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Derivative Instruments - Statement Of Financial Position (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Derivative [Line Items]            
Derivative asset, net, gross fair value $ (47,154)   $ 21,921      
Derivative assets, net, net fair value (47,154) $ (19,470) 21,921 $ 31,797 $ 60,671 $ 14,959
Current derivative assets            
Derivative [Line Items]            
Derivative asset, gross fair value 533   19,690      
Derivative asset, amounts netted (307)   (871)      
Derivative assets, net fair value 226   18,819      
Non-current derivative assets            
Derivative [Line Items]            
Derivative asset, gross fair value 402   4,651      
Derivative asset, amounts netted (295)   (1,549)      
Derivative assets, net fair value 107   3,102      
Current derivative liabilities            
Derivative [Line Items]            
Derivative liability, gross fair value (36,558)   (871)      
Derivative liability, amounts netted 307   871      
Derivative liability, net fair value (36,251)   0      
Non-current derivative liabilities            
Derivative [Line Items]            
Derivative liability, gross fair value (11,531)   (1,549)      
Derivative liability, amounts netted 295   1,549      
Derivative liability, net fair value $ (11,236)   $ 0