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Stock Option and Incentive Plan (Tables)
12 Months Ended
Sep. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Option Activity

The following table summarizes information about options to purchase the Companys ordinary shares, as well as changes during the fiscal year ended September 30, 2015:

 

     Number of
Share
Options
     Weighted Average
Exercise Price
 

Outstanding as of October 1, 2014

     9,563       $ 33.72   

Granted

     2,418         49.49   

Exercised

     (2,540      30.94   

Forfeited

     (569      37.40   
  

 

 

    

Outstanding as of September 30, 2015(1)

     8,872       $ 38.58   
  

 

 

    

Exercisable as of September 30, 2015(1)

     3,230       $ 31.99   
  

 

 

    

 

(1) As of September 30, 2015, the weighted average remaining contractual life of outstanding and exercisable options was 7.26 and 5.37 years, respectively.
Summary of Restricted Shares Activity

The following table summarizes information relating to awards of restricted shares, as well as changes during the fiscal year ended September 30, 2015:

 

     Number of
Shares
     Weighted Average
Grant Date Fair
Value
 

Outstanding as of October 1, 2014

     1,886       $ 36.09   

Granted

     665         49.80   

Vested

     (810      34.62   

Forfeited

     (130      38.10   
  

 

 

    

Outstanding as of September 30, 2015

     1,611       $ 42.33   
  

 

 

    

Employee Equity-Based Compensation Pre-Tax Expense

Employee equity-based compensation pre-tax expense for the years ended September 30, 2015, 2014 and 2013 was as follows:

 

     Year Ended September 30,  
     2015      2014      2013  

Cost of revenue

   $ 15,621       $ 17,496       $ 18,284   

Research and development

     3,400         3,599         3,805   

Selling, general and administrative

     25,539         23,483         18,251   
  

 

 

    

 

 

    

 

 

 

Total

   $ 44,560       $ 44,578       $ 40,340   
  

 

 

    

 

 

    

 

 

 

Assumptions Used in Calculating Fair Value of Options

The fair value of options granted was estimated on the date of grant using the Black-Scholes pricing model with the assumptions noted in the following table (all in weighted averages for options granted during the year):

 

     Year Ended September 30,  
     2015     2014     2013  

Risk-free interest rate(1)

     1.26     1.30     0.74

Expected life of stock options(2)

     4.50        4.50        4.50   

Expected volatility(3)

     15.6     17.3     22.7

Expected dividend yield(4)

     1.37     1.45     1.48

Fair value per option

   $ 5.97      $ 5.56      $ 5.74   

 

(1) Risk-free interest rate is based upon U.S. Treasury yield curve appropriate for the term of the Company’s employee stock options.
(2) Expected life of stock options is based upon historical experience.
(3) Expected volatility is based on blended volatility. Please see Note 2 to the consolidated financial statements.
(4) Expected dividend yield is based on the Company’s history and future expectation of dividend payouts.