XML 78 R58.htm IDEA: XBRL DOCUMENT v3.3.1.900
Summary of Stock Option Activity (Detail) - Stock Options - 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 2,464,390  
Granted, Shares 120,000  
Exercised, Shares (1,416,990)  
Forfeited or Expired, Shares (217,025)  
Awards outstanding at end of year, Shares 950,375 2,464,390
Awards outstanding expected to vest, Shares 944,375  
Awards exercisable at end of year, Shares 830,375  
Awards outstanding at beginning of year, Weighted Average Exercise Price $ 32.69  
Granted, Weighted Average Exercise Price 38.09  
Exercised, Weighted Average Exercise Price 32.75  
Forfeited or Expired, Weighted Average Exercise Price 33.24  
Awards outstanding at end of year, Weighted Average Exercise Price 33.17 $ 32.69
Awards outstanding expected to vest, Weighted Average Exercise Price 33.17  
Awards exercisable at end of year, Weighted Average Exercise Price $ 32.46  
Awards outstanding at end of year, Weighted Average Remaining Contractual Term (years) 2 years 10 months 24 days 1 year 7 months 6 days
Awards outstanding expected to vest, Weighted Average Remaining Contractual Term (years) 2 years 10 months 24 days  
Awards exercisable at end of year, Weighted Average Remaining Contractual Term (years) 2 years 10 months 24 days  
Awards outstanding at beginning of year, Aggregate Intrinsic Value $ 8,547  
Awards outstanding at end of year, Aggregate Intrinsic Value 307 $ 8,547
Awards outstanding expected to vest, Aggregate Intrinsic Value 292  
Awards exercisable at end of year, Aggregate Intrinsic Value $ 307