Stock-Based Compensation (Tables)

3 Months Ended

Dec. 26, 2015

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 26, 2015		December 27, 2014
Cost of revenues	$	2.2	$	2.0
Research and development	2.4		1.9
Selling and marketing	2.5		2.0
General and administrative	8.8		6.1
Restructuring and divestiture	—		0.1
	$	15.9	$	12.1

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 26, 2015			December 27, 2014
Risk-free interest rate	1.6		%	1.7		%
Expected volatility	37.8		%	38.6		%
Expected life (in years)	4.7			5.3
Dividend yield	—			—
Weighted average fair value of options granted	$	13.13		$	9.44