v3.25.1
SEGMENT INFORMATION (Capital expenditures, depreciation and amortization expense by segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 29, 2025
Mar. 30, 2024
Mar. 29, 2025
Mar. 30, 2024
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Capital expenditures: $ 2,716 $ 3,846 $ 4,827 $ 7,379
Depreciation and amortization expense:        
Depreciation expense: 3,840 5,642 7,607 12,280
Amortization expense: 1,171 1,325 2,417 2,672
Ball Bonding Equipment        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Capital expenditures: 50 158 57 554
Depreciation and amortization expense:        
Depreciation expense: 332 326 664 647
Amortization expense: 0 0 0 0
Wedge Bonding Equipment        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Capital expenditures: 45 121 80 135
Depreciation and amortization expense:        
Depreciation expense: 228 252 455 536
Amortization expense: 0 0 0 0
Advanced Solutions        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Capital expenditures: 14 74 92 318
Depreciation and amortization expense:        
Depreciation expense: 281 2,321 516 5,368
Amortization expense: 0 0 0 0
APS        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Capital expenditures: 409 245 793 670
Depreciation and amortization expense:        
Depreciation expense: 1,313 1,302 2,712 2,625
Amortization expense: 245 231 526 457
All Others        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Capital expenditures: 239 286 387 427
Depreciation and amortization expense:        
Depreciation expense: 342 386 670 766
Amortization expense: 835 1,003 1,708 2,032
Corporate Expenses        
Segment Reporting, Other Significant Reconciling Item [Line Items]        
Capital expenditures: 1,959 2,962 3,418 5,275
Depreciation and amortization expense:        
Depreciation expense: 1,344 1,055 2,590 2,338
Amortization expense: $ 91 $ 91 $ 183 $ 183