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SEGMENT INFORMATION (Capital expenditures, depreciation and amortization expense by segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Mar. 30, 2019
Mar. 31, 2018
Mar. 30, 2019
Mar. 31, 2018
Capital expenditures:        
Capital expenditures $ 2,234 $ 6,153 $ 7,176 $ 12,410
Depreciation and amortization expense:        
Depreciation expense 3,368 2,722 6,260 5,247
Amortization expense 1,869 2,022 3,746 3,965
Capital Equipment [Member]        
Capital expenditures:        
Capital expenditures 1,288 2,044 3,472 3,879
Depreciation and amortization expense:        
Depreciation expense 2,002 1,887 3,740 3,675
Amortization expense 1,003 1,092 2,010 2,135
Aftermarket Products and Services (APS) [Member]        
Capital expenditures:        
Capital expenditures 946 4,109 3,704 8,531
Depreciation and amortization expense:        
Depreciation expense 1,366 835 2,520 1,572
Amortization expense $ 866 $ 930 $ 1,736 $ 1,830