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SEGMENT INFORMATION (Capital expenditures, depreciation, and amortization expense by segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Oct. 01, 2022
Oct. 02, 2021
Oct. 03, 2020
Capital expenditures:      
Capital expenditures $ 32,233 $ 22,555 $ 14,514
Depreciation expense:      
Depreciation expense 16,376 13,836 12,368
Amortization expense:      
Amortization expense 4,917 5,974 7,371
Ball Bonding Equipment      
Capital expenditures:      
Capital expenditures 978 1,627 1,586
Depreciation expense:      
Depreciation expense 1,398 1,153 758
Amortization expense:      
Amortization expense 0 0 0
Wedge Bonding Equipment      
Capital expenditures:      
Capital expenditures 1,450 387 607
Depreciation expense:      
Depreciation expense 981 940 933
Amortization expense:      
Amortization expense 0 0 0
Advanced Solutions      
Capital expenditures:      
Capital expenditures 19,036 6,090 214
Depreciation expense:      
Depreciation expense 2,034 845 487
Amortization expense:      
Amortization expense 0 0 0
APS      
Capital expenditures:      
Capital expenditures 4,964 5,286 8,131
Depreciation expense:      
Depreciation expense 6,632 5,969 4,951
Amortization expense:      
Amortization expense 994 2,319 3,416
All Others      
Capital expenditures:      
Capital expenditures 1,364 1,046 1,767
Depreciation expense:      
Depreciation expense 1,047 1,179 1,252
Amortization expense:      
Amortization expense 3,557 3,369 3,955
Corporate Expenses      
Capital expenditures:      
Capital expenditures 4,441 8,119 2,209
Depreciation expense:      
Depreciation expense 4,284 3,750 3,987
Amortization expense:      
Amortization expense $ 366 $ 286 $ 0