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DERIVATIVE INSTRUMENTS AND HEDGING ACTIVITIES - Gains and losses recognized (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Derivative instruments and hedging activities    
Estimated unrealized net gains from cash flow hedges which are expected to be reclassified into earnings in the next twelve months $ 700  
Foreign currency forwards | Other income/(expense), net    
Derivative instruments and hedging activities    
Gains (losses) recognized in OCI (806) $ 1,165
Gains (losses) reclassified into earnings - Effective Portion 1,522 1,257
Gain (losses) recognized - Ineffective Portion and Amount excluded from effectiveness testing $ 100 $ 100