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SEGMENT INFORMATION (Capital expenditures and depreciation expense by segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2016
Jan. 02, 2016
Capital expenditures:    
Capital expenditures $ 2,229 $ 1,394
Depreciation expense:    
Depreciation expense 2,421 2,385
Equipment [Member]    
Capital expenditures:    
Capital expenditures 1,604 1,071
Depreciation expense:    
Depreciation expense 1,890 1,806
Expendable Tools [Member]    
Capital expenditures:    
Capital expenditures 625 323
Depreciation expense:    
Depreciation expense $ 531 $ 579