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Inventory - Recoverability Schedule of Inventory assets Held for Development, by Reportable Segment (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2018 USD ($) home Community | Sep. 30, 2018 USD ($) lot Community | Sep. 30, 2017 USD ($) Community
Real Estate Properties [Line Items] |  |  |
Number of Communities on Watch List | 4 | 4 | 6
Number of Communities | 2 | 2 | 2
Pre-analysis Book Value (BV) | $ | $ 5,667 | $ 5,667 | $ 19,138
Threshold number of homes below a minimum threshold of profitability | 10 | 10 |
Corporate and unallocated |  |  |
Real Estate Properties [Line Items] |  |  |
Number of Communities on Watch List | 0 | 0 | 0
Number of Communities | 0 | 0 | 0
Pre-analysis Book Value (BV) | $ | $ 1,307 | $ 1,307 | $ 3,337
West |  |  |
Real Estate Properties [Line Items] |  |  |
Number of Communities on Watch List | 2 | 2 | 4
Number of Communities | 0 | 0 | 2
Pre-analysis Book Value (BV) | $ | $ 0 | $ 0 | $ 15,801
Aggregate Undiscounted Cash Flow as a % of BV | 0.00% | 0.00% | 94.40%
Southeast |  |  |
Real Estate Properties [Line Items] |  |  |
Number of Communities on Watch List | 2 | 2 | 2
Number of Communities | 2 | 2 | 0
Pre-analysis Book Value (BV) | $ | $ 4,360 | $ 4,360 | $ 0
Aggregate Undiscounted Cash Flow as a % of BV | 99.00% | 99.00% | 0.00%

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