Stock-Based Compensation (Tables)

3 Months Ended

Dec. 31, 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
	December 31, 2016		December 26, 2015
Cost of revenues	$	2.8	$	2.2
Research and development	2.8		2.4
Selling and marketing	2.7		2.5
General and administrative	10.9		8.8
	$	19.2	$	15.9

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 31, 2016			December 26, 2015
Risk-free interest rate	1.8		%	1.6		%
Expected volatility	36.6		%	37.8		%
Expected life (in years)	4.7			4.7
Dividend yield	—			—
Weighted average fair value of options granted	$	12.18		$	13.13