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Stock-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 08, 2016 $ / shares shares | Jan. 04, 2016 director $ / shares shares | Jul. 31, 2016 USD ($) | Jul. 31, 2016 USD ($) shares | Apr. 30, 2011 shares
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 |
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 shares granted |  | 21,000 |  | 51,000 |
Recognized stock-based compensation expense | $ |  |  | $ 0.6 | $ 1.6 |
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 |  | $ 48.46 |  |  |
Recognized stock-based compensation expense | $ |  |  | 0.3 | 0.6 |
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 | 24,582 |  |  |  |
Stock price | $ / shares | $ 48.68 |  |  |  |
Recognized stock-based compensation expense | $ |  |  | $ 0.1 | $ 0.2 |
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=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 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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