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SEGMENT INFORMATION (Capital expenditures, depreciation and amortization expense by segment) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jul. 01, 2017
Jul. 02, 2016
Jul. 01, 2017
Jul. 02, 2016
Capital expenditures:        
Capital expenditures $ 3,803 $ 1,480 $ 21,909 $ 4,396
Depreciation and amortization expense:        
Depreciation expense 2,442 2,354 7,173 7,225
Amortization expense 1,521 1,665 4,566 4,996
Equipment [Member]        
Capital expenditures:        
Capital expenditures 1,476 988 16,534 3,137
Depreciation and amortization expense:        
Depreciation expense 1,891 1,800 5,563 5,531
Amortization expense 1,521 1,665 4,566 4,996
Expendable Tools [Member]        
Capital expenditures:        
Capital expenditures 2,327 492 5,375 1,259
Depreciation and amortization expense:        
Depreciation expense 551 554 1,610 1,694
Amortization expense $ 0 $ 0 $ 0 $ 0