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GOODWILL AND INTANGIBLE ASSETS (Net intangible assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]    
Net intangible assets $ 52,871 $ 62,316
Developed technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross intangible assets 90,500 92,140
Accumulated amortization (45,229) (41,162)
Net intangible assets 45,271 50,978
Customer relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross intangible assets 36,131 36,968
Accumulated amortization (29,820) (27,398)
Net intangible assets 6,311 9,570
Trade name [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross intangible assets 7,377 7,515
Accumulated amortization (6,088) (5,747)
Net intangible assets 1,289 1,768
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