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Segment Information (Schedule Of Revenues From External Customers By Geographical Areas) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 27, 2020
Jun. 29, 2019
Jun. 27, 2020
Jun. 29, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net Sales to External Customers $ 258,991 $ 256,016 $ 525,610 $ 529,006
Greater China [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net Sales to External Customers 124,001 128,946 255,433 273,099
Southeast Asia Pacific [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net Sales to External Customers 59,459 53,960 116,381 108,475
North Asia [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net Sales to External Customers 25,852 22,575 53,103 44,803
Asia Pacific [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net Sales to External Customers 209,312 205,481 424,917 426,377
Americas And Europe [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net Sales to External Customers $ 49,679 $ 50,535 $ 100,693 $ 102,629