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Stock Option and Incentive Plan | 12 Months Ended
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Sep. 30, 2021
Disclosure of Stock Option and Incentive Plan [Abstract] |
Stock Option and Incentive Plan | Note 18 — Stock Option and Incentive Plan In January 1998, the Company adopted the 1998 Stock Option and Incentive Plan, or Equity Incentive Plan, which provides for the grant of restricted stock awards, stock options and other equity-based awards to employees, officers, directors, and consultants. Since its adoption, the Equity Incentive Plan has been amended on several occasions to, among other things, increase the number of ordinary shares issuable under the Equity Incentive Plan. In January 2020, the maximum number of ordinary shares authorized to be granted under the Equity Incentive Plan was increased from 67,550 to 70,550. Awards granted under the Equity Incentive Plan generally vest over a period of three to four years subject to service based conditions or a combination of service and performance based conditions and stock options have a term of ten years. Also, in accordance with the Equity Incentive Plan, options are issued at or above the market price at the time of the grant. 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, 2021:
|  | Number of Share Options |  |  | Weighted Average Exercise Price |
Outstanding as of October 1, 2020 |  |  | 5,716 |  |  | $ | 60.26 |
Granted |  |  | 62 |  |  |  | 60.77 |
Exercised |  |  | (1,541 | ) |  |  | 57.81 |
Forfeited |  |  | (249 | ) |  |  | 63.63 |
Outstanding as of September 30, 2021(1) |  |  | 3,988 |  |  | $ | 61.00 |
Exercisable as of September 30, 2021(1) |  |  | 2,119 |  |  | $ | 57.55 |
(1) | As of September 30, 2021, the weighted average remaining contractual life of outstanding and exercisable options was 6.42 and 5.40 years, respectively.
The following table summarizes information relating to awards of restricted shares, as well as changes during the fiscal year ended September 30, 2021:
|  | Number of Shares |  |  | Weighted Average Grant Date Fair Value |
Outstanding as of October 1, 2020 |  |  | 1,097 |  |  | $ | 66.57 |
Granted |  |  | 1,032 |  |  |  | 66.83 |
Vested |  |  | (426 | ) |  |  | 65.40 |
Forfeited |  |  | (116 | ) |  |  | 67.84 |
Outstanding as of September 30, 2021 |  |  | 1,587 |  |  | $ | 66.96 |
The total intrinsic value of options exercised during fiscal years 2021, 2020 and 2019 was $27,023, $31,220 and $ 13,081, respectively. The value of restricted shares vested during fiscal years 2021, 2020 and 2019 was $28,682, $28,727 and $28,430, respectively. The aggregate intrinsic value of outstanding and exercisable stock options as of September 30, 2021 was $58,644 and $38,482, respectively. Employee equity-based compensation pre-tax expense for the years ended September 30, 2021, 2020 and 2019 was as follows:
|  | Year Ended September 30, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Cost of revenue |  | $ | 22,691 |  |  | $ | 20,005 |  |  | $ | 19,879 |
Research and development |  |  | 4,021 |  |  |  | 3,058 |  |  |  | 2,714 |
Selling, general and administrative |  |  | 27,537 |  |  |  | 19,371 |  |  |  | 15,957 |
Total |  | $ | 54,249 |  |  | $ | 42,434 |  |  | $ | 38,550 |
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, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Risk-free interest rate(1) |  |  | 0.30 | % |  |  | 1.41 | % |  |  | 2.64 | %
Expected life of stock options(2) |  |  | 4.50 |  |  |  | 4.50 |  |  |  | 4.50 |
Expected volatility(3) |  |  | 21.3 | % |  |  | 17.3 | % |  |  | 17.8 | %
Expected dividend yield(4) |  |  | 2.22 | % |  |  | 1.75 | % |  |  | 1.82 | %
Fair value per option |  | $ | 7.82 |  |  | $ | 8.85 |  |  | $ | 9.13 |
(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.
(4) | Expected dividend yield is based on the Company’s history and future expectation of dividend payouts.

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