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Revenue Recognition (Income Statement Impact) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Jul. 01, 2018
Apr. 01, 2018
Oct. 01, 2017
Jul. 02, 2017
Apr. 02, 2017
Sep. 30, 2018
Oct. 01, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                
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
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 $ (5,230) $ 5,590 $ 20,794 $ 14,582 $ 15,994 10,309 $ 51,370
Adjustments | Accounting Standards Update 2014-09                
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                
Net revenue 2,278           5,974  
Cost of revenue (569)           (123)  
Gross profit 2,847           6,097  
Provision for income taxes 744           1,507  
Net income 2,103           4,590  
Net loss attributable to non-controlling interest 332           332  
Net income attributable to NETGEAR, Inc. 1,771           4,258  
Balance without adoption of ASC 606                
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]                
Net revenue 402,864           1,118,353  
Cost of revenue 275,825           774,387  
Gross profit 127,039           343,966  
Provision for income taxes 3,524           11,048  
Net income 11,253           14,100  
Net loss attributable to non-controlling interest (467)           (467)  
Net income attributable to NETGEAR, Inc. $ 11,720           $ 14,567