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SEGMENT INFORMATION (Capital expenditures, depreciation, and amortization expense by segment) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Oct. 01, 2016
Capital expenditures:      
Capital expenditures $ 20,441 $ 25,688 $ 6,301
Depreciation expense:      
Depreciation expense 11,189 9,703 9,569
Amortization expense:      
Amortization expense 7,826 6,554 6,661
Capital Equipment      
Capital expenditures:      
Capital expenditures 7,029 14,415 3,111
Depreciation expense:      
Depreciation expense 7,435 6,306 6,012
Amortization expense:      
Amortization expense 4,203 2,841 2,760
APS [Member]      
Capital expenditures:      
Capital expenditures 13,412 11,273 3,190
Depreciation expense:      
Depreciation expense 3,754 3,397 3,557
Amortization expense:      
Amortization expense $ 3,623 $ 3,713 $ 3,901