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Stock-Based Compensation - Stock Option Activities (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
6 Months Ended
Jul. 31, 2013
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Shares, Outstanding 4,344,535
Shares, Granted 138,720
Shares, Exercised (424,168)
Shares, Forfeited (51,165)
Shares, Outstanding 4,007,922
Shares, Exercisable 2,973,868
Shares, Vested and expected to vest 3,945,728
Weighted-Average Exercise Price, Outstanding $ 6.07
Weighted-Average Exercise Price, Granted $ 15.22
Weighted-Average Exercise Price, Exercised $ 4.24
Weighted-Average Exercise Price, Forfeited $ 10.28
Weighted-Average Exercise Price, Outstanding $ 6.52
Weighted-Average Exercise Price, Exercisable $ 5.60
Weighted-Average Exercise Price, Vested and expected to vest $ 6.48
Weighted-Average Grant-date Fair Value, Granted $ 9.05
Total Intrinsic Value of options Exercised, Exercised $ 4,781
Weighted-Average Remaining Contractual Term, Outstanding 6 years 7 months 2 days
Weighted-Average Remaining Contractual Term, Exercisable 6 years 4 days
Weighted-Average Remaining Contractual Term, Vested and expected to vest 6 years 6 months 22 days
Aggregate Intrinsic Value, Outstanding 40,382
Aggregate Intrinsic Value, Exercisable 32,717
Aggregate Intrinsic Value, Vested and expected to vest $ 39,927