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Employee Benefit Plans (Narrative) (Details) - USD ($)
12 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award      
Number of shares authorized for grant 4,000,000.0    
Number of shares available for grant 2,200,000    
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Outstanding Contractual Terms 10 years    
Stock-based compensation expense $ 13,947,000 $ 14,890,000 $ 13,668,000
Stock-based compensation expense, related income tax benefits 4,600,000 4,600,000 4,200,000
Cash received from equity-based incentives exercised 0 600,000 1,500,000
Tax deduction from the exercise of equity-based incentives 4,800,000 5,200,000 5,200,000
RSU compensation expense $ 13,700,000 $ 14,800,000 $ 13,600,000
Weighted-average grant date fair value, Granted $ 78.42 $ 59.30 $ 61.06
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 505,082 496,329  
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Forfeited And Canceled In Period 44,772    
Awards vesting period, (in years) 3 years    
Total fair value of equity instruments other than options which vested $ 11,400,000 $ 15,400,000 $ 8,100,000
Equity instruments other than options, granted during period 240,658 [1] 275,539 455,806
Unrecognized stock-based compensation expense $ 16,800,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 187,133    
Performance Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award      
Equity instruments other than options, granted during period 18,563    
Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award      
Common stock shares authorized under ESPP 1,000,000    
Purchase price as a percentage of the market value 85.00%    
Maximum annual fair market value per employee $ 25,000    
Common stock shares issued to ESPP 512,540    
ESPP, holding period for shares purchased 1 year    
Retirement Savings Plan      
Share-based Compensation Arrangement by Share-based Payment Award      
Percentage of employer's matching contribution 50.00%    
Maximum percentage of participant's deferrals matched by Company 6.00%    
401(k) Savings Plan vesting period (years) 4 years    
Company's contribution to 401(k) $ 3,100,000 $ 2,800,000 $ 100,000
Minimum      
Share-based Compensation Arrangement by Share-based Payment Award      
Awards vesting period, (in years) 1 year    
Minimum | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award      
Awards vesting period, (in years) 1 year    
Maximum      
Share-based Compensation Arrangement by Share-based Payment Award      
Awards vesting period, (in years) 3 years    
Maximum | Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award      
Awards vesting period, (in years) 3 years    
[1] (a) Includes 18,563 shares of performance-based restricted stock units, which assumes maximum achievement.