REVENUE RECOGNITION - Schedule of Net Sales from Contracts with Customers by Market Sector (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Disaggregation of Revenue [Line Items]
Net sales	$ 40,324	$ 29,782	$ 113,059	$ 82,706
Aerospace & Defense
Disaggregation of Revenue [Line Items]
Net sales	24,598		66,705
Medical
Disaggregation of Revenue [Line Items]
Net sales	8,871		24,873
Industrial
Disaggregation of Revenue [Line Items]
Net sales	6,855		21,481
Point in Time
Disaggregation of Revenue [Line Items]
Net sales	21,084		57,454
Point in Time | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Net sales	11,300		30,950
Point in Time | Medical
Disaggregation of Revenue [Line Items]
Net sales	5,127		12,441
Point in Time | Industrial
Disaggregation of Revenue [Line Items]
Net sales	4,657		14,063
Over Time
Disaggregation of Revenue [Line Items]
Net sales	19,240		55,605
Over Time | Aerospace & Defense
Disaggregation of Revenue [Line Items]
Net sales	13,298		35,755
Over Time | Medical
Disaggregation of Revenue [Line Items]
Net sales	3,744		12,432
Over Time | Industrial
Disaggregation of Revenue [Line Items]
Net sales	$ 2,198		$ 7,418