SEGMENT INFORMATION Long-lived assets by countries (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Sep. 29, 2018	Sep. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 87,523	$ 87,673	$ 97,589
Singapore [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	25,620	30,240	31,553
United States [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	27,665	23,696	43,440
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	18,969	18,333	11,148
Israel [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	8,288	8,460	4,549
All Other Segments [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-Lived Assets	$ 6,981	$ 6,944	$ 6,899