Net Loss per Share - Schedule of Basic and Diluted EPS (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
Numerator:
Net loss	$ (118,268)	$ (58,240)	$ (199,145)	$ (118,319)
Denominator:
Weighted-average shares of common stock—basic (in shares)	242,898	230,322	241,227	228,788
Effect of dilutive securities (in shares)	0	0	0	0
Weighted-average shares of common stock—diluted (in shares)	242,898	230,322	241,227	228,788
Net loss per share:
Basic (in dollars per share)	$ (0.49)	$ (0.25)	$ (0.83)	$ (0.52)
Diluted (in dollars per share)	$ (0.49)	$ (0.25)	$ (0.83)	$ (0.52)