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Summary of Stock Option Activity (Detail) (Stock Options, USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Jan. 31, 2014
Stock Options
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards outstanding at beginning of year, Shares 4,316,740
Granted, Shares 100,000
Exercised, Shares (1,583,296)
Forfeited or Expired, Shares (20,250)
Awards outstanding at end of year, Shares 2,813,194
Awards outstanding expected to vest, Shares 2,803,242
Awards exercisable at end of year, Shares 2,614,160
Awards outstanding at beginning of year, Weighted Average Exercise Price $ 27.82
Granted, Weighted Average Exercise Price $ 46.02
Exercised, Weighted Average Exercise Price $ 22.24
Forfeited or Expired, Weighted Average Exercise Price $ 36.14
Awards outstanding at end of year, Weighted Average Exercise Price $ 31.55
Awards outstanding expected to vest, Weighted Average Exercise Price $ 31.55
Awards exercisable at end of year, Weighted Average Exercise Price $ 31.00
Awards outstanding at end of year, Weighted Average Remaining Contractual Term (years) 2 years 3 months 18 days
Awards outstanding expected to vest, Weighted Average Remaining Contractual Term (years) 2 years 3 months 18 days
Awards exercisable at end of year, Weighted Average Remaining Contractual Term (years) 2 years 3 months 18 days
Awards outstanding at end of year, Aggregate Intrinsic Value $ 14,502
Awards outstanding expected to vest, Aggregate Intrinsic Value 13,777
Awards exercisable at end of year, Aggregate Intrinsic Value $ 13,923