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Stock-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
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Jan. 06, 2017 USD ($) $ / shares shares | Dec. 19, 2016 $ / shares shares | Jan. 04, 2016 director $ / shares shares | Jan. 31, 2017 USD ($) $ / shares shares | Jul. 31, 2017 USD ($) | Jul. 31, 2016 USD ($) | Jul. 31, 2017 USD ($) $ / shares shares | Jul. 31, 2016 USD ($) | Oct. 31, 2016 USD ($) | Apr. 30, 2011 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock compensation expense | $ |  |  |  |  |  |  | $ 3,489 | $ 1,577 |  |
Chief Operating Officer [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Market price of common stock at grant date | $ / shares | $ 58.05 |  |  |  |  |  |  |  |  |
Stock compensation expense | $ | $ 700 |  |  |  |  |  |  |  |  |
Unvested portion of restricted stock forfeited | 12,800 |  |  |  |  |  |  |  |  |
Granted | 12,800 |  |  |  |  |  |  |  |  |
Vice President [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock compensation expense | $ |  |  |  |  |  |  | $ 500 |  |  |
Vested, Number of Shares |  |  |  | 13,040 |  |  |  |  |  |
Board of Director Members for January Two Thousand Seventeen Option Grants [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Term of vested stock options |  |  |  | 5 years |  |  |  |  |  |
Market price of common stock at grant date | $ / shares |  |  |  | $ 56.65 |  |  |  |  |  |
Vesting period |  |  |  | 5 years |  |  |  |  |  |
Estimated fair market value of options | $ |  |  |  | $ 200 |  |  |  |  |  |
Stock options total compensation cost, not yet recognized | $ |  |  |  | $ 200 |  |  |  |  |  |
Remaining service period for recognition of unrecognized compensation cost |  |  |  |  |  |  | 60 months |  |  |
Granted |  |  |  | 10,000 |  |  |  |  |  |
Exercised, Weighted-Average Exercise Price | $ / shares |  |  |  | $ 56.65 |  |  |  |  |  |
Stock Options [Member] | Minimum |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  | 5 years |  |  |
Expiration period, after grant date |  |  |  |  |  |  | 5 years |  |  |
2005 Stock Incentive Plan [Member] | Stock Options [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Exercised, Weighted-Average Exercise Price | $ / shares |  |  |  |  |  |  | $ 14.58 |  |  |
2011 Management Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock shares authorized under ESPP |  |  |  |  |  |  |  |  |  | 1,500,000
Number of non-employee directors | director |  |  | 12 |  |  |  |  |  |  |
2011 Management Incentive Plan [Member] | Restricted Stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted shares granted per non-employee |  |  | 1,750 |  |  |  |  |  |  |
Restricted stock closing price awarded | $ / shares |  |  |  |  |  |  | $ 57.62 |  |  |
Restricted shares granted |  |  | 21,000 |  |  |  | 103,000 |  |  |
Recognized stock-based compensation expense | $ |  |  |  |  | $ 800 | $ 600 | $ 3,500 | $ 1,600 |  |
Unrecognized stock based compensation expenses | $ |  |  |  |  | 3,900 |  | $ 3,900 |  | $ 7,400 |
Vested, Number of Shares |  |  |  |  |  |  | 69,000 |  |  |
2011 Management Incentive Plan [Member] | Restricted Stock [Member] | Non-Employee Directors [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Stock price | $ / shares |  |  | $ 62.65 |  |  |  |  |  |  |
Recognized stock-based compensation expense | $ |  |  |  |  | 300 |  | $ 800 |  |  |
2011 Management Incentive Plan [Member] | Restricted Stock [Member] | Executive Officers [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Restricted shares granted |  | 70,327 |  |  |  |  |  |  |  |
Stock price | $ / shares |  | $ 56.20 |  |  |  |  |  |  |  |
Recognized stock-based compensation expense | $ |  |  |  |  | $ 300 |  | $ 600 |  |  |
Shares vesting schedule per year |  | .33 |  |  |  |  |  |  |  |
2011 Management Incentive Plan [Member] | Stock Options [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Granted |  |  |  |  |  |  | 10,000 |  |  |
Exercised, Weighted-Average Exercise Price | $ / shares |  |  |  |  |  |  | $ 21.80 |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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