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Stock Compensation Plans - (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
12 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum value per non-employee director in stock option or award, per year $ 750    
Weighted average grant date fair value (in usd per share) $ 16.57 $ 16.97 $ 18.33
Exercises in period, intrinsic value $ 52,800 $ 16,300 $ 31,200
Compensation cost not yet recognized $ 94,700    
Compensation cost not yet recognized, period for recognition (years) 3 years    
Share-based compensation expense $ 33,200 34,100 28,000
Tax benefit from compensation expense $ 6,500 $ 6,800 $ 8,500
Director Option Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized 1.0    
Stock award period (years) 10 years    
Performance Based Restricted Stock units (PSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (years) 3 years    
Granted (in usd per share) $ 134.12 $ 85.26 $ 108.99
Vested in period, fair value $ 9,800 $ 2,700 $ 3,400
Employee Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares authorized 8.7    
Stock award period (years) 10 years    
Award vesting rights (percentage) 25.00%    
Award vesting period (years) 4 years    
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in usd per share) $ 117.12 $ 103.40 $ 91.96
Vested in period, fair value $ 28,100 $ 24,300 $ 22,200
Director | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period (years) 1 year