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Stock-Based Compensation - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 9 Months Ended | 0 Months Ended | 9 Months Ended |  | 0 Months Ended | 3 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended
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Jul. 31, 2014 | Jul. 31, 2013 | Jan. 27, 2014 2011 Management Incentive Plan [Member] | Jan. 09, 2014 2011 Management Incentive Plan [Member] | Jul. 31, 2014 2011 Management Incentive Plan [Member] | Apr. 30, 2011 2011 Management Incentive Plan [Member] | Jan. 09, 2014 2011 Management Incentive Plan [Member] Employee Stock [Member] Shares_per_employee | Jan. 09, 2014 2011 Management Incentive Plan [Member] Restricted Stock [Member] | Jul. 31, 2014 2011 Management Incentive Plan [Member] Stock Options [Member] | Jul. 31, 2014 2011 Management Incentive Plan [Member] Stock Options [Member] | Jan. 09, 2014 2011 Management Incentive Plan [Member] Director [Member] Directors | Jan. 27, 2014 2011 Management Incentive Plan [Member] Executive Officer [Member] Restricted Stock [Member] | Jul. 31, 2014 2011 Management Incentive Plan [Member] Board of Director Members for October Two Thousand Eleven Option Grants [Member] Maximum [Member] | Jul. 31, 2014 2011 Management Incentive Plan [Member] Board of Director Members for October Two Thousand Eleven Option Grants [Member] Maximum [Member] Stock Options [Member] | Jul. 31, 2014 2011 Management Incentive Plan [Member] Board of Director Members for April Two Thousand Eleven Option Grants [Member] Minimum [Member] | Jul. 31, 2014 2011 Management Incentive Plan [Member] Board of Director Members for April Two Thousand Eleven Option Grants [Member] Minimum [Member] Stock Options [Member] | Jul. 31, 2014 2005 Stock 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 |  |  |  |  |  |  |  |  |  |  | 12 |  |  |  |  |  |
Restricted shares issued per non-employee directors |  |  |  |  |  |  | 1,750 |  |  |  |  |  |  |  |  |  |
Total restricted shares issued to non-employee directors |  |  |  |  |  |  |  | 21,000 |  |  |  |  |  |  |  |  |
Restricted stock closing price awarded to executive officers |  |  | $ 30.50 | $ 32.49 |  |  |  |  |  |  |  |  |  |  |  |  |
Total restricted shares issued to executive officers |  |  |  |  |  |  |  |  |  |  |  | 10,774 |  |  |  |  |
Stock options vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  | 1 year |
Term of vested stock options |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  | 2 years |  |
Weighted-average remaining life of stock options |  |  |  |  | 5 years 10 months 24 days |  |  |  |  |  |  |  |  |  |  |  | 3 years 9 months 18 days
Exercisable stock options, weighted-average remaining contractual term |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |  |  | 3 years 3 months 18 days
Stock-based compensation expense | $ 517 | $ 288 |  |  |  |  |  |  | $ 200 | $ 500 |  |  |  |  |  |  |

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- Definition Share based compensation arrangements by share based payment award term of vested options. + References No definition available. + Details
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- Definition Share Based Nonemployee Per Director Services Transaction Quantity Of Restricted Shares Issued + References No definition available. + 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=31042434&loc=d3e3602-108585 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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://www.xbrl.org/2003/role/presentationRef -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=6415400&loc=d3e5070-113901 + 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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- Definition Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares or units of entity securities issued in the transaction in which equity securities were issued to pay for goods or nonemployee services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6406099&loc=d3e25284-112666 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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