SEGMENT INFORMATION (Operating information by segment) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 28, 2020	Mar. 30, 2019	Mar. 28, 2020	Mar. 30, 2019
Net revenue:
Revenues	$ 150,741	$ 115,908	$ 295,038	$ 273,116
Income from operations:
Income from operations	11,076	(2,465)	24,490	12,090
Capital Equipment [Member]
Net revenue:
Revenues	113,222	80,567	215,546	196,505
Income from operations:
Income from operations	4,062	(9,244)	6,770	(4,114)
Aftermarket Products and Services (APS) [Member]
Net revenue:
Revenues	37,519	35,341	79,492	76,611
Income from operations:
Income from operations	$ 7,014	$ 6,779	$ 17,720	$ 16,204