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Summary of Stock Option Activity (Detail) (Stock Options, USD $)
 12 Months Ended
Jan. 31, 2013
Stock Options
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards outstanding at beginning of year, Shares 650,800
Granted, Shares 595,000
Exercised, Shares   
Forfeited or Expired, Shares (47,000)
Awards outstanding at end of year, Shares 1,198,800
Awards outstanding expected to vest, Shares 1,141,360
Awards outstanding at end of year, Shares 50,000
Awards outstanding at beginning of year, Weighted Average Exercise Price $ 30.91
Granted, Weighted Average Exercise Price $ 31.47
Exercised, Weighted Average Exercise Price   
Forfeited or Expired, Weighted Average Exercise Price $ 32.25
Awards outstanding at end of year, Weighted Average Exercise Price $ 31.15
Awards outstanding expected to vest, Weighted Average Exercise Price $ 31.15
Awards exercisable at end of year, Weighted Average Exercise Price $ 26.85
Awards outstanding at end of year, Weighted Average Remaining Contractual Term (years) 6 years 8 months 12 days
Awards outstanding expected to vest, Weighted Average Remaining Contractual Term (years) 6 years 8 months 12 days
Awards exercisable at end of year, Weighted Average Remaining Contractual Term (years) 6 years 9 months 18 days
Awards outstanding at end of year, Aggregate Intrinsic Value $ 13,966,000
Awards outstanding expected to vest, Aggregate Intrinsic Value 13,268,000
Awards exercisable at end of year, Aggregate Intrinsic Value $ 798,000