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Stock-based Compensation - Stock Option Activities (Detail)
$ / shares in Units, $ in Thousands
 3 Months Ended
Apr. 30, 2018
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Shares, Outstanding | shares 1,611,344
Shares, Granted | shares 21,900
Shares, Exercised | shares (42,483)
Shares, Forfeited | shares (8,921)
Shares, Expired | shares (561)
Shares, Outstanding | shares 1,581,279
Shares, Exercisable | shares 1,354,895
Weighted-Average Exercise Price, Outstanding $ 24.56
Weighted-Average Exercise Price, Granted 49.91
Weighted-Average Exercise Price, Exercised 7.17
Weighted-Average Exercise Price, Forfeited 55.40
Weighted-Average Exercise Price, Expired 71.16
Weighted-Average Exercise Price, Outstanding 25.19
Weighted-Average Exercise Price, Exercisable 20.32
Weighted-Average Grant-date Fair Value, Granted $ 25.48
Total Intrinsic Value Of Options Exercised | $ $ 1,853
Weighted-Average Remaining Contractual Term, Outstanding 4 years 6 months 3 days
Weighted-Average Remaining Contractual Term, Exercisable 3 years 10 months 6 days
Aggregate Intrinsic Value, Outstanding | $ $ 39,119
Aggregate Intrinsic Value, Exercisable | $ $ 38,705