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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

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482686/350-30-45-2 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482099/360-10-50-1 + Details
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- Definition Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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