Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 9,150	$ 20,794	$ 9,510	$ 51,370
Other comprehensive income (loss), before tax:
Unrealized gains (losses) on derivative instruments	48	22	864	(7,678)
Unrealized gains (losses) on available-for-sale securities	41	41	72	(41)
Other comprehensive income (loss), before tax	89	63	936	(7,719)
Tax benefit (provision) related to derivative instruments	(8)	0	(84)	1,005
Tax benefit (provision) related to available-for-sale securities	(10)	(15)	(37)	14
Other comprehensive income (loss), net of tax	71	48	815	(6,700)
Comprehensive income	9,221	20,842	10,325	44,670
Comprehensive loss attributable to non-controlling interest	(797)	0	(797)	0
Comprehensive income attributable to NETGEAR, Inc.	$ 10,018	$ 20,842	$ 11,122	$ 44,670