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Inventory - Narrative (Details) (USD $) | 12 Months Ended
--- | ---
Sep. 30, 2012 Communities homes | Sep. 30, 2011 Communities homes | Sep. 30, 2010 Communities
Real Estate Properties [Line Items] |  |  |
Number of subtantially completed homes not subject to a sales contract | 174 | 334 |
Total value of substantially completed homes | $ 39,700,000 | $ 59,300,000 |
Owned inventory | 1,099,132,000 | 1,192,380,000 |
Number of communities impaired | 5 | 19 | 29
Deposits and non-refundable preacquisition costs incurred | 24,923,000 | 20,097,000 |
Total remaining purchase price committed under all options | 198,498,000 | 225,230,000 |
Minimum |  |  |
Real Estate Properties [Line Items] |  |  |
Discount rate | 11.20% | 12.60% |
Maximum |  |  |
Real Estate Properties [Line Items] |  |  |
Discount rate | 17.00% | 18.20% |
CALIFORNIA |  |  |
Real Estate Properties [Line Items] |  |  |
Owned inventory | $ 350,900,000 | $ 367,800,000 |

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- Definition The net carrying amount as of the balance sheet date of the sum of the various components of an operative builder's inventory, including finished homes. Operative builders primarily consist of entities that develop land, construct residential homes and commercial and industrial buildings thereon, and sell them to home buyers and operators of the commercial and industrial properties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.6(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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