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SEGMENT INFORMATION (Capital expenditures, depreciation and amortization expense by segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 28, 2024
Dec. 30, 2023
Segment Reporting, Other Significant Reconciling Item [Line Items]    
Capital expenditures: $ 2,111 $ 3,533
Depreciation and amortization expense:    
Depreciation expense: 3,767 6,638
Amortization expense: 1,246 1,347
Ball Bonding Equipment    
Segment Reporting, Other Significant Reconciling Item [Line Items]    
Capital expenditures: 7 396
Depreciation and amortization expense:    
Depreciation expense: 332 321
Amortization expense: 0 0
Wedge Bonding Equipment    
Segment Reporting, Other Significant Reconciling Item [Line Items]    
Capital expenditures: 35 14
Depreciation and amortization expense:    
Depreciation expense: 227 284
Amortization expense: 0 0
Advanced Solutions    
Segment Reporting, Other Significant Reconciling Item [Line Items]    
Capital expenditures: 78 244
Depreciation and amortization expense:    
Depreciation expense: 235 3,047
Amortization expense: 0 0
APS    
Segment Reporting, Other Significant Reconciling Item [Line Items]    
Capital expenditures: 384 425
Depreciation and amortization expense:    
Depreciation expense: 1,399 1,323
Amortization expense: 281 226
All Others    
Segment Reporting, Other Significant Reconciling Item [Line Items]    
Capital expenditures: 148 141
Depreciation and amortization expense:    
Depreciation expense: 328 380
Amortization expense: 873 1,029
Corporate Expenses    
Segment Reporting, Other Significant Reconciling Item [Line Items]    
Capital expenditures: 1,459 2,313
Depreciation and amortization expense:    
Depreciation expense: 1,246 1,283
Amortization expense: $ 92 $ 92