Stock-Based Compensation (Tables)

6 Months Ended

Jul. 02, 2016

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

Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]

The number of RSUs issued and outstanding under all of the Company’s stock option plans are as follows (in thousands, except for grant date fair value amounts):



	Six Months Ended July 2, 2016
	Units	Weighted Average Grant Date Fair Value
RSUs outstanding, beginning of period	2,703	$	41.45
Granted	6	43.09
Canceled	—	—
Expired	—	—
Vested	—	—
RSUs outstanding, end of period	2,709	$	41.45

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

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 2, 2016
	Shares		Average Exercise Price
Options outstanding, beginning of period	9,202		$	25.46
Granted	1,189		38.33
Canceled	(120	)	28.61
Exercised	(965	)	19.83
Options outstanding, end of period	9,306		$	27.64
Options exercisable, end of period	5,358		$	25.87

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 2, 2016	July 4, 2015	July 2, 2016	July 4, 2015
Risk-free interest rate	1.1% to 1.5%	1.4% to 1.9%	1.1% to 1.9%	1.3% to 1.9%
Expected term (in years)	5.7	5.5	5.7	5.5
Estimated volatility	31.7% to 32.8%	32.0% to 34.0%	31.7% to 35.7%	32.0% to 37.4%
Expected dividends	0%	0%	0%	0%
Weighted-average fair value of options granted	$14.70	$12.45	$13.24	$11.64