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Summary of Stock Appreciation Right Activity (Detail) (Stock Appreciation Rights (SARs), USD $)
 12 Months Ended
Jan. 31, 2013
Stock Appreciation Rights (SARs)
  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Awards outstanding at beginning of year, Shares 6,030,650
Granted, Shares 100,000
Exercised, Shares (1,382,760)
Forfeited or Expired, Shares (431,150)
Awards outstanding at end of year, Shares 4,316,740
Awards outstanding expected to vest, Shares 4,302,980
Awards exercisable at end of year, Shares 3,870,715
Awards outstanding at beginning of year, Weighted Average Exercise Price $ 26.86
Granted, Weighted Average Exercise Price $ 29.92
Exercised, Weighted Average Exercise Price $ 22.18
Forfeited or Expired, Weighted Average Exercise Price $ 33.09
Awards outstanding at end of year, Weighted Average Exercise Price $ 27.82
Awards outstanding expected to vest, Weighted Average Exercise Price $ 27.82
Awards exercisable at end of year, Weighted Average Exercise Price $ 27.27
Awards outstanding at end of year, Weighted Average Remaining Contractual Term (years) 2 years 8 months 12 days
Awards outstanding expected to vest, Weighted Average Remaining Contractual Term (years) 2 years 8 months 12 days
Awards exercisable at end of year, Weighted Average Remaining Contractual Term (years) 2 years 7 months 6 days
Awards outstanding at end of year, Aggregate Intrinsic Value $ 64,658
Awards outstanding expected to vest, Aggregate Intrinsic Value 62,663
Awards exercisable at end of year, Aggregate Intrinsic Value $ 60,098