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Stockholders' Equity - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended |  |
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Oct. 31, 2014 | Oct. 31, 2013 | Oct. 31, 2014 | Oct. 31, 2013 | Oct. 31, 2014 Stock Options [Member] | Oct. 31, 2013 Stock Options [Member] | Oct. 31, 2014 Stock Options [Member] | Oct. 31, 2013 Stock Options [Member] | Oct. 31, 2014 Restricted Stock, Restricted Stock Units and Performance Stock Units [Member] | Oct. 31, 2013 Restricted Stock, Restricted Stock Units and Performance Stock Units [Member] | Oct. 31, 2014 Restricted Stock, Restricted Stock Units and Performance Stock Units [Member] | Oct. 31, 2013 Restricted Stock, Restricted Stock Units and Performance Stock Units [Member] | Oct. 31, 2014 Restricted Stock and Restricted Stock Unit [Member] | Oct. 31, 2014 Performance Stock Units [Member] | Oct. 31, 2014 Employee Stock Purchase Plan [Member] | Oct. 31, 2013 Employee Stock Purchase Plan [Member] | Oct. 31, 2014 Employee Stock Purchase Plan [Member] | Oct. 31, 2013 Employee Stock Purchase Plan [Member] | Oct. 31, 2014 Non-Employee Director [Member] Restricted Stock Awards [Member] | Oct. 31, 2014 Employee [Member] Restricted Stock Awards [Member] | Oct. 31, 2014 2006 Stock Incentive Plan [Member] Minimum [Member] | Oct. 31, 2014 2006 Stock Incentive Plan [Member] Maximum [Member] | Oct. 31, 2014 Class A Common Stock [Member] 2006 Stock Incentive Plan [Member] | Apr. 30, 2007 Class A Common Stock [Member] 2006 Stock Incentive Plan [Member]
Limited Partners' Capital Account [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock, issued shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,475,000
Number of shares available for future grant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 994,000 |
Options vesting period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 years | 3 years | 1 year | 4 years |  |
Options granted period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years |  |
Stock-based compensation expense |  |  |  |  | $ 165 | $ 88 | $ 275 | $ 203 | $ 465 | $ 475 | $ 897 | $ 966 |  |  | $ 16 | $ 15 | $ 37 | $ 39 |  |  |  |  |  |
Unrecognized stock-based compensation expense |  |  |  |  | $ 1,200 |  | $ 1,200 |  |  |  |  |  | $ 2,685 | $ 2,479 |  |  |  |  |  |  |  |  |  |
Unrecognized stock-based compensation expense, weighted average period |  |  |  |  |  |  | 1 year 9 months 18 days |  |  |  |  |  | 1 year 10 months 24 days | 6 months |  |  |  |  |  |  |  |  |  |
Expected dividend yield | 0.00% |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Options, Granted |  | 0 | 200,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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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 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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