Stock-Based Compensation (Tables)

6 Months Ended

Mar. 28, 2020

Share-based Payment Arrangement [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 28, 2020		March 30, 2019		March 28, 2020		March 30, 2019
Cost of revenues	$	1.7	$	2.0	$	3.8	$	4.0
Research and development	2.3		2.7		4.6		5.4
Selling and marketing	2.8		2.7		5.6		5.4
General and administrative	6.5		10.1		17.4		19.8
Restructuring	2.4		—		2.4		—
	$	15.7	$	17.5	$	33.8	$	34.6

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
	March 28, 2020			March 30, 2019			March 28, 2020			March 30, 2019
Risk-free interest rate	1.7		%	3.0		%	1.7		%	3.0		%
Expected volatility	33.6		%	34.3		%	33.6		%	34.3		%
Expected life (in years)	4.8			4.8			4.8			4.8
Dividend yield	—			—			—			—
Weighted average fair value of options granted	$	14.45		$	15.33		$	13.87		$	13.50