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Derivative and Hedging Instruments - Effect of the Interest Rate Swap Agreements (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Results Recognized in Accumulated Other Comprehensive Income (Loss) (effective Portion) | $ (1,188) | $ 0 | $ 4,463 | $ 0
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) to earnings | 814 | 0 | 2,952 | 0
Floorplan Interest Expense |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) to earnings | 406 | 0 | 1,557 | 0
Interest Expense |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |
Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) to earnings | $ 408 | $ 0 | $ 1,395 | $ 0

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