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Stock Compensation Plans (Details) (USD $)
12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 70,164,000    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value $ 29.11 $ 21.78 $ 22.46
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 39,542,000 14,359,000 65,268,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 8 months    
Allocated Share-based Compensation Expense 32,188,000 26,938,000 30,447,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense 11,434,000 9,541,000 11,073,000
Performance Based Restricted Stock units (PSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value 10,192,000 20,340,000 193,000
Employee Incentive Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 13,500,000    
Reduction In Authorized Shares For Every Share Delivered To Stock Based Compensation Award 1.58    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date 10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 25.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years    
Restricted Stock Units (RSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 26,497,000 $ 21,752,000 $ 21,333,000
Directors Option Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized 1,000,000    
Reduction In Authorized Shares For Every Share Delivered To Stock Based Compensation Award 1.58    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Date 10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Per Employee 25,000    
Executive Officer [Member] | Performance Based Restricted Stock units (PSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Executive Officer [Member] | Restricted Stock Units (RSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Other Management Employees [Member] | Restricted Stock Units (RSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 25.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 4 years    
Director [Member] | Restricted Stock Units (RSUs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 1 year