Balance Sheet Components - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			$ 998,532
Other comprehensive income (loss)	$ 6	$ 67	73	$ 126
Balance, end of period	925,336		925,336
Unrealized Gains (Losses) on Cash Flow Hedges [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			(477)
Other comprehensive income (loss) before reclassifications			(13,789)
Amounts reclassified from AOCI			1,647
Other comprehensive income (loss)			(12,142)
Balance, end of period	(12,619)		(12,619)
Currency Translation Adjustments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			(314)
Other comprehensive income (loss) before reclassifications			314
Amounts reclassified from AOCI			0
Other comprehensive income (loss)			314
Balance, end of period	0		0
Unrealized Gains (Losses) on Available-for-Sale Investments [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			(187)
Other comprehensive income (loss) before reclassifications			85
Amounts reclassified from AOCI			(12)
Other comprehensive income (loss)			73
Balance, end of period	(114)		(114)
AOCI Attributable to Parent [Member]
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Balance, beginning of period			(978)
Other comprehensive income (loss) before reclassifications			(13,390)
Amounts reclassified from AOCI			1,635
Other comprehensive income (loss)			(11,755)
Balance, end of period	$ (12,733)		$ (12,733)