Stock-Based Compensation (Tables)

3 Months Ended

Dec. 30, 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
	December 30, 2017		December 31, 2016
Cost of revenues	$	2.2	$	2.8
Research and development	2.5		2.8
Selling and marketing	2.9		2.7
General and administrative	7.5		10.9
Restructuring	1.3		—
	$	16.4	$	19.2

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 30, 2017			December 31, 2016
Risk-free interest rate	2.1		%	1.8		%
Expected volatility	35.3		%	36.6		%
Expected life (in years)	4.7			4.7
Dividend yield	—			—
Weighted average fair value of options granted	$	13.00		$	12.18