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Stock Option and Incentive Plan (Tables)

12 Months Ended

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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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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-Publisher FASB
-Name Accounting Standards Codification
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Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

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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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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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