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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, 2016
Jan. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards outstanding at beginning of year, Shares 893,408  
Granted, Shares 0  
Exercised, Shares (520,358)  
Forfeited or Expired, Shares (68,950)  
Awards outstanding at end of year, Shares 304,100 893,408
Awards outstanding expected to vest, Shares 302,687  
Awards outstanding at end of year, Shares 224,180  
Awards outstanding at beginning of year, Weighted Average Exercise Price $ 30.89  
Granted, Weighted Average Exercise Price 0  
Exercised, Weighted Average Exercise Price 29.68  
Forfeited or Expired, Weighted Average Exercise Price (36.25)  
Awards outstanding at end of year, Weighted Average Exercise Price 31.74 $ 30.89
Awards outstanding expected to vest, Weighted Average Exercise Price 31.74  
Awards exercisable at end of year, Weighted Average Exercise Price $ 31.25  
Awards outstanding at end of year, Weighted Average Remaining Contractual Term (years) 3 years 6 months 4 years 7 months 6 days
Awards outstanding expected to vest, Weighted Average Remaining Contractual Term (years) 3 years 6 months  
Awards exercisable at end of year, Weighted Average Remaining Contractual Term (years) 3 years 6 months  
Awards outstanding at beginning of year, Aggregate Intrinsic Value $ 3,990  
Awards outstanding at end of year, Aggregate Intrinsic Value   $ 3,990
Awards outstanding expected to vest, Aggregate Intrinsic Value 0  
Awards exercisable at end of year, Aggregate Intrinsic Value $ 0