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Derivative Instruments and Hedging Activities - Gains and losses recognized (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Derivative instruments and hedging activities    
Gains (losses) recognized in OCI $ (16,150) $ 4,344
Gains (losses) reclassified into earnings - Effective Portion 3,695 1,945
Estimated unrealized net gains (losses) from cash flow hedges which are expected to be reclassified into earnings in the next twelve months 2,300  
Foreign currency forwards    
Derivative instruments and hedging activities    
Gains (losses) recognized in OCI (2,706) 4,104
Gains (losses) reclassified into earnings - Effective Portion 3,695 1,945
Realized gain (loss) on derivative 5,500  
Forward starting swap    
Derivative instruments and hedging activities    
Gains (losses) recognized in OCI $ (13,444) $ 240