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Inventory - Schedule of Impairment Charges Taken on Projects in Progress (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2026 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2026 USD ($) lot community | Jun. 30, 2025 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
# of Communities Impaired | community |  |  | 1 |
# of Lots Impaired | lot |  |  | 37 |
Impairment Charge | $ 0 | $ 8,642,000 | $ 1,295,000 | $ 8,642,000
Level 3 | Estimated Fair Value of Impaired Inventory at Time of Impairment |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Estimated Fair Value of Impaired Inventory at Time of Impairment | 5,597,000 |  | $ 5,597,000 |
Operating Segments | West |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
# of Communities Impaired | community |  |  | 1 |
# of Lots Impaired | lot |  |  | 37 |
Impairment Charge | 0 | 2,236,000 | $ 1,174,000 | 2,236,000
Operating Segments | West | Level 3 | Estimated Fair Value of Impaired Inventory at Time of Impairment |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Estimated Fair Value of Impaired Inventory at Time of Impairment | 5,072,000 |  | $ 5,072,000 |
Corporate and unallocated |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
# of Communities Impaired | community |  |  | 0 |
# of Lots Impaired | lot |  |  | 0 |
Impairment Charge | 0 | $ 1,002,000 | $ 121,000 | $ 1,002,000
Corporate and unallocated | Level 3 | Estimated Fair Value of Impaired Inventory at Time of Impairment |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Estimated Fair Value of Impaired Inventory at Time of Impairment | $ 525,000 |  | $ 525,000 |

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