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Derivative Instruments and Hedging Activities - Gains and losses recognized (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 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   $ 700  
Foreign currency forwards        
Derivative instruments and hedging activities        
Gains (losses) recognized in OCI 500 $ (534) 917 $ (382)
Gains (losses) reclassified into earnings - Effective Portion 453 $ (156) 1,336 $ 1,180
Foreign currency forwards | Other income/(expense), net        
Derivative instruments and hedging activities        
Gain (losses) recognized - Ineffective Portion and Amount excluded from effectiveness testing $ (5)   $ (126)