SEGMENT INFORMATION (Capital expenditures, depreciation and amortization expense by segment) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jun. 29, 2024	Jul. 01, 2023	Jun. 29, 2024	Jul. 01, 2023
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	$ 3,266	$ 10,451	$ 10,645	$ 43,485
Depreciation and amortization expense:
Depreciation expense:	3,694	6,805	15,974	16,003
Amortization expense:	1,250	1,786	3,922	4,743
Ball Bonding Equipment
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	172	316	726	805
Depreciation and amortization expense:
Depreciation expense:	363	388	1,010	1,173
Amortization expense:	0	0	0	0
Wedge Bonding Equipment
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	495	83	630	403
Depreciation and amortization expense:
Depreciation expense:	228	304	764	878
Amortization expense:	0	0	0	0
Advanced Solutions
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	47	6,439	365	29,425
Depreciation and amortization expense:
Depreciation expense:	295	2,989	5,663	4,821
Amortization expense:	0	0	0	0
APS
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	157	1,251	827	4,443
Depreciation and amortization expense:
Depreciation expense:	1,332	1,517	3,957	4,742
Amortization expense:	227	380	684	1,116
All Others
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	412	30	839	279
Depreciation and amortization expense:
Depreciation expense:	398	416	1,164	1,017
Amortization expense:	931	1,314	2,963	3,352
Corporate Expenses
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	1,983	2,332	7,258	8,130
Depreciation and amortization expense:
Depreciation expense:	1,078	1,191	3,416	3,372
Amortization expense:	$ 92	$ 92	$ 275	$ 275

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.

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

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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.

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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.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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