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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 02, 2019 director $ / shares shares | Dec. 14, 2018 $ / shares shares | Jul. 31, 2019 USD ($) | Jul. 31, 2018 USD ($) | Jul. 31, 2019 USD ($) $ / shares shares | Jul. 31, 2018 USD ($) | Apr. 30, 2011 shares
Restricted Stock [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted shares granted |  |  |  |  | 35,000 |  |
Restricted stock closing price awarded (in dollars per share) | $ / shares |  |  |  |  | $ 77.33 |  |
Recognized stock-based compensation expense | $ |  |  | $ 0.9 | $ 0.9 | $ 2.7 | $ 2.7 |
Unrecognized stock based compensation expenses | $ |  |  | 2.9 |  | $ 2.9 |  |
Vested, Number of Shares |  |  |  |  | (51,000) |  |
Restricted Stock [Member] | Non-employee directors [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of non-employee directors | director | 12 |  |  |  |  |  |
Restricted shares granted per non-employee | 1,750 |  |  |  |  |  |
Restricted shares granted | 21,000 |  |  |  |  |  |
Restricted stock closing price awarded (in dollars per share) | $ / shares | $ 71.56 |  |  |  |  |  |
Recognized stock-based compensation expense | $ |  |  | 0.4 |  | $ 0.9 |  |
Restricted Stock [Member] | Executive officers [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Restricted shares granted |  | 14,522 |  |  |  |  |
Restricted stock closing price awarded (in dollars per share) | $ / shares |  | $ 85.67 |  |  |  |  |
Recognized stock-based compensation expense | $ |  |  | $ 0.1 |  | $ 0.3 |  |
Annual incremental vesting percentage |  | 33.00% |  |  |  |  |
Stock Options [Member] | Minimum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  |  |  | 1 year |  |
Expiration period, after grant date |  |  |  |  | 2 years |  |
Stock Options [Member] | Maximum [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Vesting period |  |  |  |  | 5 years |  |
Expiration period, after grant date |  |  |  |  | 5 years |  |
2011 Management Incentive Plan [Member] |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Common stock shares authorized under plan |  |  |  |  |  |  | 1,500,000

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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=116856206&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=116856206&loc=d3e5070-113901 + Details
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