LEASES - Components of Operating Lease Expense and Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jul. 02, 2021	Jun. 26, 2020	Jul. 02, 2021	Jun. 26, 2020
Lessee, Lease, Description [Line Items]
Interest	$ 250	$ 87	$ 718	$ 261
Total lease expense	877	281	2,376	851
Cash paid for operating lease ROU assets			55	65
Interest paid on finance leases			718	261
Lease liabilities arising from obtaining ROU assets: Operating leases				33
Lease liabilities arising from obtaining ROU assets: Finance leases			19,142
Cost of sales
Lessee, Lease, Description [Line Items]
Operating lease expense	31	62	161	155
Finance lease expense	557	131	1,383	404
Selling and administrative expenses
Lessee, Lease, Description [Line Items]
Operating lease expense	6	1	25	31
Finance lease expense	$ 33	$ 0	$ 89	$ 0