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Summary of Stock Appreciation Right Activity (Detail) (Stock Appreciation Rights(SARs), USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended
Jan. 31, 2014
Stock Appreciation Rights(SARs)
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards outstanding at beginning of year, Shares 1,198,800
Granted, Shares 27,500
Exercised, Shares (63,400)
Forfeited or Expired, Shares (60,425)
Awards outstanding at end of year, Shares 1,102,475
Awards outstanding expected to vest, Shares 1,064,159
Awards outstanding at end of year, Shares 336,150
Awards outstanding at beginning of year, Weighted Average Exercise Price $ 31.15
Granted, Weighted Average Exercise Price $ 39.06
Exercised, Weighted Average Exercise Price $ 28.11
Forfeited or Expired, Weighted Average Exercise Price $ 34.64
Awards outstanding at end of year, Weighted Average Exercise Price $ 31.33
Awards outstanding expected to vest, Weighted Average Exercise Price $ 31.33
Awards exercisable at end of year, Weighted Average Exercise Price $ 30.72
Awards outstanding at end of year, Weighted Average Remaining Contractual Term (years) 5 years 8 months 12 days
Awards outstanding expected to vest, Weighted Average Remaining Contractual Term (years) 5 years 8 months 12 days
Awards exercisable at end of year, Weighted Average Remaining Contractual Term (years) 5 years 8 months 12 days
Awards outstanding at end of year, Aggregate Intrinsic Value $ 5,330
Awards outstanding expected to vest, Aggregate Intrinsic Value 5,063
Awards exercisable at end of year, Aggregate Intrinsic Value $ 1,722