MARKET SECTORS AND MAJOR CUSTOMERS - Narrative (Details) - Customer Concentration Risk - customer	3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 02, 2021	Jun. 26, 2020	Jul. 02, 2021	Jun. 26, 2020	Sep. 30, 2020
Sales
Concentration Risk [Line Items]
Concentration risk, number of customers	4	4	4	4
Sales | Aerospace & Defense
Concentration Risk [Line Items]
Concentration risk, number of customers	4	3		3
Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, number of customers			3		2
Customer Number One | Sales | Aerospace & Defense
Concentration Risk [Line Items]
Concentration risk, percentage	20.00%	27.00%	23.00%	26.00%
Customer Number Two | Sales | Aerospace & Defense
Concentration Risk [Line Items]
Concentration risk, percentage	19.00%	11.00%	13.00%	11.00%
Customer Number Two | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage					30.00%
Customer Number Three | Sales | Aerospace & Defense
Concentration Risk [Line Items]
Concentration risk, percentage	15.00%	10.00%	12.00%	10.00%
Customer Number Three | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk, percentage			53.00%
Customer Number Four | Sales | Aerospace & Defense
Concentration Risk [Line Items]
Concentration risk, percentage	12.00%		12.00%
Customer Number Four | Sales | Medical
Concentration Risk [Line Items]
Concentration risk, percentage		17.00%		16.00%