REVENUE RECOGNITION - Schedule of Net Sales from Contracts with Customers by Market Sector (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 27, 2020	Mar. 29, 2019	Mar. 27, 2020	Mar. 29, 2019
Disaggregation of Revenue [Line Items]
Net sales	$ 44,171	$ 37,294	$ 88,905	$ 72,735
Aerospace & Defense
Disaggregation of Revenue [Line Items]
Net sales	26,503	23,122	54,232	41,459
Medical
Disaggregation of Revenue [Line Items]
Net sales	10,601	7,086	21,337	16,729
Industrial
Disaggregation of Revenue [Line Items]
Net sales	7,067	7,086	13,336	14,547
Point in Time
Disaggregation of Revenue [Line Items]
Net sales	20,917	19,530	44,321	36,360
Point in Time | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Net sales	12,336	11,075	26,792	19,002
Point in Time | Medical
Disaggregation of Revenue [Line Items]
Net sales	3,151	3,872	6,901	8,040
Point in Time | Industrial
Disaggregation of Revenue [Line Items]
Net sales	5,430	4,583	10,628	9,318
Over Time
Disaggregation of Revenue [Line Items]
Net sales	23,254	17,764	44,584	36,375
Over Time | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Net sales	14,167	12,047	27,440	22,457
Over Time | Medical
Disaggregation of Revenue [Line Items]
Net sales	7,450	3,214	14,436	8,689
Over Time | Industrial
Disaggregation of Revenue [Line Items]
Net sales	$ 1,637	$ 2,503	$ 2,708	$ 5,229