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Summary of Stock Appreciation Right Activity (Detail) - Stock Appreciation Rights (SARs) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards outstanding at beginning of year, Shares 231,325    
Granted, Shares 0 0 0
Exercised, Shares (3,175)    
Forfeited or Expired, Shares (13,175)    
Awards outstanding at end of year, Shares 214,975 231,325  
Awards outstanding fully vested and expected to vest, Shares 214,975    
Awards outstanding at end of year, Shares 203,849    
Awards outstanding at beginning of year, Weighted Average Exercise Price $ 32.69    
Granted, Weighted Average Exercise Price 0    
Exercised, Weighted Average Exercise Price 32.80    
Forfeited or Expired, Weighted Average Exercise Price 32.80    
Awards outstanding at end of year, Weighted Average Exercise Price 32.69 $ 32.69  
Awards outstanding fully vested and expected to vest, Weighted Average Exercise Price 32.69    
Awards exercisable at end of year, Weighted Average Exercise Price $ 32.45    
Awards outstanding at end of year, Weighted Average Remaining Contractual Term (years) 1 year 7 months 6 days 2 years 6 months  
Awards outstanding fully vested and expected to vest, Weighted Average Remaining Contractual Term (years) 1 year 7 months 6 days    
Awards exercisable at end of year, Weighted Average Remaining Contractual Term (years) 1 year 6 months    
Awards outstanding, Aggregate Intrinsic Value $ 493 $ 0  
Awards outstanding fully vested and expected to vest, Aggregate Intrinsic Value 493    
Awards exercisable at end of year, Aggregate Intrinsic Value $ 493