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Basis of Presentation and Summary of Significant Accounting Policies - Revenue Recognition (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024 | Sep. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenue | $ 565,339 | $ 541,540 | $ 1,034,292 | $ 928,358 |
Customer deposits | 21,109 |  | 21,109 |  | $ 18,669
Contract with customer, liability, revenue recognized | 5,600 |  | 13,800 |  |
Homebuilding revenue |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenue | 556,032 | 538,636 | 1,016,454 | 919,555 |
Land sales and other revenue |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Total revenue | $ 9,307 | $ 2,904 | $ 17,838 | $ 8,803 |

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