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DERIVATIVES FINANCIAL INSTRUMENTS (Fair value of derivative instruments) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2018
Sep. 30, 2017
Derivatives, Fair Value [Line Items]    
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimate of Time to Transfer 12 months  
Total derivative, Notional Amount $ 39,967 $ 36,404
Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]    
Derivatives, Fair Value [Line Items]    
Foreign exchange forward contract, term of contract 12 months  
Total derivative, Notional Amount $ 39,967 36,404
Prepaid Expenses And Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1],[2]   1,353
Derivative Liability, Fair Value, Gross Liability [1],[3] 1,044  
Prepaid Expenses And Other Current Assets [Member] | Designated as Hedging Instrument [Member] | Foreign Exchange Forward [Member]    
Derivatives, Fair Value [Line Items]    
Derivative Asset, Fair Value, Gross Asset [1],[2]   $ 1,353
Derivative Liability, Fair Value, Gross Liability [1],[3] $ 1,044  
[1] Hedged amounts expected to be recognized to income within the next twelve months.
[2] The fair value of derivative assets is measured using level 2 fair value inputs and is included in prepaid expenses and other current assets on our Consolidated Condensed Balance Sheet.
[3] The fair value of derivative liabilities is measured using level 2 fair value inputs and is included in accrued expenses and other current liabilities on our Consolidated Condensed Balance Sheet.