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Summary of Stock Option Activity (Detail) - Stock Options - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards outstanding at beginning of year, Shares 670,000  
Exercised, Shares (25,000)  
Forfeited or Expired, Shares (130,000)  
Awards outstanding at end of year, Shares 515,000 670,000
Awards outstanding fully vested and expected to vest, Shares 515,000  
Awards exercisable at end of year, Shares 515,000  
Awards outstanding at beginning of year, Weighted Average Exercise Price $ 32.94  
Exercised, Weighted Average Exercise Price 19.80  
Forfeited or Expired, Weighted Average Exercise Price 41.38  
Awards outstanding at end of year, Weighted Average Exercise Price 31.45 $ 32.94
Awards outstanding fully vested and expected to vest, Weighted Average Exercise Price 31.45  
Awards exercisable at end of year, Weighted Average Exercise Price $ 31.45  
Awards outstanding at end of year, Weighted Average Remaining Contractual Term (years) 3 years 3 years 10 months 24 days
Awards outstanding fully vested and expected to vest, Weighted Average Remaining Contractual Term (years) 3 years  
Awards exercisable at end of year, Weighted Average Remaining Contractual Term (years) 3 years  
Awards outstanding, Aggregate Intrinsic Value $ 1,249 $ 964
Awards outstanding fully vested and expected to vest, Aggregate Intrinsic Value 1,249  
Awards exercisable at end of year, Aggregate Intrinsic Value $ 1,249