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Segment Information (Schedule Of Reportable Segment And Reconciliation Of Segment Contribution Income To Income Before Income Taxes) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Oct. 01, 2017
Oct. 02, 2016
Oct. 01, 2017
Oct. 02, 2016
Segment Reporting Information [Line Items]        
Total net revenues $ 355,483 $ 338,458 $ 1,009,863 $ 960,369
Total segment contribution income 52,359 56,306 147,944 162,363
Corporate and unallocated costs (18,740) (17,532) (53,974) (50,666)
Amortization of intangible assets [1] (2,608) (4,165) (10,136) (12,496)
Stock-based compensation expense (5,583) (4,870) (16,412) (14,300)
Restructuring and other charges (19) 130 (78) (3,859)
Litigation reserves, net (15) (13) (68) (58)
Interest income 501 291 1,388 804
Other income (expense), net 666 116 1,384 (582)
Income before income taxes 26,561 30,263 70,048 81,206
Arlo [Member]        
Segment Reporting Information [Line Items]        
Total net revenues 110,460 48,642 [2] 249,904 111,492 [2]
Total segment contribution income $ 15,230 $ (771) [2] $ 18,723 $ (4,212) [2]
Segment contribution margin (in percentage) 13.80% (1.60%) [2] 7.50% (3.80%) [2]
Connected Home [Member]        
Segment Reporting Information [Line Items]        
Total net revenues $ 183,099 $ 215,116 [2] $ 563,365 $ 629,880 [2]
Total segment contribution income $ 24,546 $ 36,330 [2] $ 81,382 $ 111,587 [2]
Segment contribution margin (in percentage) 13.40% 16.90% [2] 14.40% 17.70% [2]
SMB [Member]        
Segment Reporting Information [Line Items]        
Total net revenues $ 61,924 $ 74,700 [2] $ 196,594 $ 218,997 [2]
Total segment contribution income $ 12,583 $ 20,747 [2] $ 47,839 $ 54,988 [2]
Segment contribution margin (in percentage) 20.30% 27.80% [2] 24.30% 25.10% [2]
[1] Amount excludes amortization expense related to patents within purchased intangibles in cost of revenue.
[2] Prior year financial information for each reportable segment has been recast to conform to the current reportable segment structure effective on January 1, 2017.