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Fair Value Measurements and Derivative Instruments - Additional Information (Details) gal in Millions, $ in Millions | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2024 USD ($) gal | Sep. 30, 2023 USD ($) | Aug. 28, 2023 USD ($) | Jan. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Interest Rate Contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | $ 600.0 | $ 600.0 |  |  |
Interest Rate Swaps |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount |  |  |  | $ 500.0 | $ 500.0
Net deferred gain on interest rate swap net of taxes expected to be recognized over the next 12 months | $ 6.1 |  |  |  |
Interest Rate Collar Agreement |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount |  |  |  | $ 500.0 |
Terminated notional amount |  |  | $ 400.0 |  |
Fuel Swap Contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional volume | gal | 4.0 |  |  |  |
Maximum |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Percentage of participants compensation deferred | 70.00% |  |  |  |

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