SEGMENT INFORMATION (Capital expenditures, depreciation and amortization expense by segment) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Mar. 30, 2024	Apr. 01, 2023	Mar. 30, 2024	Apr. 01, 2023
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	$ 3,846	$ 17,383	$ 7,379	$ 33,034
Depreciation and amortization expense:
Depreciation expense:	5,642	4,979	12,280	9,198
Amortization expense:	1,325	1,563	2,672	2,957
Ball Bonding Equipment
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	158	305	554	489
Depreciation and amortization expense:
Depreciation expense:	326	409	647	785
Amortization expense:	0	0	0	0
Wedge Bonding Equipment
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	121	136	135	321
Depreciation and amortization expense:
Depreciation expense:	252	300	536	575
Amortization expense:	0	0	0	0
Advanced Solutions
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	74	11,284	318	22,991
Depreciation and amortization expense:
Depreciation expense:	2,321	1,214	5,368	1,832
Amortization expense:	0	0	0	0
APS
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	245	1,867	670	3,192
Depreciation and amortization expense:
Depreciation expense:	1,302	1,616	2,625	3,225
Amortization expense:	231	377	457	736
All Others
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	286	82	427	248
Depreciation and amortization expense:
Depreciation expense:	386	333	766	602
Amortization expense:	1,003	1,095	2,032	2,038
Corporate Expenses
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	2,962	3,709	5,275	5,793
Depreciation and amortization expense:
Depreciation expense:	1,055	1,107	2,338	2,179
Amortization expense:	$ 91	$ 91	$ 183	$ 183

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://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482686/350-30-45-2

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482665/350-30-50-2

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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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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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