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SEGMENT INFORMATION (Capital expenditures, depreciation and amortization expense by segment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 28, 2025 | Jun. 29, 2024 | Jun. 28, 2025 | Jun. 29, 2024
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Capital expenditures: | $ 2,733 | $ 3,266 | $ 7,560 | $ 10,645
Depreciation and amortization expense: |  |  |  |
Depreciation expense: | 3,609 | 3,694 | 11,216 | 15,974
Amortization expense: | 308 | 1,250 | 2,725 | 3,922
Ball Bonding Equipment |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Capital expenditures: | 19 | 172 | 76 | 726
Depreciation and amortization expense: |  |  |  |
Depreciation expense: | 321 | 363 | 985 | 1,010
Amortization expense: | 0 | 0 | 0 | 0
Wedge Bonding Equipment |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Capital expenditures: | 211 | 495 | 291 | 630
Depreciation and amortization expense: |  |  |  |
Depreciation expense: | 219 | 228 | 674 | 764
Amortization expense: | 0 | 0 | 0 | 0
Advanced Solutions |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Capital expenditures: | 32 | 47 | 124 | 365
Depreciation and amortization expense: |  |  |  |
Depreciation expense: | 277 | 295 | 793 | 5,663
Amortization expense: | 0 | 0 | 0 | 0
APS |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Capital expenditures: | 441 | 157 | 1,234 | 827
Depreciation and amortization expense: |  |  |  |
Depreciation expense: | 1,209 | 1,332 | 3,921 | 3,957
Amortization expense: | 0 | 227 | 526 | 684
All others |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Capital expenditures: | 390 | 412 | 777 | 839
Depreciation and amortization expense: |  |  |  |
Depreciation expense: | 255 | 398 | 925 | 1,164
Amortization expense: | 216 | 931 | 1,924 | 2,963
Corporate Expenses |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |
Capital expenditures: | 1,640 | 1,983 | 5,058 | 7,258
Depreciation and amortization expense: |  |  |  |
Depreciation expense: | 1,328 | 1,078 | 3,918 | 3,416
Amortization expense: | $ 92 | $ 92 | $ 275 | $ 275

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