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Stock Option and Incentive Plan (Tables)

12 Months Ended

Sep. 30, 2019

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, 2019:

		Number of Share Options				Weighted Average Exercise Price
Outstanding as of October 1, 2018			6,418			$	54.76
Granted			1,975				60.04
Exercised			(874	)			47.41
Forfeited			(682	)			60.52
Outstanding as of September 30, 2019(1)			6,837			$	56.65
Exercisable as of September 30, 2019(1)			2,899			$	50.60

(1) As of September 30, 2019, the weighted average remaining contractual life of outstanding and exercisable options was 7.24 and 5.63 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, 2019:

		Number of Shares				Weighted Average Grant Date Fair Value
Outstanding as of October 1, 2018			1,022			$	60.68
Granted			521				61.65
Vested			(459	)			59.32
Forfeited			(147	)			61.86
Outstanding as of September 30, 2019			937			$	61.70

Employee Equity-Based Compensation Pre-Tax Expense

Employee equity-based compensation pre-tax expense for the years ended September 30, 2019, 2018 and 2017 was as follows:

		Year Ended September 30,
		2019				2018				2017
Cost of revenue		$	19,879			$	18,253			$	19,215
Research and development			2,714				3,476				3,536
Selling, general and administrative			15,957				25,747				21,788
Total		$	38,550			$	47,476			$	44,539

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,
		2019				2018				2017
Risk-free interest rate(1)			2.64	%			2.30	%			1.63	%
Expected life of stock options(2)			4.50				4.50				4.50
Expected volatility(3)			17.8	%			15.0	%			16.2	%
Expected dividend yield(4)			1.82	%			1.51	%			1.47	%
Fair value per option		$	9.13			$	8.70			$	7.62

(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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Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed.

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Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value.

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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.

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