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Stockholders' Equity - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2014 | Jan. 31, 2013 | Apr. 30, 2007
Stock Options [Member] |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Expiration period of options granted |  |  |  |  | 10 years
Stock-based compensation expense | $ 155 | $ 123 | $ 359 | $ 285 |
Unrecognized stock-based compensation expense | 961 |  | 961 |  |
Unrecognized stock-based compensation expense, weighted average period |  |  | 1 year 9 months 18 days |  |
Performance Stock Units [Member] |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Awarded certain employees |  |  | 0 |  |
Unrecognized stock-based compensation expense | 0 |  | 0 |  |
Restricted Stock, Restricted Stock Units and Performance Stock Units [Member] |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Stock-based compensation expense | 465 | 109 | 1,431 | 1,201 |
Restricted Stock and Restricted Stock Unit [Member] |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Unrecognized stock-based compensation expense, weighted average period |  |  | 1 year 10 months 24 days |  |
Unrecognized stock-based compensation expense | 2,402 |  | 2,402 |  |
Performance Stock Units [Member] |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Unrecognized stock-based compensation expense, weighted average period |  |  | 10 months 24 days |  |
Unrecognized stock-based compensation expense | 4,082 |  | 4,082 |  |
Employee Stock Purchase Plan [Member] |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Stock-based compensation expense | $ 21 | $ 22 | $ 61 | $ 75 |
Restricted Stock Awards [Member] |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Vesting period from date of grant |  |  | 3 years |  |
Minimum [Member] | Stock Options [Member] |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Vesting period from date of grant |  |  | 1 year |  |
Maximum [Member] | Stock Options [Member] |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Vesting period from date of grant |  |  | 4 years |  |
Maximum [Member] | Restricted Stock Units [Member] |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Vesting period from date of grant |  |  | 3 years |  |
Class A Common Stock [Member] | 2006 Stock Incentive Plan [Member] |  |  |  |  |
Limited Partners' Capital Account [Line Items] |  |  |  |  |
Common stock, issued shares |  |  |  |  | 2,475
Number of shares available for future grant | 1,072 |  | 1,072 |  |

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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 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 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 Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, 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 (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References No definition available. + 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 number of grants made 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 Period from grant date that an equity-based award expires, 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)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + 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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