SEGMENT INFORMATION (Capital expenditures, depreciation and amortization expense by segment) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Jul. 01, 2023	Jul. 02, 2022	Jul. 01, 2023	Jul. 02, 2022
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	$ 10,451	$ 4,953	$ 43,485	$ 11,213
Depreciation and amortization expense:
Depreciation expense:	6,805	4,101	16,003	12,230
Amortization expense:	1,786	1,109	4,743	3,543
Ball Bonding Equipment
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	316	179	805	855
Depreciation and amortization expense:
Depreciation expense:	388	346	1,173	1,012
Amortization expense:	0	0	0	0
Wedge Bonding Equipment
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	83	358	403	780
Depreciation and amortization expense:
Depreciation expense:	304	252	878	732
Amortization expense:	0	0	0	0
Advanced Solutions
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	6,439	1,049	29,425	2,423
Depreciation and amortization expense:
Depreciation expense:	2,989	519	4,821	1,494
Amortization expense:	0	0	0	0
APS
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	1,251	1,151	4,443	2,851
Depreciation and amortization expense:
Depreciation expense:	1,517	1,681	4,742	4,971
Amortization expense:	380	208	1,116	684
All Others
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	30	437	279	700
Depreciation and amortization expense:
Depreciation expense:	416	250	1,017	792
Amortization expense:	1,314	809	3,352	2,584
Corporate Expenses
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	2,332	1,779	8,130	3,604
Depreciation and amortization expense:
Depreciation expense:	1,191	1,053	3,372	3,229
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://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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