Stock-Based Compensation (Tables)

6 Months Ended

Mar. 30, 2019

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 Operations:



	Three Months Ended				Six Months Ended
	March 30, 2019		March 31, 2018		March 30, 2019		March 31, 2018
Cost of revenues	$	2.0	$	2.5	$	4.0	$	4.7
Research and development	2.7		2.9		5.4		5.4
Selling and marketing	2.7		2.5		5.4		5.4
General and administrative	10.1		11.6		19.8		19.1
Restructuring	—		—		—		1.3
	$	17.5	$	19.5	$	34.6	$	35.9

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
	March 30, 2019			March 31, 2018			March 30, 2019			March 31, 2018
Risk-free interest rate	3.0		%	2.1		%	3.0		%	2.1		%
Expected volatility	34.3		%	35.3		%	34.3		%	35.3		%
Expected life (in years)	4.8			4.7			4.8			4.7
Dividend yield	—			—			—			—
Weighted average fair value of options granted	$	15.33		$	12.53		$	13.50		$	12.98