Stock-Based Compensation (Tables)

6 Months Ended

Apr. 01, 2017

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

Stock-Based Compensation Expense in Consolidated Statements of Operations

The following presents stock-based compensation expense in the Company’s Consolidated Statements of Income:



	Three Months Ended				Six Months Ended
	April 1, 2017		March 26, 2016		April 1, 2017		March 26, 2016
Cost of revenues	$	3.6	$	2.5	$	6.4	$	4.7
Research and development	4.1		2.6		6.9		5.0
Selling and marketing	3.2		2.7		5.9		5.2
General and administrative	8.9		6.9		19.8		15.7
	$	19.8	$	14.7	$	39.0	$	30.6

Weighted-Average Assumptions Utilized to Value Stock Options

The Company uses a binomial model to determine the fair value of its stock options. The weighted-average assumptions utilized to value these stock options are indicated in the following table:



	Three Months Ended						Six Months Ended
	April 1, 2017			March 26, 2016			April 1, 2017			March 26, 2016
Risk-free interest rate	1.8		%	1.6		%	1.8		%	1.6		%
Expected volatility	36.5		%	37.8		%	36.6		%	37.8		%
Expected life (in years)	4.7			4.7			4.7			4.7
Dividend yield	—			—			—			—
Weighted average fair value of options granted	$	13.44		$	11.80		$	12.28		$	12.98