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Stock-based compensation (Tables) | 9 Months Ended
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Jul. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Summarized Activity Related to Stock Options | The following table summarizes activity related to stock options for the nine months ended July 31, 2023:
|  | Number of Options |  | Weighted- Average Exercise Price Per Share |  | Aggregate Intrinsic Value |  | Weighted Average Remaining Term
Outstanding at October 31, 2022 |  | 1,187 |  | $ | 141.82 |  |  |  |  |
Granted |  | 80 |  | 239.44 |  |  |  |  |
Exercised |  | (163) |  | 115.67 |  |  |  |  |
Forfeited or expired |  | (10) |  | 206.93 |  |  |  |  |
Outstanding at July 31, 2023 |  | 1,094 |  | $ | 151.09 |  |  | $ | 111,165 |  |  | 5.1 years
Expected to vest |  | 245 |  | $ | 214.42 |  |  | $ | 10,006 |  |  | 7.5 years
Exercisable at July 31, 2023 |  | 846 |  | $ | 132.58 |  |  | $ | 101,014 |  |  | 4.4 years
Fair Value Assumptions of Stock Options | The fair value of each option grant was estimated at the date of grant using the Black-Scholes option-pricing model with the following assumptions:
Nine Months Ended | July 31, 2023 |  | July 31, 2022
Expected volatility | 30.4% | - | 31.8% |  | 30.6% | - | 30.8%
Expected dividend yield | 1.12% | - | 1.27% |  | 0.76% | - | 0.76%
Risk-free interest rate | 3.79% | - | 4.21% |  | 1.36% | - | 1.47%
Expected life of the option (in years) | 5.0 | - | 6.2 |  | 5.3 | - | 6.2
Summarized Activity Related to Restricted Stock | The following table summarizes activity related to restricted shares during the nine months ended July 31, 2023:
|  | Number of Shares |  | Weighted-Average Grant Date Fair Value
Restricted shares at October 31, 2022 |  | 6 |  |  | $ | 167.99 |
Vested |  | (6) |  |  | 167.99
Restricted shares at July 31, 2023 |  | — |  |  | $ | — |
Summarized Activity Related to Restricted Stock Units | The following table summarizes activity related to restricted share units during the nine months ended July 31, 2023:
|  | Number of Units |  | Weighted-Average Grant Date Fair Value
Restricted share units at October 31, 2022 |  | 81 |  |  | $ | 223.77 |
Granted |  | 39 |  |  | 237.18
Forfeited |  | (5) |  |  | 241.37
Vested |  | (45) |  |  | 219.06
Restricted share units at July 31, 2023 |  | 70 |  |  | $ | 232.88 |
Summarized Activity Related to Director Deferred Compensation Shares | The following table summarizes activity related to director deferred compensation share equivalent units during the nine months ended July 31, 2023:
|  | Number of Shares |  | Weighted-Average Grant Date Fair Value
Outstanding at October 31, 2022 |  | 90 |  |  | $ | 77.70 |
Distributions |  | (13) |  |  | 52.50
Outstanding at July 31, 2023 |  | 78 |  |  | $ | 84.02 |

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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock awards granted to nonemployee directors that were outstanding at the beginning and end of the year, and the number of awards that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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