SEGMENT INFORMATION (Capital expenditures, depreciation and amortization expense by segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Segment Reporting, Other Significant Reconciling Item [Line Items]
Property, Plant and Equipment, Additions	$ 3,451	$ 2,136	$ 8,550	$ 9,312
Depreciation and amortization expense:
Depreciation expense	3,255	3,152	9,146	9,412
Amortization expense	1,814	1,843	5,451	5,589
Capital Equipment [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Property, Plant and Equipment, Additions	1,329	646	3,215	4,118
Depreciation and amortization expense:
Depreciation expense	1,713	1,800	4,747	5,540
Amortization expense	973	989	2,925	2,999
Aftermarket Products and Services (APS) [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Property, Plant and Equipment, Additions	2,122	1,490	5,335	5,194
Depreciation and amortization expense:
Depreciation expense	1,542	1,352	4,399	3,872
Amortization expense	$ 841	$ 854	$ 2,526	$ 2,590