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GOODWILL AND INTANGIBLE ASSETS (Net intangible assets) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Apr. 02, 2022
Oct. 02, 2021
Schedule Of Intangible Assets [Line Items]    
Net intangible assets $ 38,440 $ 42,752
In-process research and development    
Schedule Of Intangible Assets [Line Items]    
Gross intangible assets 8,380 8,795
Accumulated amortization 0 0
Net intangible assets 8,380 8,795
Developed technology    
Schedule Of Intangible Assets [Line Items]    
Gross intangible assets 87,728 90,427
Accumulated amortization (59,410) (58,494)
Net intangible assets $ 28,318 31,933
Developed technology | Minimum    
Schedule Of Intangible Assets [Line Items]    
Estimated useful life 7 years  
Developed technology | Maximum    
Schedule Of Intangible Assets [Line Items]    
Estimated useful life 15 years  
Customer relationships    
Schedule Of Intangible Assets [Line Items]    
Gross intangible assets $ 35,321 36,114
Accumulated amortization (35,321) (36,114)
Net intangible assets $ 0 0
Customer relationships | Minimum    
Schedule Of Intangible Assets [Line Items]    
Estimated useful life 5 years  
Customer relationships | Maximum    
Schedule Of Intangible Assets [Line Items]    
Estimated useful life 6 years  
Trade and brand name    
Schedule Of Intangible Assets [Line Items]    
Gross intangible assets $ 7,243 7,374
Accumulated amortization (7,243) (7,275)
Net intangible assets $ 0 99
Trade and brand name | Minimum    
Schedule Of Intangible Assets [Line Items]    
Estimated useful life 7 years  
Trade and brand name | Maximum    
Schedule Of Intangible Assets [Line Items]    
Estimated useful life 8 years  
Other intangible assets    
Schedule Of Intangible Assets [Line Items]    
Gross intangible assets $ 4,700 4,700
Accumulated amortization (2,958) (2,775)
Net intangible assets $ 1,742 $ 1,925
Other intangible assets | Minimum    
Schedule Of Intangible Assets [Line Items]    
Estimated useful life 1 year 10 months 24 days  
Other intangible assets | Maximum    
Schedule Of Intangible Assets [Line Items]    
Estimated useful life 6 years