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Owned Inventory - Inventory Impairments and Lot Option Abandonment Charges, by Reportable Segment (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Real Estate, Write-down or Reserve [Line Items] |  |  |
Land held for sale | $ 1,900,000 | $ 0 | $ 1,300,000
Abandonments | 1,095,000 | 853,000 | 1,646,000
Total impairments and abandonment charges | 2,963,000 | 853,000 | 2,903,000
West | Operating Segments |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Abandonments | 289,000 | 0 | 923,000
East | Operating Segments |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Abandonments | 143,000 | 465,000 | 82,000
Southeast | Operating Segments |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Abandonments | 663,000 | 388,000 | 641,000
Continuing Operations |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Land held for sale | 1,868,000 | 0 | 1,257,000
Continuing Operations | Corporate and unallocated |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Land held for sale | 565,000 | 0 | 1,160,000
Continuing Operations | West |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Land held for sale | 1,303,000 | 0 | 89,000
Continuing Operations | Southeast |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |
Land held for sale | $ 0 | $ 0 | $ 8,000

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