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Net Income (Loss) Per Share (Schedule Of Net Income Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jul. 01, 2018
Apr. 01, 2018
Dec. 31, 2017
Oct. 01, 2017
Jul. 02, 2017
Apr. 02, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Numerator:                      
Net income (loss) from continuing operations $ (535) $ 16,310 $ 533 $ 1,018 $ (41,778) $ 9,624 $ 9,989 $ 11,032 $ 17,326 $ (11,133) $ 70,312
Net income (loss) from discontinued operations, net of tax                 (35,655) 30,569 5,539
Net income (loss) (27,839) 9,150 (5,230) 5,590 $ (31,934) $ 20,794 $ 14,582 $ 15,994 (18,329) 19,436 75,851
Net loss attributable to non-controlling interest in discontinued operations                 (9,167) 0 0
Net income (loss) attributable to NETGEAR, Inc. $ (19,471) $ 9,949 $ (5,230) $ 5,590         $ (9,162) $ 19,436 $ 75,851
Denominator:                      
Weighted average common shares - basic (in shares)                 31,626 32,097 32,758
Potentially dilutive common share equivalent (in shares)                 1,511 0 970
Weighted average common shares - dilutive (in shares)                 33,137 32,097 33,728
Basic net income (loss) per share                      
Net income (loss) from continuing operations per share - basic (in dollars per share) $ (0.02) $ 0.51 $ 0.02 $ 0.03 $ (1.33) $ 0.30 $ 0.31 $ 0.33 $ 0.55 $ (0.35) $ 2.15
Net income (loss) from discontinued operation attributable to NETGEAR, Inc. - basic (in dollars per share)                 (0.84) 0.96 0.17
Net income (loss) attributable to Netgear per share - basic (in dollars per share) (0.62) 0.31 (0.17) 0.18 (1.02) 0.66 0.45 0.49 (0.29) 0.61 2.32
Diluted net income (loss) per share                      
Net income (loss) from continuing operations - diluted (in dollars per share) (0.02) 0.49 0.02 0.03 (1.33) 0.30 0.30 0.32 0.52 (0.35) 2.08
Net income (loss) from discontinued operations attributable to NETGEAR, Inc. - diluted (in dollars per share)                 (0.80) 0.96 0.17
Net income (loss) attributable to Netgear per share - diluted (in dollars per share) $ (0.62) $ 0.30 $ (0.16) $ 0.17 $ (1.02) $ 0.64 $ 0.44 $ 0.47 $ (0.28) $ 0.61 $ 2.25
Anti-dilutive employee stock-based awards, excluded (in shares)                 815 279 258