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SEGMENT INFORMATION (Capital expenditures, depreciation, and amortization expense by segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 28, 2024
Sep. 30, 2023
Oct. 01, 2022
Capital expenditures:      
Capital expenditures $ 13,736 $ 47,702 $ 32,233
Depreciation expense:      
Depreciation expense 19,547 22,758 16,376
Amortization expense:      
Amortization expense 5,188 6,099 4,917
Ball Bonding Equipment      
Capital expenditures:      
Capital expenditures 1,548 1,087 978
Depreciation expense:      
Depreciation expense 1,363 1,538 1,398
Amortization expense:      
Amortization expense 0 0 0
APS      
Capital expenditures:      
Capital expenditures 1,177 5,298 4,964
Depreciation expense:      
Depreciation expense 5,352 6,166 6,632
Amortization expense:      
Amortization expense 917 896 994
Wedge Bonding Equipment      
Capital expenditures:      
Capital expenditures 699 436 1,450
Depreciation expense:      
Depreciation expense 1,003 1,169 981
Amortization expense:      
Amortization expense 0 0 0
Advanced Solutions      
Capital expenditures:      
Capital expenditures 804 30,522 19,036
Depreciation expense:      
Depreciation expense 5,945 7,706 2,034
Amortization expense:      
Amortization expense 0 0 0
All Others      
Capital expenditures:      
Capital expenditures 891 658 1,364
Depreciation expense:      
Depreciation expense 1,577 1,505 1,047
Amortization expense:      
Amortization expense 3,904 4,837 3,557
Corporate Expenses      
Capital expenditures:      
Capital expenditures 8,617 9,701 4,441
Depreciation expense:      
Depreciation expense 4,307 4,674 4,284
Amortization expense:      
Amortization expense $ 367 $ 366 $ 366