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Inventory - Inventory Impairments and Lot Option Abandonment Charges, by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Land Held for Sale | $ 38,600 | $ 1,300 | $ 38,600 | $ 5,900
Abandonments |  | 1,646 | 0 | 0
Total impairments and abandonments |  | 2,903 | 148,618 | 6,949
West | Operating Segments |  |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Abandonments |  | 923 | 0 | 0
East | Operating Segments |  |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Abandonments |  | 82 | 0 | 0
Southeast | Operating Segments |  |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Abandonments |  | 641 | 0 | 0
Continuing Operations |  |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Projects in progress |  | 0 | 110,030 | 1,005
Land Held for Sale |  | 1,257 | 38,588 | 5,494
Abandonments |  | 2,903 | 148,618 | 6,499
Continuing Operations | Corporate and unallocated |  |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Projects in progress |  | 0 | 16,260 | 212
Land Held for Sale |  | 1,160 | 625 | 2,108
Continuing Operations | West |  |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Projects in progress |  | 0 | 92,912 | 0
Land Held for Sale |  | 89 | 37,963 | 0
Continuing Operations | East |  |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Land Held for Sale |  | 0 | 0 | 168
Continuing Operations | Southeast |  |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Projects in progress |  | 0 | 858 | 793
Land Held for Sale |  | 8 | 0 | 3,218
Discontinued Operations |  |  |  |
Real Estate, Write-down or Reserve [Line Items] |  |  |  |
Land Held for Sale |  | 0 | 0 | 450
Total impairments and abandonments |  | $ 0 | $ 0 | $ 450

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