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Owned Inventory - Inventory Impairments and Lot Option Abandonment Charges, by Reportable Segment (Details) - USD ($) | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Real Estate, Write-down or Reserve [Line Items] |  |  |
Land held for sale | $ 0 | $ 1,868,000 | $ 0
Abandonments | 641,000 | 1,095,000 | 853,000
Total impairment and abandonment charges | 641,000 | 2,963,000 | 853,000
Corporate and unallocated |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Land held for sale | 0 | 565,000 | 0
West | Operating Segments |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Land held for sale | 0 | 1,303,000 | 0
Abandonments | 487,000 | 289,000 | 0
East | Operating Segments |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Abandonments | 154,000 | 143,000 | 465,000
Southeast | Operating Segments |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Abandonments | $ 0 | $ 663,000 | $ 388,000

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