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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
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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 |  |  |

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