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Derivative Instruments and Hedging Activities - Gains and losses recognized (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Derivative instruments and hedging activities        
Gains (losses) recognized in OCI $ 10,312 $ 1,438 $ 10,371 $ (177)
Gains (losses) reclassified into earnings 295 1,306 550 1,273
Estimated unrealized net gains from cash flow hedges which are expected to be reclassified into earnings in the next twelve months 3,000   3,000  
Foreign currency forwards        
Derivative instruments and hedging activities        
Gains (losses) recognized in OCI 434 1,438 (665) (177)
Gains (losses) reclassified into earnings 295 1,306 550 1,273
Realized gain (losses) on derivative 200 $ 2,700   $ 2,800
Interest Rate Swaps        
Derivative instruments and hedging activities        
Gains (losses) recognized in OCI $ 9,878   $ 11,036