Stock-Based Compensation (Tables)

3 Months Ended

Dec. 29, 2018

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
	December 29, 2018		December 30, 2017
Cost of revenues	$	2.0	$	2.2
Research and development	2.7		2.5
Selling and marketing	2.7		2.9
General and administrative	9.7		7.5
Restructuring	—		1.3
	$	17.1	$	16.4

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
	December 29, 2018			December 30, 2017
Risk-free interest rate	3.0		%	2.1		%
Expected volatility	34.3		%	35.3		%
Expected life (in years)	4.8			4.7
Dividend yield	—			—
Weighted average fair value of options granted	$	13.41		$	13.00