SEGMENT INFORMATION Sales by country (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 28, 2024	Sep. 30, 2023	Oct. 01, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Total destination sales to unaffiliated customers	$ 706,232	$ 742,491	$ 1,503,620
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total destination sales to unaffiliated customers	416,695	335,393	855,345
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Total destination sales to unaffiliated customers	66,147	65,705	83,906
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total destination sales to unaffiliated customers	59,288	66,358	123,995
Malaysia
Revenues from External Customers and Long-Lived Assets [Line Items]
Total destination sales to unaffiliated customers	54,275	64,013	126,520
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total destination sales to unaffiliated customers	12,778	35,849	18,092
Philippines
Revenues from External Customers and Long-Lived Assets [Line Items]
Total destination sales to unaffiliated customers	10,585	31,527	44,510
Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Total destination sales to unaffiliated customers	11,563	17,977	87,647
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Total destination sales to unaffiliated customers	11,743	13,933	27,216
All others
Revenues from External Customers and Long-Lived Assets [Line Items]
Total destination sales to unaffiliated customers	$ 63,158	$ 111,736	$ 136,389