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Owned Inventory - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) contract community | Sep. 30, 2021 USD ($) home | Sep. 30, 2020 USD ($) home | Sep. 30, 2019 USD ($) community
Segment Reporting Information [Line Items] |  |  |  |
Number of homes under construction | home |  | 2,912 | 2,562 |
Number of homes under construction, spec homes | home |  | 576 | 649 |
Total, spec homes |  | $ 116,400 | $ 135,700 |
Number of homes under construction, in-process spec homes | home |  | 542 | 516 |
In-process spec homes |  | $ 105,200 | $ 93,500 |
Number of homes under construction, finished spec homes | home |  | 34 | 133 |
Finished spec homes |  | $ 11,200 | $ 42,200 |
Threshold number of homes below a minimum threshold of profitability | home |  | 10 |  |
Impairment Charge | $ 109,000 | $ 900 | 1,700 | $ 131,700
Number of impaired communities in projects in progress | contract | 9 |  |  |
Number of impaired communities, classified as land held for development | contract | 6 |  |  |
Number of impaired communities in projects in progress | contract | 9 |  |  |
Land held for sale | $ 38,600 | 0 | 1,300 | 38,600
Abandonments |  | 853 | 1,646 | $ 0
Continuing Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of communities impaired | community |  |  |  | 10
Impairment Charge |  |  |  | $ 110,030
Land held for sale |  | 0 | 1,257 | 38,588
California |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of communities impaired | contract | 15 |  |  |
Impairment Charge | $ 147,600 |  |  |
West |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of impaired communities, classified as land held for sale | community | 6 |  |  |
West | Continuing Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Land held for sale |  | 0 | 89 | 37,963
West | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Abandonments |  | 0 | 923 | $ 0
West | Operating Segments | Continuing Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of communities impaired | community |  |  |  | 9
Impairment Charge |  |  |  | $ 92,912
East | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Abandonments |  | 465 | 82 | 0
Southeast | Continuing Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Land held for sale |  | 0 | 8 | 0
Southeast | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Abandonments |  | $ 388 | $ 641 | $ 0
Southeast | Operating Segments | Continuing Operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Number of communities impaired | community |  |  |  | 1
Impairment Charge |  |  |  | $ 858

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