Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Income Statement [Abstract]
Net revenue	$ 400,586	$ 355,483	$ 1,112,379	$ 1,009,863
Cost of revenue	276,394	252,388	774,510	717,900
Gross profit	124,192	103,095	337,869	291,963
Operating expenses:
Research and development	35,253	23,127	95,571	69,167
Sales and marketing	49,005	40,311	139,646	115,001
General and administrative	23,268	14,229	60,354	40,373
Separation expense	7,054	0	25,822	0
Restructuring and other charges	1	19	1,368	78
Litigation reserves, net	0	15	5	68
Total operating expenses	114,581	77,701	322,766	224,687
Income from operations	9,611	25,394	15,103	67,276
Interest income	1,490	501	3,310	1,388
Other income (expense), net	829	666	638	1,384
Income before income taxes	11,930	26,561	19,051	70,048
Provision for income taxes	2,780	5,767	9,541	18,678
Net income	9,150	20,794	9,510	51,370
Net loss attributable to non-controlling interest	(799)	0	(799)	0
Net income attributable to NETGEAR, Inc.	$ 9,949	$ 20,794	$ 10,309	$ 51,370
Net income per share attributable to NETGEAR Inc.:
Basic (in dollars per share)	$ 0.31	$ 0.66	$ 0.33	$ 1.59
Diluted (in dollars per share)	$ 0.30	$ 0.64	$ 0.31	$ 1.54
Weighted average shares used to compute net income per share attributable to NETGEAR Inc.:
Basic (in shares)	31,802	31,704	31,634	32,335
Diluted (in shares)	32,974	32,393	32,826	33,269