Share-Based Compensation (Tables)

9 Months Ended

Oct. 03, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Number and Weighted Average Exercise Price of Options Issued and Outstanding under all Stock Option Plans

Share-Based Compensation

The number and weighted-average exercise price of options issued and outstanding under all of the Company’s stock option plans are as follows (in thousands, except for exercise prices):



	Nine Months Ended October 3, 2015
	Shares		Average Exercise Price
Options outstanding, beginning of period	9,956		$	23.59
Granted	781		$	35.28
Canceled	(196	)	$	24.51
Exercised	(1,252	)	$	19.92
Options outstanding, end of period	9,289		$	25.04
Options exercisable, end of period	5,524		$	24.62
Options available for grant, end of period	5,188

Range of Assumptions Used and Resulting Weighted-Average Fair Value of Options Granted at Date of Grant

The range of assumptions used and the resulting weighted-average fair value of options granted at the date of grant were as follows:



	Three Months Ended		Nine Months Ended
	October 3, 2015	September 27, 2014	October 3, 2015	September 27, 2014
Risk-free interest rate	1.5% to 1.8%	1.6% to 1.8%	1.3% to 1.9%	1.4% to 1.8%
Expected term (in years)	5.5	5.1	5.5	5.1
Estimated volatility	32.3% to 35.6%	31.7% to 32.1%	32.0% to 37.4%	31.7% to 33.1%
Expected dividends	0%	0%	0%	0%
Weighted-average fair value of options granted	$14.09	$6.79	$11.82	$7.85