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SEGMENT INFORMATION (Capital expenditures and depreciation expense by segment) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 01, 2017
Apr. 02, 2016
Apr. 01, 2017
Apr. 02, 2016
Capital expenditures:        
Capital expenditures $ 15,877 $ 1,522 $ 18,106 $ 2,916
Depreciation expense:        
Depreciation expense 2,310 2,486 4,731 4,871
Equipment [Member]        
Capital expenditures:        
Capital expenditures 13,454 1,078 15,058 2,149
Depreciation expense:        
Depreciation expense 1,782 1,925 3,672 3,731
Expendable Tools [Member]        
Capital expenditures:        
Capital expenditures 2,423 444 3,048 767
Depreciation expense:        
Depreciation expense $ 528 $ 561 $ 1,059 $ 1,140