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Summary of Stock Option Activity (Detail) - Stock Options - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards outstanding at beginning of year, Shares 950,375  
Granted, Shares 140,000  
Exercised, Shares (177,625)  
Forfeited or Expired, Shares (4,500)  
Awards outstanding at end of year, Shares 908,250 950,375
Awards outstanding expected to vest, Shares 901,250  
Awards exercisable at end of year, Shares 768,250  
Awards outstanding at beginning of year, Weighted Average Exercise Price $ 33.17  
Granted, Weighted Average Exercise Price 28.47  
Exercised, Weighted Average Exercise Price 23.06  
Forfeited or Expired, Weighted Average Exercise Price 27.27  
Awards outstanding at end of year, Weighted Average Exercise Price 34.45 $ 33.17
Awards outstanding expected to vest, Weighted Average Exercise Price 34.45  
Awards exercisable at end of year, Weighted Average Exercise Price $ 35.54  
Awards outstanding at end of year, Weighted Average Remaining Contractual Term (years) 3 years 1 month 6 days 2 years 10 months 24 days
Awards outstanding expected to vest, Weighted Average Remaining Contractual Term (years) 3 years 1 month 6 days  
Awards exercisable at end of year, Weighted Average Remaining Contractual Term (years) 3 years 1 month 6 days  
Awards outstanding at beginning of year, Aggregate Intrinsic Value $ 307  
Awards outstanding at end of year, Aggregate Intrinsic Value 75 $ 307
Awards outstanding expected to vest, Aggregate Intrinsic Value 71  
Awards exercisable at end of year, Aggregate Intrinsic Value $ 75