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Derivative Instruments - Balance Sheet Presentation (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Derivative instruments
Interest rate swap agreements	$ 919	$ 2,631
Designated as Hedging Instrument
Derivative instruments
Fair value of derivative assets	140,297	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	140,297	149,755
Accounts payable | Gasoline and diesel fuel agreements | Not Designated as Hedging Instrument
Derivative instruments
Interest rate swap agreements	$ 919	$ 2,631

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- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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