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Owned Inventory - Impairment Charges Taken on Land Held for Sale (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 USD ($) lot community | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($)
Inventory [Line Items] |  |  |
# of Communities Impaired | community | 4 |  |
# of Lots Impaired | lot | 131 |  |
Impairment Charge | $ 2,733 | $ 0 | $ 0
Level 3 | Fair Value, Measurements, Nonrecurring |  |  |
Inventory [Line Items] |  |  |
Estimated Fair Value Less Cost to Sell of Impaired Inventory at Time of Impairment | $ 11,240 |  |
Operating Segments | West |  |  |
Inventory [Line Items] |  |  |
# of Communities Impaired | community | 4 |  |
# of Lots Impaired | lot | 131 |  |
Impairment Charge | $ 1,495 | 0 | 0
Operating Segments | West | Level 3 | Fair Value, Measurements, Nonrecurring |  |  |
Inventory [Line Items] |  |  |
Estimated Fair Value Less Cost to Sell of Impaired Inventory at Time of Impairment | $ 11,240 |  |
Corporate and unallocated |  |  |
Inventory [Line Items] |  |  |
# of Communities Impaired | community | 0 |  |
# of Lots Impaired | lot | 0 |  |
Impairment Charge | $ 1,238 | $ 0 | $ 0
Corporate and unallocated | Level 3 | Fair Value, Measurements, Nonrecurring |  |  |
Inventory [Line Items] |  |  |
Estimated Fair Value Less Cost to Sell of Impaired Inventory at Time of Impairment | $ 0 |  |

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