GOODWILL AND INTANGIBLE ASSETS (Net intangible assets) (Details) - USD ($) $ in Thousands	9 Months Ended
	Jul. 03, 2021	Oct. 03, 2020
Schedule Of Intangible Assets [Line Items]
Net intangible assets	$ 45,031	$ 37,972
In Process Research and Development [Member]
Schedule Of Intangible Assets [Line Items]
Net intangible assets	9,000	0
Developed technology
Schedule Of Intangible Assets [Line Items]
Gross intangible assets	91,764	91,044
Accumulated amortization	(57,953)	(54,293)
Net intangible assets	33,811	36,751
Customer relationships
Schedule Of Intangible Assets [Line Items]
Gross intangible assets	36,507	36,307
Accumulated amortization	(36,507)	(35,587)
Net intangible assets	0	720
Trade and brand name
Schedule Of Intangible Assets [Line Items]
Gross intangible assets	7,439	7,404
Accumulated amortization	(7,236)	(6,903)
Net intangible assets	203	501
Other intangible assets
Schedule Of Intangible Assets [Line Items]
Gross intangible assets	4,700	2,500
Accumulated amortization	(2,683)	(2,500)
Net intangible assets	$ 2,017	$ 0
Minimum | Developed technology
Schedule Of Intangible Assets [Line Items]
Average estimated useful lives (in years)	7 years
Minimum | Customer relationships
Schedule Of Intangible Assets [Line Items]
Average estimated useful lives (in years)	5 years
Minimum | Trade and brand name
Schedule Of Intangible Assets [Line Items]
Average estimated useful lives (in years)	7 years
Minimum | Other intangible assets
Schedule Of Intangible Assets [Line Items]
Average estimated useful lives (in years)	1 year 10 months 24 days
Maximum | Developed technology
Schedule Of Intangible Assets [Line Items]
Average estimated useful lives (in years)	15 years
Maximum | Customer relationships
Schedule Of Intangible Assets [Line Items]
Average estimated useful lives (in years)	6 years
Maximum | Trade and brand name
Schedule Of Intangible Assets [Line Items]
Average estimated useful lives (in years)	8 years
Maximum | Other intangible assets
Schedule Of Intangible Assets [Line Items]
Average estimated useful lives (in years)	6 years