SEGMENT INFORMATION (Capital expenditures, depreciation and amortization expense by segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Apr. 04, 2026	Mar. 29, 2025	Apr. 04, 2026	Mar. 29, 2025
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	$ 3,679	$ 2,716	$ 5,748	$ 4,827
Depreciation and amortization expense:
Depreciation expense:	3,671	3,840	7,322	7,607
Amortization expense:	307	1,171	615	2,417
Ball Bonding Equipment
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	63	50	98	57
Depreciation and amortization expense:
Depreciation expense:	264	332	539	664
Amortization expense:	0	0	0	0
Wedge Bonding Equipment
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	437	45	513	80
Depreciation and amortization expense:
Depreciation expense:	248	228	475	455
Amortization expense:	0	0	0	0
Advanced Solutions
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	0	14	0	92
Depreciation and amortization expense:
Depreciation expense:	257	281	518	516
Amortization expense:	0	0	0	0
APS
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	233	258	982	565
Depreciation and amortization expense:
Depreciation expense:	1,175	1,308	2,374	2,706
Amortization expense:	0	0	0	0
All Others
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	40	390	45	615
Depreciation and amortization expense:
Depreciation expense:	322	347	604	676
Amortization expense:	216	1,080	432	2,234
Corporate Expenses
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	2,906	1,959	4,110	3,418
Depreciation and amortization expense:
Depreciation expense:	1,405	1,344	2,812	2,590
Amortization expense:	$ 91	$ 91	$ 183	$ 183