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SEGMENT INFORMATION Long-lived assets by countries (Details) - USD ($)
$ in Thousands
Sep. 29, 2018
Sep. 30, 2017
Oct. 01, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-Lived Assets $ 87,673 $ 97,589 $ 69,420
United States [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-Lived Assets 23,696 43,440 18,570
Singapore [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-Lived Assets 30,240 31,553 33,286
China [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-Lived Assets 18,333 11,148 7,459
Israel [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-Lived Assets 8,460 4,549 4,810
All Other Segments [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-Lived Assets $ 6,944 $ 6,899 $ 5,295