Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 03, 2016	Mar. 29, 2015
Numerator for basic net income per share:
Net income	$ 78,353	$ 39,025
Denominator for basic net income per share:
Weighted-average common shares outstanding	201,928	211,428
Basic net income per share	$ 0.39	$ 0.18
Numerator for diluted net income per share:
Net income	$ 78,353	$ 39,025
Denominator for diluted net income per share:
Weighted-average common shares outstanding	201,928	211,428
Incremental common shares attributable to exercise of outstanding employee stock options, SARs and ESPP (assuming proceeds would be used to purchase common stock), and RSUs	2,002	2,581
1.5% Notes due 2017	5,858	7,427
Warrants issued in conjunction with the 1.5% Notes due 2017	135	2,613
Shares used in computing diluted net income per share	209,923	224,049
Diluted net income per share	$ 0.37	$ 0.17
Antidilutive Shares
Anti-dilutive shares excluded from net income per share calculation	34,702	34,262