Share-Based Compensation (Tables)

6 Months Ended

Jul. 04, 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):



	Six Months Ended July 4, 2015
	Shares		Average Exercise Price
Options outstanding, beginning of period	9,956		$	23.59
Granted	726		$	34.80
Canceled	(138	)	$	24.12
Exercised	(786	)	$	19.34
Options outstanding, end of period	9,758		$	24.75
Options exercisable, end of period	5,786		$	24.39
Options available for grant, end of period	5,185

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		Six Months Ended
	July 4, 2015	June 28, 2014	July 4, 2015	June 28, 2014
Risk-free interest rate	1.4% to 1.9%	1.5% 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	32.0% to 34.0%	32.2% to 33.1%	32.0% to 37.4%	31.8% to 33.1%
Expected dividends	0%	0%	0%	0%
Weighted-average fair value of options granted	$12.45	$7.6	$11.64	$8.65