SEGMENT INFORMATION (Capital expenditures, depreciation and amortization expense by segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Segment Reporting, Other Significant Reconciling Item [Line Items]
Property, Plant and Equipment, Additions	$ 2,775	$ 2,234	$ 5,099	$ 7,176
Depreciation and amortization expense:
Depreciation expense	2,949	3,368	5,891	6,260
Amortization expense	1,820	1,869	3,637	3,746
Capital Equipment [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Property, Plant and Equipment, Additions	812	1,288	1,886	3,472
Depreciation and amortization expense:
Depreciation expense	1,491	2,002	3,034	3,740
Amortization expense	977	1,003	1,952	2,010
Aftermarket Products and Services (APS) [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Property, Plant and Equipment, Additions	1,963	946	3,213	3,704
Depreciation and amortization expense:
Depreciation expense	1,458	1,366	2,857	2,520
Amortization expense	$ 843	$ 866	$ 1,685	$ 1,736