Derivative and Hedging Instruments - Effect of the Interest Rate Swap Agreements (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Derivative Instruments and Hedging Activities Disclosures [Line Items] | ||||
| Results Recognized in Accumulated Other Comprehensive Income (Loss) (effective Portion) | $ (2,922) | $ 0 | $ 5,651 | $ 0 |
| Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) to earnings | 854 | 0 | 2,138 | 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 | 435 | 0 | 1,151 | 0 |
| Interest Expense | ||||
| Derivative Instruments and Hedging Activities Disclosures [Line Items] | ||||
| Amount of gain (loss) reclassified from accumulated other comprehensive income (loss) to earnings | $ 419 | $ 0 | $ 987 | $ 0 |