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SEGMENT INFORMATION (Capital expenditures, depreciation, and amortization expense by segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Oct. 01, 2022
Oct. 02, 2021
Capital expenditures:      
Capital expenditures $ 47,702 $ 32,233 $ 22,555
Depreciation expense:      
Depreciation expense 22,758 16,376 13,836
Amortization expense:      
Amortization expense 6,099 4,917 5,974
Ball Bonding Equipment      
Capital expenditures:      
Capital expenditures 1,087 978 1,627
Depreciation expense:      
Depreciation expense 1,538 1,398 1,153
Amortization expense:      
Amortization expense 0 0 0
APS      
Capital expenditures:      
Capital expenditures 5,298 4,964 5,286
Depreciation expense:      
Depreciation expense 6,166 6,632 5,969
Amortization expense:      
Amortization expense 896 994 2,319
Wedge Bonding Equipment      
Capital expenditures:      
Capital expenditures 436 1,450 387
Depreciation expense:      
Depreciation expense 1,169 981 940
Amortization expense:      
Amortization expense 0 0 0
Advanced Solutions      
Capital expenditures:      
Capital expenditures 30,522 19,036 6,090
Depreciation expense:      
Depreciation expense 7,706 2,034 845
Amortization expense:      
Amortization expense 0 0 0
All Others      
Capital expenditures:      
Capital expenditures 658 1,364 1,046
Depreciation expense:      
Depreciation expense 1,505 1,047 1,179
Amortization expense:      
Amortization expense 4,837 3,557 3,369
Corporate Expenses      
Capital expenditures:      
Capital expenditures 9,701 4,441 8,119
Depreciation expense:      
Depreciation expense 4,674 4,284 3,750
Amortization expense:      
Amortization expense $ 366 $ 366 $ 286