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Summary of Stock Option Activity (Detail) - Stock Options - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards outstanding at beginning of year, Shares 610,000  
Granted, Shares 160,000  
Exercised, Shares (40,000)  
Forfeited or Expired, Shares (60,000)  
Awards outstanding at end of year, Shares 670,000 610,000
Awards outstanding fully vested and expected to vest, Shares 670,000  
Awards exercisable at end of year, Shares 510,000  
Awards outstanding at beginning of year, Weighted Average Exercise Price $ 35.55  
Granted, Weighted Average Exercise Price 23.74  
Exercised, Weighted Average Exercise Price 24.37  
Forfeited or Expired, Weighted Average Exercise Price 40.65  
Awards outstanding at end of year, Weighted Average Exercise Price 32.94 $ 35.55
Awards outstanding fully vested and expected to vest, Weighted Average Exercise Price 32.94  
Awards exercisable at end of year, Weighted Average Exercise Price $ 35.83  
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 $ 964 $ 2,007
Awards outstanding fully vested and expected to vest, Aggregate Intrinsic Value 964  
Awards exercisable at end of year, Aggregate Intrinsic Value $ 666