Stockholders' Equity (Tables)

12 Months Ended

Sep. 27, 2019

Stockholders' Equity Note [Abstract]

Dividends Declared

The dividends charged to retained earnings in fiscal 2019 and 2018 were as follows (in millions except per share amounts):

	Fiscal Years Ended
	September 27, 2019				September 28, 2018
	Per Share		Total		Per Share		Total
First quarter	$	0.38	$	67.1	$	0.32	$	58.8
Second quarter	0.38		66.0		0.32		58.5
Third quarter	0.38		65.7		0.32		57.8
Fourth quarter	0.44		75.1		0.38		68.1
	$	1.58	$	273.9	$	1.34	$	243.2

Schedule of Share-based Compensation, Stock Options, Activity

The following table represents a summary of the Company’s stock options:

	Shares (in millions)		Weighted average exercise price		Weighted average remaining contractual life (in years)	Aggregate intrinsic value (in millions)
Balance outstanding at September 28, 2018	1.9		$	57.12
Granted	—		$	82.64
Exercised	(0.6	)	$	37.31
Canceled/forfeited	—		$	82.46
Balance outstanding at September 27, 2019	1.3		$	65.38	2.6	$	19.5
Exercisable at September 27, 2019	1.0		$	63.46	2.2	$	17.5

Schedule of Other Share-based Compensation, Activity

The following table represents a summary of the Company’s restricted and performance awards and units:

	Shares (In millions)		Weighted average     grant date fair value
Non-vested awards outstanding at September 28, 2018	2.7		$	92.37
Granted (1)	1.5		$	78.41
Vested	(0.8	)	$	85.95
Canceled/forfeited	(0.5	)	$	91.24
Non-vested awards outstanding at September 27, 2019	2.9		$	87.22
(1) includes performance shares granted and earned assuming maximum performance under the underlying performance metrics

Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value

	Fiscal Years Ended
	September 27, 2019		September 28, 2018		September 29, 2017
Awards	$	67.7	$	134.4	$	137.8
Options	$	26.4	$	75.0	$	116.1

Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs

The following table summarizes pre-tax share-based compensation expense by financial statement line and related tax benefit (in millions):

	Fiscal Years Ended
	September 27, 2019		September 28, 2018		September 29, 2017
Cost of goods sold	$	13.0	$	14.4	$	13.6
Research and development	41.6		42.6		35.3
Selling, general and administrative	25.5		50.8		39.6
Total share-based compensation expense	$	80.1	$	107.8	$	88.5
Share-based compensation tax benefit	$	1.6	$	25.6	$	25.1
Capitalized share-based compensation expense at period end	$	4.7	$	2.9	$	4.0

Schedule of Unrecognized Compensation Cost, Nonvested Awards

The following table summarizes total compensation costs related to unvested share-based awards not yet recognized and the weighted average period over which it is expected to be recognized at September 27, 2019:

	Unrecognized compensation cost for unvested awards (in millions)		Weighted average remaining recognition period (in years)
Awards	$	129.6	1.7
Options	$	2.6	0.7

Schedule of Share-based Payment Awards, Performance Shares, Valuation Assumptions Used

The fair value of these performance share units was estimated on the date of the grant using a Monte Carlo simulation with the following weighted average assumptions:

	Fiscal Year Ended
	September 27, 2019		September 28, 2018		September 29, 2017
Volatility of common stock	32.65	%	35.54	%	39.60	%
Average volatility of peer companies	37.07	%	36.78	%	39.78	%
Average correlation coefficient of peer companies	0.47		0.47		0.42
Risk-free interest rate	2.98	%	1.74	%	0.68	%
Dividend yield	1.84	%	1.15	%	1.44	%

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

The fair value of each stock option is estimated on the date of the grant using the Black-Scholes option pricing model with the following weighted average assumptions:

	Fiscal Years Ended
	September 27, 2019		September 28, 2018		September 29, 2017
Expected volatility	34.47	%	35.86	%	40.31	%
Risk-free interest rate	2.76	%	2.00	%	1.60	%
Dividend yield	1.84	%	1.15	%	1.44	%
Expected option life (in years)	4.0		4.0		4.0