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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. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Capital expenditures:        
Capital expenditures $ 4,071 $ 3,803 $ 16,481 $ 21,909
Depreciation and amortization expense:        
Depreciation expense 2,989 2,442 8,236 7,173
Amortization expense 1,962 1,521 5,927 4,566
Capital Equipment [Member]        
Capital expenditures:        
Capital expenditures 999 1,423 4,878 12,907
Depreciation and amortization expense:        
Depreciation expense 1,926 1,599 5,601 4,660
Amortization expense 1,053 594 3,188 1,782
Aftermarket Products and Services (APS) [Member]        
Capital expenditures:        
Capital expenditures 3,072 2,380 11,603 9,002
Depreciation and amortization expense:        
Depreciation expense 1,063 843 2,635 2,513
Amortization expense $ 909 $ 927 $ 2,739 $ 2,784