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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |
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Aug. 10, 2020 $ / shares shares | Jun. 17, 2020 $ / shares shares | May 11, 2020 $ / shares shares | Apr. 22, 2020 item $ / shares shares | Dec. 18, 2019 $ / shares shares | Dec. 14, 2018 $ / shares shares | Dec. 18, 2017 $ / shares shares | Jan. 31, 2020 director $ / shares shares | Jan. 31, 2019 director $ / shares shares | Jan. 31, 2018 director $ / shares shares | Dec. 31, 2020 USD ($) shares | Oct. 31, 2020 USD ($) item $ / shares shares | Oct. 31, 2019 USD ($) | Oct. 31, 2018 USD ($) | Apr. 30, 2011 shares
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of officers | item |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |
Stock-based compensation expense | $ |  |  |  |  |  |  |  |  |  |  |  | $ 4,500 | $ 3,600 | $ 4,600 |
Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ |  |  |  |  |  |  |  |  |  |  |  | 4,500 | 3,600 |  |
Restricted Stock [Member] | Chief Operating Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted shares granted | 4,568 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock closing price awarded (in dollars per share) | $ / shares | $ 65.67 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ |  |  |  |  |  |  |  |  |  |  | $ 100 |  |  |  |
Annual incremental vesting percentage | 33.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock [Member] | Chief Financial Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted shares granted |  |  | 5,418 |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock closing price awarded (in dollars per share) | $ / shares |  |  | $ 55.37 |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |
Annual incremental vesting percentage |  |  | 33.00% |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock [Member] | Chief Executive Officer [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted shares granted |  | 13,053 |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock closing price awarded (in dollars per share) | $ / shares |  | $ 76.61 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ |  |  |  |  |  |  |  |  |  |  | 200 |  |  |  |
Annual incremental vesting percentage |  | 33.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock [Member] | Former Officers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of officers | item |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |
Restricted shares granted |  |  |  | 18,324 |  |  |  |  |  |  |  |  |  |  |
Restricted stock closing price awarded (in dollars per share) | $ / shares |  |  |  | $ 61.09 |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ |  |  |  |  |  |  |  |  |  |  | $ 1,100 |  |  |  |
Restricted Stock [Member] | Non-employee directors [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted shares granted |  |  |  |  |  |  |  | 18,000 | 21,000 | 21,000 |  |  |  |  |
Restricted stock closing price awarded (in dollars per share) | $ / shares |  |  |  |  |  |  |  | $ 87.21 | $ 71.56 | $ 85.90 |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 1 year | 1 year | 1 year |  |  |  |  |
Stock-based compensation expense | $ |  |  |  |  |  |  |  |  |  |  |  | 1,600 | 1,600 |  |
Number of non-employee directors | director |  |  |  |  |  |  |  | 12 | 12 | 12 |  |  |  |  |
Restricted shares granted per non-employee |  |  |  |  |  |  |  | 1,500 | 1,750 | 1,750 |  |  |  |  |
Restricted Stock [Member] | Executive officers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted shares granted |  |  |  |  | 31,158 | 14,522 | 25,241 |  |  |  |  |  |  |  |
Restricted stock closing price awarded (in dollars per share) | $ / shares |  |  |  |  | $ 87.63 | $ 85.67 | $ 75.45 |  |  |  |  |  |  |  |
Stock-based compensation expense | $ |  |  |  |  |  |  |  |  |  |  |  | $ 1,400 | $ 2,000 |  |
Annual incremental vesting percentage |  |  |  |  | 33.00% | 33.00% | 33.00% |  |  |  |  |  |  |  |
2005 Stock Incentive Plan [Member] | Stock Options [Member] | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  | 1 year |  |  |
Expiration period, after grant date |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |
2005 Stock Incentive Plan [Member] | Stock Options [Member] | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Expiration period, after grant date |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |  |
2011 Management Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares authorized under plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000
2011 Management Incentive Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted shares granted |  |  |  |  |  |  |  |  |  |  |  | 72 |  |  |
Restricted stock closing price awarded (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 81.19 |  |  |
Forfeited, Number of Shares |  |  |  |  |  |  |  |  |  |  | 14 |  |  |  |
Vested, Number of Shares |  |  |  |  |  |  |  |  |  |  |  | 51 |  |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan) per non-employee. + References No definition available. + Details
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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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