SEGMENT INFORMATION (Capital expenditures, depreciation, and amortization expense by segment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Oct. 01, 2016	Oct. 03, 2015
Capital expenditures:
Capital expenditures	$ 25,688	$ 6,301	$ 9,519
Depreciation expense:
Depreciation expense	9,703	9,569	9,089
Amortization expense:
Amortization expense	6,554	6,661	9,883
Capital Equipment
Capital expenditures:
Capital expenditures	14,415	3,111	6,592
Depreciation expense:
Depreciation expense	6,306	6,012	6,075
Amortization expense:
Amortization expense	2,841	2,760	4,291
APS [Member]
Capital expenditures:
Capital expenditures	11,273	3,190	2,927
Depreciation expense:
Depreciation expense	3,397	3,557	3,014
Amortization expense:
Amortization expense	$ 3,713	$ 3,901	$ 5,592