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GOODWILL AND INTANGIBLE ASSETS (Net intangible assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Oct. 03, 2020
Sep. 28, 2019
Finite-Lived Intangible Assets [Line Items]    
Net intangible assets $ 37,972 $ 42,651
Developed technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross intangible assets 91,044 87,209
Accumulated amortization (54,293) (48,718)
Net intangible assets 36,751 38,491
Customer relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross intangible assets 36,307 35,180
Accumulated amortization (35,587) (31,862)
Net intangible assets 720 3,318
Trade name [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross intangible assets 7,404 7,219
Accumulated amortization (6,903) (6,377)
Net intangible assets 501 842
Other intangible assets [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross intangible assets 2,500 2,500
Accumulated amortization (2,500) (2,500)
Net intangible assets $ 0 $ 0
Average estimated useful lives (in years) 1 year 10 months 24 days  
Minimum [Member] | Developed technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 7 years  
Minimum [Member] | Customer relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 5 years  
Minimum [Member] | Trade name [Member]    
Finite-Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 7 years  
Maximum [Member] | Developed technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 15 years  
Maximum [Member] | Customer relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 6 years  
Maximum [Member] | Trade name [Member]    
Finite-Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 8 years