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GOODWILL AND INTANGIBLE ASSETS (Net intangible assets) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Apr. 01, 2017
Oct. 01, 2016
Finite-Lived Intangible Assets [Line Items]    
Net intangible assets $ 47,766 $ 50,810
Developed technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross intangible assets 74,080 74,080
Accumulated amortization (39,332) (37,969)
Net intangible assets 34,748 36,111
Customer relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross intangible assets 36,968 36,968
Accumulated amortization (25,925) (24,455)
Net intangible assets 11,043 12,513
Trade name [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross intangible assets 7,515 7,515
Accumulated amortization (5,540) (5,329)
Net intangible assets 1,975 2,186
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