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
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Oct. 31, 2013
|
Oct. 31, 2014
|
Oct. 31, 2013
|
Oct. 31, 2014
Stock Options [Member]
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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 |