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Inventory - Recoverability Schedule of Inventory assets Held for Development, by Reportable Segment (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Dec. 31, 2012 Community | Dec. 31, 2011 Community
Real Estate Properties [Line Items] |  |
Number of Communities on Watch List | 4 | 13
Undiscounted Cash Flow Analysis - Number of Communities | 4 | 5
Undiscounted Cash Flow Analysis - Pre-analysis Book Value (BV) | $ 15,597 | $ 19,298
Undiscounted Cash Flow Analysis - Aggregate Undiscounted Cash Flow as a % of BV | 114.00% | 97.40%
West Segment |  |
Real Estate Properties [Line Items] |  |
Number of Communities on Watch List | 0 | 7
Undiscounted Cash Flow Analysis - Number of Communities | 0 | 4
Undiscounted Cash Flow Analysis - Pre-analysis Book Value (BV) | 0 | 15,543
Undiscounted Cash Flow Analysis - Aggregate Undiscounted Cash Flow as a % of BV |  | 96.70%
East Segment |  |
Real Estate Properties [Line Items] |  |
Number of Communities on Watch List | 3 | 4
Undiscounted Cash Flow Analysis - Number of Communities | 3 | 1
Undiscounted Cash Flow Analysis - Pre-analysis Book Value (BV) | 9,588 | 1,711
Undiscounted Cash Flow Analysis - Aggregate Undiscounted Cash Flow as a % of BV | 107.00% | 100.80%
Southeast Segment |  |
Real Estate Properties [Line Items] |  |
Number of Communities on Watch List | 1 | 2
Undiscounted Cash Flow Analysis - Number of Communities | 1 | 0
Undiscounted Cash Flow Analysis - Pre-analysis Book Value (BV) | 5,257 | 0
Undiscounted Cash Flow Analysis - Aggregate Undiscounted Cash Flow as a % of BV | 128.60% |
Unallocated & Other |  |
Real Estate Properties [Line Items] |  |
Number of Communities on Watch List | 0 | 0
Undiscounted Cash Flow Analysis - Number of Communities | 0 | 0
Undiscounted Cash Flow Analysis - Pre-analysis Book Value (BV) | $ 752 | $ 2,044

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