Stock-Based Compensation (Tables)

6 Months Ended

Mar. 26, 2016

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
	March 26, 2016		March 28, 2015		March 26, 2016		March 28, 2015
Cost of revenues	$	2.5	$	2.3	$	4.7	$	4.3
Research and development	2.6		2.2		5.0		4.1
Selling and marketing	2.7		2.3		5.2		4.3
General and administrative	6.9		6.9		15.7		13.0
Restructuring and divestiture	—		—		—		0.1
	$	14.7	$	13.7	$	30.6	$	25.8

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 26, 2016			March 28, 2015			March 26, 2016			March 28, 2015
Risk-free interest rate	1.6		%	1.7		%	1.6		%	1.7		%
Expected volatility	37.8		%	38.6		%	37.8		%	38.6		%
Expected life (in years)	4.7			5.3			4.7			5.3
Dividend yield	—			—			—			—
Weighted average fair value of options granted	$	11.80		$	10.36		$	12.98		$	9.55