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Summary of Stock Option Activity (Detail) - Stock Options - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards outstanding at beginning of year, Shares 900,000  
Granted, Shares 140,000  
Exercised, Shares (430,000)  
Awards outstanding at end of year, Shares 610,000 900,000
Awards outstanding fully vested and expected to vest, Shares 610,000  
Awards exercisable at end of year, Shares 470,000  
Awards outstanding at beginning of year, Weighted Average Exercise Price $ 32.01  
Granted, Weighted Average Exercise Price 46.42  
Exercised, Weighted Average Exercise Price 31.67  
Awards outstanding at end of year, Weighted Average Exercise Price 35.55 $ 32.01
Awards outstanding fully vested and expected to vest, Weighted Average Exercise Price 35.55  
Awards exercisable at end of year, Weighted Average Exercise Price $ 32.31  
Awards outstanding at end of year, Weighted Average Remaining Contractual Term (years) 3 years 10 months 24 days 3 years 4 months 24 days
Awards outstanding fully vested and expected to vest, Weighted Average Remaining Contractual Term (years) 3 years 10 months 24 days  
Awards exercisable at end of year, Weighted Average Remaining Contractual Term (years) 3 years 2 months 12 days  
Awards outstanding, Aggregate Intrinsic Value $ 2,007 $ 3,933
Awards outstanding fully vested and expected to vest, Aggregate Intrinsic Value 2,007  
Awards exercisable at end of year, Aggregate Intrinsic Value $ 2,007