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Stock Option and Incentive Plan (Tables) | 12 Months Ended
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Sep. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Option Activity | The following table summarizes information about options to purchase the Company’s ordinary shares, as well as changes during the fiscal year ended September 30, 2017:
|  | Number of Share Options |  |  | Weighted Average Exercise Price |
Outstanding as of October 1, 2016 |  |  | 7,623 |  |  | $ | 44.20 |
Granted |  |  | 2,062 |  |  |  | 58.83 |
Exercised |  |  | (2,220 | ) |  |  | 39.63 |
Forfeited |  |  | (508 | ) |  |  | 50.60 |
Outstanding as of September 30, 2017(1) |  |  | 6,957 |  |  | $ | 49.52 |
Exercisable as of September 30, 2017(1) |  |  | 2,428 |  |  | $ | 40.33 |
(1) | As of September 30, 2017, the weighted average remaining contractual life of outstanding and exercisable options was 7.40 and 5.66 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, 2017:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Outstanding as of October 1, 2016 |  |  | 1,473 |  |  | $ | 49.50 |
Granted |  |  | 641 |  |  |  | 59.97 |
Vested |  |  | (629 | ) |  |  | 46.66 |
Forfeited |  |  | (89 | ) |  |  | 51.69 |
Outstanding as of September 30, 2017 |  |  | 1,396 |  |  | $ | 55.45 |
Employee Equity-Based Compensation Pre-Tax Expense | Employee equity-based compensation pre-tax expense for the years ended September 30, 2017, 2016 and 2015 was as follows:
|  | Year Ended September 30, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Cost of revenue |  | $ | 19,215 |  |  | $ | 18,249 |  |  | $ | 15,621 |
Research and development |  |  | 3,536 |  |  |  | 3,742 |  |  |  | 3,400 |
Selling, general and administrative |  |  | 21,788 |  |  |  | 20,709 |  |  |  | 25,539 |
Total |  | $ | 44,539 |  |  | $ | 42,700 |  |  | $ | 44,560 |
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, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Risk-free interest rate(1) |  |  | 1.63 | % |  |  | 1.40 | % |  |  | 1.26 | %
Expected life of stock options(2) |  |  | 4.50 |  |  |  | 4.50 |  |  |  | 4.50 |
Expected volatility(3) |  |  | 16.2 | % |  |  | 18.5 | % |  |  | 15.6 | %
Expected dividend yield(4) |  |  | 1.47 | % |  |  | 1.40 | % |  |  | 1.37 | %
Fair value per option |  | $ | 7.62 |  |  | $ | 7.97 |  |  | $ | 5.97 |
(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. 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.

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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