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GOODWILL AND INTANGIBLE ASSETS (Net intangible assets) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Jan. 02, 2021
Oct. 03, 2020
Finite-Lived Intangible Assets [Line Items]    
Net intangible assets $ 37,577 $ 37,972
Developed technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross intangible assets 93,503 91,044
Accumulated amortization (56,356) (54,293)
Net intangible assets 37,147 36,751
Customer relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross intangible assets 37,030 36,307
Accumulated amortization (37,018) (35,587)
Net intangible assets 12 720
Trade name [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross intangible assets 7,523 7,404
Accumulated amortization (7,105) (6,903)
Net intangible assets 418 501
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 | Developed technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 7 years  
Minimum | Customer relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 5 years  
Minimum | Trade name [Member]    
Finite-Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 7 years  
Maximum | Developed technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 15 years  
Maximum | Customer relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 6 years  
Maximum | Trade name [Member]    
Finite-Lived Intangible Assets [Line Items]    
Average estimated useful lives (in years) 8 years