Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Earnings Per Share, Basic and Diluted [Abstract]
Net income	$ 99,318	$ 81,157	$ 247,352	$ 218,543
Weighted-average common shares used to calculate basic net income per share (in shares)	273,716	273,156	273,718	271,739
Stock-based awards	7,930	8,244	7,673	7,815
Weighted average common shares used to calculate diluted net income per share (in shares)	281,646	281,400	281,391	279,554
Net income per share - basic (in usd per share)	$ 0.36	$ 0.30	$ 0.90	$ 0.80
Net income per share - diluted (in usd per share)	$ 0.35	$ 0.29	$ 0.88	$ 0.78