Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2018	Sep. 30, 2017	Sep. 29, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net loss	$ (2,056)	$ (113,403)	$ (201,201)	$ (231,722)
Cash flow hedges:
Change in unrealized gain (loss) on cash flow hedges, net of tax benefit (expense) of $43, $192, $709 and $(7), respectively	868	(6,793)	6,780	(20,582)
Less: reclassification for realized net gains included in net loss, net of tax expense (benefit) of $(115), $-, $(244) and $7, respectively	(2,334)	6,617	(3,362)	8,264
Net change, net of tax	(1,466)	(176)	3,418	(12,318)
Change in foreign currency translation adjustment	0	0	0	314
Change in unrealized gain (loss) on available-for-sale investments, net of tax	120	48	(88)	133
Less reclassification for realized net gain (loss)	0	0	12	(12)
Net change, net of tax	120	48	(76)	121
Comprehensive loss	$ (3,402)	$ (113,531)	$ (197,859)	$ (243,605)