REVENUE RECOGNITION - Schedule of Net Sales from Contracts with Customers by Market Sector (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 02, 2021	Jun. 26, 2020	Jul. 02, 2021	Jun. 26, 2020
Disaggregation of Revenue [Line Items]
Net sales	$ 49,370	$ 47,364	$ 142,211	$ 136,269
Aerospace & Defense
Disaggregation of Revenue [Line Items]
Net sales	37,521	27,945	98,126	81,761
Medical
Disaggregation of Revenue [Line Items]
Net sales	6,912	13,262	28,442	35,430
Industrial
Disaggregation of Revenue [Line Items]
Net sales	4,937	6,157	15,643	19,078
Point in Time
Disaggregation of Revenue [Line Items]
Net sales	20,288	24,356	66,101	68,676
Point in Time | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Net sales	11,177	14,263	35,880	40,639
Point in Time | Medical
Disaggregation of Revenue [Line Items]
Net sales	5,124	4,886	16,933	12,618
Point in Time | Industrial
Disaggregation of Revenue [Line Items]
Net sales	3,987	5,207	13,288	15,419
Over Time
Disaggregation of Revenue [Line Items]
Net sales	29,082	23,008	76,110	67,593
Over Time | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Net sales	26,344	13,682	62,246	41,122
Over Time | Medical
Disaggregation of Revenue [Line Items]
Net sales	1,788	8,376	11,509	22,812
Over Time | Industrial
Disaggregation of Revenue [Line Items]
Net sales	$ 950	$ 950	$ 2,355	$ 3,659