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Derivative Instruments and Hedging Activities - Gains and losses recognized (Details) - USD ($)
$ in Thousands
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Derivative instruments and hedging activities    
Gains (losses) recognized in OCI $ 59 $ (1,583)
Gains (losses) reclassified into earnings - Effective Portion 255 (66)
Estimated unrealized net gains (losses) from cash flow hedges which are expected to be reclassified into earnings in the next twelve months 3,300  
Foreign currency forwards    
Derivative instruments and hedging activities    
Gains (losses) recognized in OCI (1,100) (1,583)
Gains (losses) reclassified into earnings - Effective Portion 255 $ (66)
Realized gain (loss) on derivative 200  
Interest Rate Swaps    
Derivative instruments and hedging activities    
Gains (losses) recognized in OCI $ 1,159