Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (118,268)	$ (58,240)	$ (199,145)	$ (118,319)
Cash flow hedges:
Change in unrealized gain (loss) on cash flow hedges, net of tax benefit (expense) of $(666), $404, $(666) and $202, respectively	5,248	(12,629)	5,912	(13,789)
Less: reclassification for realized net gains included in net loss, net of tax expense (benefit) of $130, $(46), $130 and $(8), respectively	(1,028)	1,430	(1,028)	1,647
Net change, net of tax	4,220	(11,199)	4,884	(12,142)
Change in foreign currency translation adjustment	0	585	0	314
Change in unrealized loss on available-for-sale investments, net of tax	118	9	(208)	85
Less reclassification for realized net gains	12	(3)	12	(12)
Net change, net of tax	130	6	(196)	73
Comprehensive loss	$ (113,918)	$ (68,848)	$ (194,457)	$ (130,074)