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Segment Information (Schedule Of Revenues From External Customers By Geographical Areas) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 29, 2018 | Sep. 29, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales to External Customers | $ 299,023 | $ 296,767 | $ 301,460 | $ 291,998 | $ 273,114 | $ 261,765 | $ 257,063 | $ 255,323 | $ 1,189,248 | $ 1,047,265 | $ 1,006,083
Greater China [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales to External Customers |  |  |  |  |  |  |  |  | 654,394 | 546,777 | 502,299
Southeast Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales to External Customers |  |  |  |  |  |  |  |  | 225,469 | 205,289 | 206,124
North Asia [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales to External Customers |  |  |  |  |  |  |  |  | 76,720 | 58,376 | 46,023
Asia Pacific [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales to External Customers |  |  |  |  |  |  |  |  | 956,583 | 810,442 | 754,446
Americas And Europe [Member] |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net Sales to External Customers |  |  |  |  |  |  |  |  | $ 232,665 | $ 236,823 | $ 251,637

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