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GOODWILL AND INTANGIBLE ASSETS (Net intangible assets) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2018
Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]    
Net intangible assets $ 60,180 $ 62,316
Developed technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross intangible assets 94,031 92,140
Accumulated amortization (43,622) (41,162)
Net intangible assets 50,409 50,978
Customer relationships [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross intangible assets 37,173 36,968
Accumulated amortization (28,982) (27,398)
Net intangible assets 8,191 9,570
Trade name [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross intangible assets 7,549 7,515
Accumulated amortization (5,969) (5,747)
Net intangible assets 1,580 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