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Derivative Instruments and Hedging Activities - Gains and losses recognized (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Derivative instruments and hedging activities    
Estimated unrealized net gains (losses) from cash flow hedges which are expected to be reclassified into earnings in the next twelve months $ 600  
Foreign currency forwards | Other income/(expense), net    
Derivative instruments and hedging activities    
Gains (losses) recognized in OCI (2,200) $ (806)
Gains (losses) reclassified into earnings - Effective Portion 551 1,522
Gain (losses) recognized - Ineffective Portion and Amount excluded from effectiveness testing $ 100 $ 100