v2.4.0.8
Stock Option Activity (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Number of Options    
Beginning balance 10,829 12,083
Options granted 2,092 5,053
Options exercised (3,360) (4,597)
Options forfeited (2,470) (1,710)
Ending balance 7,091 10,829
Options vested and expected to vest at April 30, 2014 6,901  
Options vested and exercisable as of April 30, 2014 3,658  
Weighted Average Exercise Price    
Beginning balance $ 6.83 $ 4.57
Options granted $ 8.32 $ 8.43
Options exercised $ 3.34 $ 2.45
Options forfeited $ 10.22 $ 7.49
Ending balance $ 7.74 $ 6.83
Options vested and expected to vest at April 30, 2014 $ 7.70  
Options vested and exercisable as of April 30, 2014 $ 6.71  
Weighted Average Remaining Contractual Term (in Years)    
Balance as of April 30, 2014 7 years 7 days  
Options vested and expected to vest at April 30, 2014 6 years 11 months 23 days  
Options vested and exercisable as of April 30, 2014 5 years 4 months 24 days  
Aggregate Intrinsic Value    
Balance as of April 30, 2014 $ 6,264  
Options vested and expected to vest at April 30, 2014 6,253  
Options vested and exercisable as of April 30, 2014 $ 5,982