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Stock-Based Compensation (Tables)
12 Months Ended
Jan. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Option Activity

A summary of stock option activity under the Option Plan and the Stock Incentive Plan for fiscal 2014 is as follows:

 

     Options      Weighted-Average
Exercise Price
 

Outstanding—February 1, 2014

     9,147,306       $ 46.46  

Granted

     1,262,735         62.97   

Exercised

     (1,603,534      39.50   

Forfeited

     (54,882      57.00   

Retired

     (2,035,319      46.06   
  

 

 

    

Outstanding—January 31, 2015

     6,716,306       $ 51.26  
  

 

 

    
Schedule of Assumptions Used to Estimate Fair Value of Stock Options Issued

The fair value of stock options issued during fiscal 2014, fiscal 2013 and fiscal 2012 was estimated on the date of grant using the following assumptions:

 

     Fiscal 2014     Fiscal 2013     Fiscal 2012  

Expected volatility

     39.7     39.7     35.4

Expected life (years)

     6.5        6.7        5.3   

Risk-free interest rate

     2.0     1.9     1.6

Dividend yield

     —         —         —    
Summary of Additional Information about Stock Options

A summary of additional information about stock options is as follows:

 

     Fiscal 2014      Fiscal 2013      Fiscal 2012  

Weighted-average fair value per share of stock options granted

   $ 26.92       $ 30.49       $ 6.34   

Aggregate intrinsic value of stock options exercised (in thousands)

   $ 62,015       $ 11,623       $ —    

Fair value of stock options vested (in thousands)

   $ 2,246       $ 33,871       $ 51,063   
Schedule of Stock Options Outstanding, Vested or Expected to Vest, and Exercisable

Information about stock options outstanding, vested or expected to vest, and exercisable as of January 31, 2015 is as follows:

 

     Options Outstanding      Options Exercisable  

Range of Exercise Prices

   Number of
Options
     Weighted-
Average
Remaining
Contractual
Life (in years)
     Weighted-
Average
Exercise Price
     Number of
Options
     Weighted-
Average
Exercise Price
 

$24.00 - $29.00

     1,113,820         7.73       $ 27.56         1,113,820       $ 27.56   

$32.35 - $39.00

     98,125         7.75         34.02         2,125         32.61   

$46.50 - $46.50

     2,976,826         7.75         46.50         2,976,826         46.50   

$56.27 - $74.03

     1,408,400         9.11         61.52         52,825         62.28   

$75.43 - $87.48

     1,119,135         8.50         76.12         1,009,000         75.44   
  

 

 

          

 

 

    

Total

     6,716,306         8.16       $ 51.26         5,154,596       $ 48.23   
  

 

 

          

 

 

    

Vested or expected to vest

     6,566,625         8.13       $ 50.99         
  

 

 

             
Summary of Restricted Stock Award Activity

A summary of restricted stock award activity under the Stock Incentive Plan for fiscal 2014 is as follows:

 

     Options      Weighted-Average
Grant Date Fair  Value
     Intrinsic Value  

Outstanding—February 1, 2014

     289,747       $ 65.36      

Granted

     562,832         63.59      

Released

     (96,186      64.17      

Cancelled

     (36,395      66.25      
  

 

 

       

Outstanding—January 31, 2015

     719,998       $ 64.09       $ 63,021,425   
  

 

 

       
Summary of Additional Information about Restricted Stock Awards

A summary of additional information about restricted stock awards is as follows:

 

     Fiscal 2014      Fiscal 2013      Fiscal 2012  

Weighted-average fair value per share of awards granted

   $ 63.59       $ 65.37       $ 24.00   

Grant date fair value of awards released (in thousands)

   $ 6,172       $ 760       $ 975