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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands |  |  |  |  | 3 Months Ended | 6 Months Ended |  |
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Jan. 25, 2018 $ / shares shares | Jan. 02, 2018 director $ / shares shares | Dec. 18, 2017 $ / shares shares | Feb. 02, 2017 shares | Apr. 30, 2018 USD ($) | Jan. 31, 2018 USD ($) | Apr. 30, 2017 USD ($) | Apr. 30, 2018 USD ($) $ / shares shares | Apr. 30, 2017 USD ($) | Oct. 31, 2017 USD ($) | Apr. 30, 2011 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock compensation expense |  |  |  |  |  |  |  | $ 2,774 | $ 2,658 |  |
Non-employee directors [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Market price of common stock at grant date | $ / shares | $ 87.10 |  |  |  |  |  |  |  |  |  |
Stock compensation expense |  |  |  |  |  | $ 800 |  |  |  |  |
Granted | shares | 10,788 |  |  |  |  |  |  |  |  |  |
Vice President [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock compensation expense |  |  |  |  |  |  |  | $ 100 |  |  |
Granted | shares |  |  |  | 867 |  |  |  |  |  |  |
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 |  |  |
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 |  |  |  |  |  |  |  | $ 17.66 |  |  |
2011 Management Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock shares authorized under ESPP | shares |  |  |  |  |  |  |  |  |  |  | 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 | shares |  | 1,750 |  |  |  |  |  |  |  |  |
Restricted stock closing price awarded | $ / shares |  |  |  |  |  |  |  | $ 80.20 |  |  |
Restricted shares granted | shares |  | 21,000 |  |  |  |  |  | 47,000 |  |  |
Recognized stock-based compensation expense |  |  |  |  | $ 900 |  | $ 800 | $ 1,800 | $ 1,500 |  |
Unrecognized stock based compensation expenses |  |  |  |  | 4,800 |  |  | 4,800 |  | $ 3,000 |
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 |  | $ 85.90 |  |  |  |  |  |  |  |  |
Recognized stock-based compensation expense |  |  |  |  | 500 |  |  | 600 |  |  |
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 | shares |  |  | 25,241 |  |  |  |  |  |  |  |
Stock price | $ / shares |  |  | $ 75.45 |  |  |  |  |  |  |  |
Recognized stock-based compensation expense |  |  |  |  | $ 200 |  |  | $ 300 |  |  |
Shares vesting schedule per year |  |  | .33 |  |  |  |  |  |  |  |

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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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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