Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Earnings Per Share, Basic and Diluted [Abstract]
Net income	$ 75,149	$ 69,127	$ 148,034	$ 137,386
Weighted-average common shares used to calculate basic net income per share (in shares)	273,564	271,887	273,703	271,030
Stock-based awards	7,210	7,639	7,544	7,601
Weighted average common shares used to calculate diluted net income per share (in shares)	280,774	279,526	281,247	278,631
Net income per share - basic (in usd per share)	$ 0.27	$ 0.25	$ 0.54	$ 0.51
Net income per share - diluted (in usd per share)	$ 0.27	$ 0.25	$ 0.53	$ 0.49