REVENUE RECOGNITION - IMPACT OF ADOPTION OF ASC 606 (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 26, 2020	Mar. 27, 2020	Dec. 27, 2019	Sep. 30, 2019	Jun. 28, 2019	Mar. 29, 2019	Dec. 28, 2018	Sep. 30, 2020	Sep. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Inventory, Net	$ 51,374				$ 44,267				$ 51,374	$ 44,267
Retained Earnings (Accumulated Deficit)	(8,522)				(15,275)				(8,522)	(15,275)
Revenue from Contract with Customer, Excluding Assessed Tax									182,714	156,981
Cost of Goods and Services Sold									158,594	135,337
Gross Profit	6,737	$ 6,642	$ 5,503	$ 5,239	6,394	$ 5,605	$ 4,586	$ 5,059	24,120	21,644
Provision for income taxes									1,943	1,176
Net Income (Loss) Attributable to Parent	$ 1,927	$ 2,114	$ 1,523	$ 1,189	$ 1,794	$ 1,211	$ 670	$ 1,072	6,753	4,747
Accumulated Deficit
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net Income (Loss) Attributable to Parent									$ 6,753	$ 4,747