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Owned Inventory - Schedule of Inventory Impairments and Abandonment Charges, by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Real Estate Properties [Line Items] |  |  |  |
Total impairment charges on projects in progress | $ 8,642 | $ 0 | $ 8,642 | $ 0
Total impairment charges on land held for sale | 1,466 | 0 | 1,466 | 0
Total abandonments charges | 231 | 200 | 759 | 200
Inventory impairments and abandonments | 10,339 | 200 | 10,867 | 200
Corporate and unallocated |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Total impairment charges on projects in progress | 1,002 | 0 | 1,002 | 0
Total impairment charges on land held for sale | 621 | 0 | 621 | 0
West | Operating Segments |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Total impairment charges on projects in progress | 2,236 | 0 | 2,236 | 0
Total impairment charges on land held for sale | 845 | 0 | 845 | 0
Total abandonments charges | 0 | 9 | 528 | 9
East | Operating Segments |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Total abandonments charges | 0 | 91 | 0 | 91
Southeast | Operating Segments |  |  |  |
Real Estate Properties [Line Items] |  |  |  |
Total impairment charges on projects in progress | 5,404 | 0 | 5,404 | 0
Total abandonments charges | $ 231 | $ 100 | $ 231 | $ 100

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