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Stock-Based Compensation (Tables) | 6 Months Ended
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Apr. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Summarized Activity Related to Stock Options | The following table summarizes activity related to stock options for the six months ended April 30, 2018:
|  | Number of Options |  |  | Weighted-Average Exercise Price Per Share |  |  | Aggregate Intrinsic Value |  |  | Weighted Average Remaining Term
Outstanding at October 31, 2017 |  |  | 1,922 |  |  | $ | 70.08 |  |  |  |  |  |  |
Granted |  |  | 368 |  |  | $ | 127.67 |  |  |  |  |  |  |
Exercised |  |  | (319 | ) |  | $ | 48.94 |  |  |  |  |  |  |
Forfeited or expired |  |  | (5 | ) |  | $ | 95.48 |  |  |  |  |  |  |
Outstanding at April 30, 2018 |  |  | 1,966 |  |  | $ | 84.21 |  |  | $ | 87,282 |  |  | 6.9 years
Vested or expected to vest at April 30, 2018 |  |  | 1,944 |  |  | $ | 83.83 |  |  | $ | 87,036 |  |  | 6.9 years
Exercisable at April 30, 2018 |  |  | 1,023 |  |  | $ | 65.54 |  |  | $ | 64,539 |  |  | 5.4 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:
Six months ended |  | April 30, 2018 |  |  | April 30, 2017
Expected volatility |  | 24.0%-26.7% |  |  | 26.0%-29.2%
Expected dividend yield |  | 0.97% |  |  | 0.91%-1.17%
Risk-free interest rate |  | 2.09%-2.20% |  |  | 1.89%-2.06%
Expected life of the option (in years) |  | 5.4-6.2 |  |  | 5.4-6.2
Summarized Activity Related to Restricted Stock | The following table summarizes activity related to restricted shares during the six months ended April 30, 2018:
|  | Number of Shares |  |  | Weighted-Average Grant Date Fair Value |
Restricted shares at October 31, 2017 |  |  | 58 |  |  | $ | 90.38 |
Granted |  |  | 20 |  |  | $ | 127.68 |
Vested |  |  | (23 | ) |  | $ | 84.78 |
Restricted shares at April 30, 2018 |  |  | 55 |  |  | $ | 106.33 |
Summarized Activity Related to Restricted Stock Units | The following table summarizes activity related to restricted share units during the six months ended April 30, 2018:
|  | Number of Units |  |  | Weighted-Average Grant Date Fair Value |
Restricted share units at October 31, 2017 |  |  | 0 |  |  | $ | — |
Granted |  |  | 8 |  |  | $ | 126.38 |
Restricted share units at April 30, 2018 |  |  | 8 |  |  | $ | 126.38 |
Summarized Activity Related to Director Deferred Compensation Shares | The following table summarizes activity related to director deferred compensation share equivalent units during the six months ended April 30, 2018:
|  | Number of Shares |  |  | Weighted-Average Grant Date Fair Value |
Outstanding at October 31, 2017 |  |  | 101 |  |  | $ | 46.74 |
Dividend equivalents |  |  | 1 |  |  | $ | 141.77 |
Outstanding at April 30, 2018 |  |  | 102 |  |  | $ | 47.14 |

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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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