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SEGMENT INFORMATION (Capital expenditures, depreciation and amortization expense by segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Capital expenditures:    
Capital expenditures $ 4,942 $ 6,257
Depreciation and amortization expense:    
Depreciation expense 2,892 2,525
Amortization expense 1,877 1,943
Capital Equipment [Member]    
Capital expenditures:    
Capital expenditures 2,184 1,835
Depreciation and amortization expense:    
Depreciation expense 1,738 1,788
Amortization expense 1,007 1,043
Aftermarket Products and Services (APS) [Member]    
Capital expenditures:    
Capital expenditures 2,758 4,422
Depreciation and amortization expense:    
Depreciation expense 1,154 737
Amortization expense $ 870 $ 900