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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 | 12 Months Ended
--- | --- | ---
Sep. 30, 2012 Communities | Sep. 30, 2011 Communities | Sep. 30, 2010 Communities
Real Estate Properties [Line Items] |  |  |
Number of Communities on Watch List | 31 | 30 | 43
Undiscounted Cash Flow Analysis - Number of Communities | 19 | 23 | 40
Undiscounted Cash Flow Analysis - Pre-analysis Book Value (BV) | $ 72,959 | $ 96,008 | $ 161,929
Undiscounted Cash Flow Analysis - Aggregate Undiscounted Cash Flow as a % of BV | 96.70% | 87.40% | 87.70%
Unallocated |  |  |
Real Estate Properties [Line Items] |  |  |
Number of Communities on Watch List | 0 | 1 | 0
Undiscounted Cash Flow Analysis - Number of Communities | 0 | 0 | 0
Undiscounted Cash Flow Analysis - Pre-analysis Book Value (BV) | 5,193 | 9,707 | 13,728
Undiscounted Cash Flow Analysis - Aggregate Undiscounted Cash Flow as a % of BV | 100.00% | 100.00% | 100.00%
Continuing Operations | West |  |  |
Real Estate Properties [Line Items] |  |  |
Number of Communities on Watch List | 14 | 18 | 20
Undiscounted Cash Flow Analysis - Number of Communities | 8 | 15 | 20
Undiscounted Cash Flow Analysis - Pre-analysis Book Value (BV) | 28,467 | 58,848 | 80,270
Undiscounted Cash Flow Analysis - Aggregate Undiscounted Cash Flow as a % of BV | 94.70% | 88.40% | 90.80%
Continuing Operations | East |  |  |
Real Estate Properties [Line Items] |  |  |
Number of Communities on Watch List | 12 | 7 | 12
Undiscounted Cash Flow Analysis - Number of Communities | 8 | 5 | 10
Undiscounted Cash Flow Analysis - Pre-analysis Book Value (BV) | 30,052 | 16,436 | 43,655
Undiscounted Cash Flow Analysis - Aggregate Undiscounted Cash Flow as a % of BV | 91.80% | 94.60% | 79.70%
Continuing Operations | Southeast |  |  |
Real Estate Properties [Line Items] |  |  |
Number of Communities on Watch List | 5 | 4 | 6
Undiscounted Cash Flow Analysis - Number of Communities | 3 | 3 | 5
Undiscounted Cash Flow Analysis - Pre-analysis Book Value (BV) | 9,247 | 11,017 | 16,394
Undiscounted Cash Flow Analysis - Aggregate Undiscounted Cash Flow as a % of BV | 116.50% | 60.30% | 80.80%
Discontinued Operations |  |  |
Real Estate Properties [Line Items] |  |  |
Number of Communities on Watch List |  |  | 5
Undiscounted Cash Flow Analysis - Number of Communities |  |  | 5
Undiscounted Cash Flow Analysis - Pre-analysis Book Value (BV) |  |  | $ 7,882
Undiscounted Cash Flow Analysis - Aggregate Undiscounted Cash Flow as a % of BV |  |  | 93.80%

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