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Owned Inventory - Impairment Charges Taken on Land Held for Sale (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 USD ($) lot community | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) lot | Jun. 30, 2024 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
# of Communities Impaired | community | 1 |  |  |
# of Lots Impaired | lot | 38 |  | 38 |
Impairment Charge | $ 1,466 | $ 0 | $ 1,466 | $ 0
Level 3 | Fair Value, Measurements, Nonrecurring |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Estimated Fair Value Less Cost to Sell of Impaired Inventory at Time of Impairment | $ 3,686 |  | 3,686 |
Operating Segments | West |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
# of Communities Impaired | community | 1 |  |  |
# of Lots Impaired | lot | 38 |  |  |
Impairment Charge | $ 845 | 0 | 845 | 0
Operating Segments | West | Level 3 | Fair Value, Measurements, Nonrecurring |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Estimated Fair Value Less Cost to Sell of Impaired Inventory at Time of Impairment | $ 3,686 |  | 3,686 |
Corporate and unallocated |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
# of Communities Impaired | community | 0 |  |  |
# of Lots Impaired | lot | 0 |  |  |
Impairment Charge | $ 621 | $ 0 | 621 | $ 0
Corporate and unallocated | Level 3 | Fair Value, Measurements, Nonrecurring |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Estimated Fair Value Less Cost to Sell of Impaired Inventory at Time of Impairment | $ 0 |  | $ 0 |

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