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SEGMENT INFORMATION (Capital expenditures, depreciation and amortization expense by segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Capital expenditures:    
Capital expenditures $ 6,257 $ 2,229
Depreciation and amortization expense:    
Depreciation expense 2,525 2,421
Amortization expense 1,943 1,523
Capital Equipment [Member]    
Capital expenditures:    
Capital expenditures 1,835 1,126
Depreciation and amortization expense:    
Depreciation expense 1,788 1,577
Amortization expense 1,043 594
Aftermarket Products and Services (APS) [Member]    
Capital expenditures:    
Capital expenditures 4,422 1,103
Depreciation and amortization expense:    
Depreciation expense 737 844
Amortization expense $ 900 $ 929