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Derivative Instruments - Statement Of Financial Position (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Sep. 30, 2021
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Derivative [Line Items] |  |
Derivative asset, net, gross fair value | $ (57,986) | $ (50,970)
Derivative assets, net, net fair value | (57,986) | (50,970)
Current derivative assets |  |
Derivative [Line Items] |  |
Derivative asset, gross fair value | 1,161 | 186
Derivative asset, amounts netted | (27) | (186)
Derivative assets, net fair value | 1,134 | 0
Non-current derivative assets |  |
Derivative [Line Items] |  |
Derivative asset, gross fair value | 313 | 228
Derivative asset, amounts netted | (13) | (122)
Derivative assets, net fair value | 300 | 106
Current derivative liabilities |  |
Derivative [Line Items] |  |
Derivative liability, gross fair value | (50,325) | (42,330)
Derivative liability, amounts netted | 27 | 186
Derivative liability, net fair value | (50,298) | (42,144)
Non-current derivative liabilities |  |
Derivative [Line Items] |  |
Derivative liability, gross fair value | (9,135) | (9,054)
Derivative liability, amounts netted | 13 | 122
Derivative liability, net fair value | $ (9,122) | $ (8,932)

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