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Inventory - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 USD ($) Community numberOfContract | Sep. 30, 2020 USD ($) home | Sep. 30, 2020 USD ($) home | Sep. 30, 2020 USD ($) home lot | Sep. 30, 2020 USD ($) home numberOfContract | Sep. 30, 2019 USD ($) Community home | Sep. 30, 2018 USD ($) Community
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Number of substantially completed homes not subject to a sales contract | home |  | 133 | 133 | 133 | 133 | 238 |
Total value of substantially completed homes |  | $ 42,200 | $ 42,200 | $ 42,200 | $ 42,200 | $ 82,200 |
Threshold number of homes below a minimum threshold of profitability |  | 10 |  | 10 |  |  |
Impairment of land held for sale | $ 38,600 |  | 1,300 |  |  | 38,600 | $ 5,900
Abandonments |  |  | 1,646 |  |  | 0 | 0
Number of terminated land contracts under acquisition | numberOfContract |  |  |  |  | 6 |  |
Impairment Charge | $ 109,000 |  | 1,700 |  |  | 131,700 | 4,200
Number of impaired communities in projects in progress | numberOfContract | 9 |  |  |  |  |  |
Number of impaired communities, classified as land held for development | numberOfContract | 6 |  |  |  |  |  |
Number of impaired communities in projects in progress | Community | 9 |  |  |  |  |  |
California |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Number of communities impaired | Community | 15 |  |  |  |  |  |
Impairment Charge | $ 147,600 |  |  |  |  |  |
Continuing Operations |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Impairment of land held for sale |  |  | 1,257 |  |  | 38,588 | 5,494
Abandonments |  |  | 2,903 |  |  | $ 148,618 | $ 6,499
Number of communities impaired | Community |  |  |  |  |  | 10 | 1
Impairment Charge |  |  |  |  |  | $ 110,030 | $ 1,005
Discontinued Operations |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Impairment of land held for sale |  |  | 0 |  |  | 0 | 450
West | Operating Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Abandonments |  |  | 923 |  |  | 0 | 0
West | Continuing Operations |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Impairment of land held for sale |  |  | 89 |  |  | $ 37,963 | 0
West | Continuing Operations | Operating Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Number of communities impaired | Community |  |  |  |  |  | 9 |
Impairment Charge |  |  |  |  |  | $ 92,912 |
East | Operating Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Abandonments |  |  | 82 |  |  | 0 | 0
East | Continuing Operations |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Impairment of land held for sale |  |  | 0 |  |  | 0 | 168
Southeast | Operating Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Abandonments |  |  | 641 |  |  | 0 | 0
Southeast | Continuing Operations |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Impairment of land held for sale |  |  | $ 8 |  |  | $ 0 | $ 3,218
Southeast | Continuing Operations | Operating Segments |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Number of communities impaired | Community |  |  |  |  |  | 1 | 1
Impairment Charge |  |  |  |  |  | $ 858 | $ 793
East And Southeast Segment [Member] |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |
Impairment of land held for sale |  |  |  |  |  |  | $ 5,500

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