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Derivative Instruments and Hedging Activities (Details 3) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 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 $ 400   $ 400  
Foreign currency forwards        
Derivative instruments and hedging activities        
Gains (losses) recognized in OCI 30 $ (142) (1,417) $ 152
Gains (losses) reclassified into earnings - Effective Portion (607) $ 604 883 $ 1,336
Foreign currency forwards | Other income/(expense), net        
Derivative instruments and hedging activities        
Gain (losses) recognized - Ineffective Portion and Amount excluded from effectiveness testing $ 39   $ (121)