Stockholders' Equity and Stock-Based Compensation (Tables)

12 Months Ended

Sep. 29, 2018

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-Based Compensation Expense in Consolidated Statement of Operations

The following presents stock-based compensation expense in the Company’s Consolidated Statements of Operations in fiscal 2018, 2017 and 2016:



	2018		2017		2016
Cost of revenues	$	8.3	$	10.7	$	10.5
Research and development	9.5		11.2		10.8
Selling and marketing	10.3		11.9		10.9
General and administrative	35.6		34.4		32.8
Restructuring and divestiture	1.3		—		0.4
	$	65.0	$	68.2	$	65.4

Information Pertaining to Stock Options Granted and Related Assumptions

Information pertaining to stock options granted during fiscal 2018, 2017 and 2016 and related assumptions are noted in the following table:



	Years ended
	September 29, 2018			September 30, 2017			September 24, 2016
Options granted (in millions)	1.7			1.0			1.1
Weighted-average exercise price	$	40.76		$	38.07		$	39.32
Weighted-average grant date fair value	$	12.98		$	12.33		$	12.91
Assumptions:
Risk-free interest rates	2.1		%	1.8		%	1.6		%
Expected life (in years)	4.7			4.7			4.7
Expected volatility	35.3		%	36.6		%	37.8		%
Dividend yield	—			—			—

Stock Option Activity

The following table summarizes all stock option activity under the Company’s stock option plans for the year ended September 29, 2018:



	Number of Shares (in millions)		Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (in Years)	Aggregate Intrinsic Value (in millions)
Options outstanding at September 30, 2017	5.5		$	28.15	5.4	$	50.3
Granted	1.7		40.76
Canceled/ forfeited	(0.4	)	36.22
Exercised	(0.8	)	21.72			15.2
Options outstanding at September 29, 2018	6.0		$	32.13	5.9	$	53.3
Options exercisable at September 29, 2018	2.8		$	26.47	3.7	$	40.8
Options vested and expected to vest at September 29, 2018 (1)	5.9		$	32.08	5.9	$	52.8


(1)	This represents the number of vested stock options as of September 29, 2018 plus the unvested outstanding options at September 29, 2018 expected to vest in the future, adjusted for estimated forfeitures.

Restricted Stock Unit Activity

A summary of the Company’s RSU, PSU and MSU activity during the year ended September 29, 2018 is presented below:



Non-vested Shares	Number of Shares (in millions)		Weighted-Average Grant-Date Fair Value
Non-vested at September 30, 2017	3.0		$	34.58
Granted	1.7		42.49
Vested	(1.6	)	34.10
Forfeited	(0.4	)	38.28
Non-vested at September 29, 2018	2.7		$	40.02

Black-Scholes Model Weighted Average Assumptions Used to Estimate Fair Value of Shares to Be Issued as of Grant Date

The Company uses the Black-Scholes model to estimate the fair value of shares to be issued as of the grant date using the following weighted average assumptions:



	September 29, 2018		September 30, 2017		September 24, 2016
Assumptions:
Risk-free interest rates	1.62	%	0.72	%	0.34	%
Expected life (in years)	0.5		0.5		0.5
Expected volatility	25.0	%	24.9	%	27.2	%
Dividend yield	—		—		—