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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.

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