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Derivatives - Schedule of Losses on Derivatives (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
Derivative [Line Items] |  |  |
Loss recognized in AOCI on derivatives, net of tax | $ 2,222 | $ 2,742 | $ (8,427)
Amounts reclassified to earnings from accumulated other comprehensive loss | 508 |  |
Other comprehensive income/(losses) | 2,730 | 2,742 | (8,427)
Net unrealized loss on derivatives, net of tax |  |  |
Derivative [Line Items] |  |  |
Loss recognized in AOCI on derivatives, net of tax | (811) | 0 | 0
Amounts reclassified to earnings from accumulated other comprehensive loss | 508 | 0 | 0
Other comprehensive income/(losses) | $ (303) | $ 0 | $ 0

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