The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Other Intangible Assets) (Narrative) (Details) - USD ($)	3 Months Ended	12 Months Ended
	Oct. 02, 2020	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Finite-Lived Intangible Assets [Line Items]
Impairment losses		$ 0	$ 0	$ 0
Amortization of patents and other intangible assets		2,334,000	$ 1,031,000	$ 1,111,000
Expected amortization in 2021	$ 419,000	419,000
Expected amortization in 2022	264,000	264,000
Expected amortization in 2023	264,000	264,000
Expected amortization in 2024	264,000	264,000
Expected amortization in 2025	264,000	$ 264,000
Impairment of underlying assets	0
Diving
Finite-Lived Intangible Assets [Line Items]
Impairment of long-lived assets	$ 0
Minimum
Finite-Lived Intangible Assets [Line Items]
Useful life (years)		4 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Useful life (years)		15 years