SEGMENT INFORMATION (Operating information by segment) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 27, 2020	Jun. 29, 2019	Jun. 27, 2020	Jun. 29, 2019
Net revenue:
Revenues	$ 150,450	$ 127,109	$ 445,488	$ 400,225
Income from operations:
Income from operations	10,971	1,827	35,461	13,917
Capital Equipment [Member]
Net revenue:
Revenues	111,436	89,860	326,982	286,364
Income from operations:
Income from operations	1,045	(6,449)	7,815	(10,563)
Aftermarket Products and Services (APS) [Member]
Net revenue:
Revenues	39,014	37,249	118,506	113,861
Income from operations:
Income from operations	$ 9,926	$ 8,276	$ 27,646	$ 24,480