SEGMENT INFORMATION (Capital expenditures, depreciation and amortization expense by segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 28, 2025	Jun. 29, 2024	Jun. 28, 2025	Jun. 29, 2024
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	$ 2,733	$ 3,266	$ 7,560	$ 10,645
Depreciation and amortization expense:
Depreciation expense:	3,609	3,694	11,216	15,974
Amortization expense:	308	1,250	2,725	3,922
Ball Bonding Equipment
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	19	172	76	726
Depreciation and amortization expense:
Depreciation expense:	321	363	985	1,010
Amortization expense:	0	0	0	0
Wedge Bonding Equipment
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	211	495	291	630
Depreciation and amortization expense:
Depreciation expense:	219	228	674	764
Amortization expense:	0	0	0	0
Advanced Solutions
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	32	47	124	365
Depreciation and amortization expense:
Depreciation expense:	277	295	793	5,663
Amortization expense:	0	0	0	0
APS
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	441	157	1,234	827
Depreciation and amortization expense:
Depreciation expense:	1,209	1,332	3,921	3,957
Amortization expense:	0	227	526	684
All others
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	390	412	777	839
Depreciation and amortization expense:
Depreciation expense:	255	398	925	1,164
Amortization expense:	216	931	1,924	2,963
Corporate Expenses
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditures:	1,640	1,983	5,058	7,258
Depreciation and amortization expense:
Depreciation expense:	1,328	1,078	3,918	3,416
Amortization expense:	$ 92	$ 92	$ 275	$ 275