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Derivative Instruments - Balance Sheet Presentation (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Sep. 30, 2022
--- | --- | ---
Derivative instruments |  |
Interest rate swap agreements | $ 1,888 | $ 2,631
Designated as Hedging Instrument |  |
Derivative instruments |  |
Fair value of derivative assets | 116,472 | 155,033
Prepayments and other current assets | Interest rate swap agreements | Designated as Hedging Instrument |  |
Derivative instruments |  |
Fair value of derivative assets | 0 | 5,278
Other Assets | Interest rate swap agreements | Designated as Hedging Instrument |  |
Derivative instruments |  |
Fair value of derivative assets | 116,472 | 149,755
Accounts payable | Gasoline and diesel fuel agreements | Not Designated as Hedging Instrument |  |
Derivative instruments |  |
Interest rate swap agreements | $ 1,888 | $ 2,631

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