services received as consideration for the entity's share options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_a&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The disclosure of the number and weighted average exercise prices of share options. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 45 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45_b&doctype=Standard -URIDate 2024-03-27 + Details
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