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SEGMENT INFORMATION (Capital expenditures, depreciation and amortization expense by segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jun. 29, 2019
Jun. 30, 2018
Jun. 29, 2019
Jun. 30, 2018
Capital expenditures:        
Capital expenditures $ 2,136 $ 4,071 $ 9,312 $ 16,481
Depreciation and amortization expense:        
Depreciation expense 3,152 2,989 9,412 8,236
Amortization expense 1,843 1,962 5,589 5,927
Capital Equipment [Member]        
Capital expenditures:        
Capital expenditures 646 999 4,118 4,878
Depreciation and amortization expense:        
Depreciation expense 1,800 1,926 5,540 5,601
Amortization expense 989 1,053 2,999 3,188
Aftermarket Products and Services (APS) [Member]        
Capital expenditures:        
Capital expenditures 1,490 3,072 5,194 11,603
Depreciation and amortization expense:        
Depreciation expense 1,352 1,063 3,872 2,635
Amortization expense $ 854 $ 909 $ 2,590 $ 2,739