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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 6 Months Ended
Jul. 02, 2017
Jul. 03, 2016
Jul. 02, 2017
Jul. 03, 2016
Segment Reporting Information [Line Items]        
Total net revenues $ 330,723 $ 311,655 $ 654,380 $ 621,911
Total segment contribution income 45,048 52,463 95,585 106,057
Corporate and unallocated costs (17,033) (16,418) (35,234) (33,134)
Amortization of intangible assets [1] (3,146) (4,166) (7,528) (8,331)
Stock-based compensation expense (5,701) (5,019) (10,829) (9,430)
Restructuring and other charges (22) (1,311) (59) (3,989)
Litigation reserves, net (53) (35) (53) (45)
Interest income 482 279 887 513
Other income (expense), net 383 (332) 718 (698)
Income before income taxes 19,958 25,461 43,487 50,943
Arlo [Member]        
Segment Reporting Information [Line Items]        
Total net revenues 78,732 38,585 [2] 139,444 62,850 [2]
Total segment contribution income $ 3,172 $ 389 [2] $ 3,493 $ (3,441) [2]
Segment contribution margin (in percentage) 4.00% 1.00% [2] 2.50% (5.50%) [2]
Connected Home [Member]        
Segment Reporting Information [Line Items]        
Total net revenues $ 185,905 $ 198,654 [2] $ 380,266 $ 414,764 [2]
Total segment contribution income $ 25,124 $ 33,228 [2] $ 56,836 $ 75,257 [2]
Segment contribution margin (in percentage) 13.50% 16.70% [2] 14.90% 18.10% [2]
SMB [Member]        
Segment Reporting Information [Line Items]        
Total net revenues $ 66,086 $ 74,416 [2] $ 134,670 $ 144,297 [2]
Total segment contribution income $ 16,752 $ 18,846 [2] $ 35,256 $ 34,241 [2]
Segment contribution margin (in percentage) 25.30% 25.30% [2] 26.20% 23.70% [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.