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Stock Option and Incentive Plan (Tables)

12 Months Ended

Sep. 30, 2020

Disclosure of Stock Option and Incentive Plan [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, 2020:

		Number of Share Options				Weighted Average Exercise Price
Outstanding as of October 1, 2019			6,837			$	56.65
Granted			1,133				69.53
Exercised			(1,871	)			52.28
Forfeited			(383	)			62.33
Outstanding as of September 30, 2020(1)			5,716			$	60.26
Exercisable as of September 30, 2020(1)			2,401			$	54.72

(1) As of September 30, 2020, the weighted average remaining contractual life of outstanding and exercisable options was 7.16 and 5.68 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, 2020:

		Number of Shares				Weighted Average Grant Date Fair Value
Outstanding as of October 1, 2019			937			$	61.70
Granted			659				70.03
Vested			(425	)			61.72
Forfeited			(74	)			63.61
Outstanding as of September 30, 2020			1,097			$	66.57

Employee Equity-Based Compensation Pre-Tax Expense

Employee equity-based compensation pre-tax expense for the years ended September 30, 2020, 2019 and 2018 was as follows:

		Year Ended September 30,
		2020				2019				2018
Cost of revenue		$	20,005			$	19,879			$	18,253
Research and development			3,058				2,714				3,476
Selling, general and administrative			19,371				15,957				25,747
Total		$	42,434			$	38,550			$	47,476

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,
		2020				2019				2018
Risk-free interest rate(1)			1.41	%			2.64	%			2.30	%
Expected life of stock options(2)			4.50				4.50				4.50
Expected volatility(3)			17.3	%			17.8	%			15.0	%
Expected dividend yield(4)			1.75	%			1.82	%			1.51	%
Fair value per option		$	8.85			$	9.13			$	8.70

(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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