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Owned Inventory - Schedule of Inventory Impairments and Abandonment Charges, by Reportable Segment (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Real Estate, Write-down or Reserve [Line Items] |  |  |
Total impairment charges on projects in progress | $ 8,642 | $ 0 | $ 0
Total impairment charges on land held for sale | 2,733 | 0 | 0
Total abandonments charges | 1,584 | 1,996 | 641
Total impairment and abandonment charges | 12,959 | 1,996 | 641
Corporate and unallocated |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Total impairment charges on projects in progress | 1,002 | 0 | 0
Total impairment charges on land held for sale | 1,238 | 0 | 0
West | Operating Segments |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Total impairment charges on projects in progress | 2,236 | 0 | 0
Total impairment charges on land held for sale | 1,495 | 0 | 0
Total abandonments charges | 921 | 1,805 | 487
East | Operating Segments |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Total abandonments charges | 215 | 91 | 154
Southeast | Operating Segments |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Total impairment charges on projects in progress | 5,404 | 0 | 0
Total abandonments charges | $ 448 | $ 100 | $ 0

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